Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_MM_H |
2 | #define _LINUX_MM_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/errno.h> |
5 | ||
6 | #ifdef __KERNEL__ | |
7 | ||
309381fe | 8 | #include <linux/mmdebug.h> |
1da177e4 | 9 | #include <linux/gfp.h> |
187f1882 | 10 | #include <linux/bug.h> |
1da177e4 LT |
11 | #include <linux/list.h> |
12 | #include <linux/mmzone.h> | |
13 | #include <linux/rbtree.h> | |
83aeeada | 14 | #include <linux/atomic.h> |
9a11b49a | 15 | #include <linux/debug_locks.h> |
5b99cd0e | 16 | #include <linux/mm_types.h> |
08677214 | 17 | #include <linux/range.h> |
c6f6b596 | 18 | #include <linux/pfn.h> |
3565fce3 | 19 | #include <linux/percpu-refcount.h> |
e9da73d6 | 20 | #include <linux/bit_spinlock.h> |
b0d40c92 | 21 | #include <linux/shrinker.h> |
9c599024 | 22 | #include <linux/resource.h> |
e30825f1 | 23 | #include <linux/page_ext.h> |
8025e5dd | 24 | #include <linux/err.h> |
1da177e4 LT |
25 | |
26 | struct mempolicy; | |
27 | struct anon_vma; | |
bf181b9f | 28 | struct anon_vma_chain; |
4e950f6f | 29 | struct file_ra_state; |
e8edc6e0 | 30 | struct user_struct; |
4e950f6f | 31 | struct writeback_control; |
682aa8e1 | 32 | struct bdi_writeback; |
1da177e4 | 33 | |
fccc9987 | 34 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 35 | extern unsigned long max_mapnr; |
fccc9987 JL |
36 | |
37 | static inline void set_max_mapnr(unsigned long limit) | |
38 | { | |
39 | max_mapnr = limit; | |
40 | } | |
41 | #else | |
42 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
43 | #endif |
44 | ||
4481374c | 45 | extern unsigned long totalram_pages; |
1da177e4 | 46 | extern void * high_memory; |
1da177e4 LT |
47 | extern int page_cluster; |
48 | ||
49 | #ifdef CONFIG_SYSCTL | |
50 | extern int sysctl_legacy_va_layout; | |
51 | #else | |
52 | #define sysctl_legacy_va_layout 0 | |
53 | #endif | |
54 | ||
d07e2259 DC |
55 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
56 | extern const int mmap_rnd_bits_min; | |
57 | extern const int mmap_rnd_bits_max; | |
58 | extern int mmap_rnd_bits __read_mostly; | |
59 | #endif | |
60 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
61 | extern const int mmap_rnd_compat_bits_min; | |
62 | extern const int mmap_rnd_compat_bits_max; | |
63 | extern int mmap_rnd_compat_bits __read_mostly; | |
64 | #endif | |
65 | ||
1da177e4 LT |
66 | #include <asm/page.h> |
67 | #include <asm/pgtable.h> | |
68 | #include <asm/processor.h> | |
1da177e4 | 69 | |
79442ed1 TC |
70 | #ifndef __pa_symbol |
71 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
72 | #endif | |
73 | ||
593befa6 DD |
74 | /* |
75 | * To prevent common memory management code establishing | |
76 | * a zero page mapping on a read fault. | |
77 | * This macro should be defined within <asm/pgtable.h>. | |
78 | * s390 does this to prevent multiplexing of hardware bits | |
79 | * related to the physical page in case of virtualization. | |
80 | */ | |
81 | #ifndef mm_forbids_zeropage | |
82 | #define mm_forbids_zeropage(X) (0) | |
83 | #endif | |
84 | ||
ea606cf5 AR |
85 | /* |
86 | * Default maximum number of active map areas, this limits the number of vmas | |
87 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
88 | * problem. | |
89 | * | |
90 | * When a program's coredump is generated as ELF format, a section is created | |
91 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
92 | * This means the number of sections should be smaller than 65535 at coredump. | |
93 | * Because the kernel adds some informative sections to a image of program at | |
94 | * generating coredump, we need some margin. The number of extra sections is | |
95 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
96 | * | |
97 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
98 | * not a hard limit any more. Although some userspace tools can be surprised by | |
99 | * that. | |
100 | */ | |
101 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
102 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
103 | ||
104 | extern int sysctl_max_map_count; | |
105 | ||
c9b1d098 | 106 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 107 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 108 | |
49f0ce5f JM |
109 | extern int sysctl_overcommit_memory; |
110 | extern int sysctl_overcommit_ratio; | |
111 | extern unsigned long sysctl_overcommit_kbytes; | |
112 | ||
113 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
114 | size_t *, loff_t *); | |
115 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
116 | size_t *, loff_t *); | |
117 | ||
1da177e4 LT |
118 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
119 | ||
27ac792c AR |
120 | /* to align the pointer to the (next) page boundary */ |
121 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
122 | ||
0fa73b86 AM |
123 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
124 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) | |
125 | ||
1da177e4 LT |
126 | /* |
127 | * Linux kernel virtual memory manager primitives. | |
128 | * The idea being to have a "virtual" mm in the same way | |
129 | * we have a virtual fs - giving a cleaner interface to the | |
130 | * mm details, and allowing different kinds of memory mappings | |
131 | * (from shared memory to executable loading to arbitrary | |
132 | * mmap() functions). | |
133 | */ | |
134 | ||
c43692e8 CL |
135 | extern struct kmem_cache *vm_area_cachep; |
136 | ||
1da177e4 | 137 | #ifndef CONFIG_MMU |
8feae131 DH |
138 | extern struct rb_root nommu_region_tree; |
139 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
140 | |
141 | extern unsigned int kobjsize(const void *objp); | |
142 | #endif | |
143 | ||
144 | /* | |
605d9288 | 145 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 146 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 147 | */ |
cc2383ec KK |
148 | #define VM_NONE 0x00000000 |
149 | ||
1da177e4 LT |
150 | #define VM_READ 0x00000001 /* currently active flags */ |
151 | #define VM_WRITE 0x00000002 | |
152 | #define VM_EXEC 0x00000004 | |
153 | #define VM_SHARED 0x00000008 | |
154 | ||
7e2cff42 | 155 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
156 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
157 | #define VM_MAYWRITE 0x00000020 | |
158 | #define VM_MAYEXEC 0x00000040 | |
159 | #define VM_MAYSHARE 0x00000080 | |
160 | ||
161 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 162 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 163 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 | 164 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
16ba6f81 | 165 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 166 | |
1da177e4 LT |
167 | #define VM_LOCKED 0x00002000 |
168 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
169 | ||
170 | /* Used by sys_madvise() */ | |
171 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
172 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
173 | ||
174 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
175 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 176 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 177 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 178 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 179 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
cc2383ec | 180 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
4aae7e43 | 181 | #define VM_ARCH_2 0x02000000 |
0103bd16 | 182 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 183 | |
d9104d1c CG |
184 | #ifdef CONFIG_MEM_SOFT_DIRTY |
185 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
186 | #else | |
187 | # define VM_SOFTDIRTY 0 | |
188 | #endif | |
189 | ||
b379d790 | 190 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
191 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
192 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 193 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 194 | |
cc2383ec KK |
195 | #if defined(CONFIG_X86) |
196 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
197 | #elif defined(CONFIG_PPC) | |
198 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
199 | #elif defined(CONFIG_PARISC) | |
200 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
201 | #elif defined(CONFIG_METAG) |
202 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
203 | #elif defined(CONFIG_IA64) |
204 | # define VM_GROWSUP VM_ARCH_1 | |
205 | #elif !defined(CONFIG_MMU) | |
206 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
207 | #endif | |
208 | ||
4aae7e43 QR |
209 | #if defined(CONFIG_X86) |
210 | /* MPX specific bounds table or bounds directory */ | |
211 | # define VM_MPX VM_ARCH_2 | |
212 | #endif | |
213 | ||
cc2383ec KK |
214 | #ifndef VM_GROWSUP |
215 | # define VM_GROWSUP VM_NONE | |
216 | #endif | |
217 | ||
a8bef8ff MG |
218 | /* Bits set in the VMA until the stack is in its final location */ |
219 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
220 | ||
1da177e4 LT |
221 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
222 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
223 | #endif | |
224 | ||
225 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 226 | #define VM_STACK VM_GROWSUP |
1da177e4 | 227 | #else |
30bdbb78 | 228 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
229 | #endif |
230 | ||
30bdbb78 KK |
231 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
232 | ||
b291f000 | 233 | /* |
78f11a25 AA |
234 | * Special vmas that are non-mergable, non-mlock()able. |
235 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 236 | */ |
9050d7eb | 237 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 238 | |
a0715cc2 AT |
239 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
240 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
241 | ||
de60f5f1 EM |
242 | /* This mask is used to clear all the VMA flags used by mlock */ |
243 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
244 | ||
1da177e4 LT |
245 | /* |
246 | * mapping from the currently active vm_flags protection bits (the | |
247 | * low four bits) to a page protection mask.. | |
248 | */ | |
249 | extern pgprot_t protection_map[16]; | |
250 | ||
d0217ac0 | 251 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
9b4bdd2f KS |
252 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
253 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ | |
254 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ | |
255 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ | |
256 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ | |
257 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ | |
d0217ac0 | 258 | |
54cb8821 | 259 | /* |
d0217ac0 | 260 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
261 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
262 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 263 | * |
c20cd45e MH |
264 | * MM layer fills up gfp_mask for page allocations but fault handler might |
265 | * alter it if its implementation requires a different allocation context. | |
266 | * | |
9b4bdd2f | 267 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 268 | */ |
d0217ac0 NP |
269 | struct vm_fault { |
270 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
c20cd45e | 271 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
d0217ac0 NP |
272 | pgoff_t pgoff; /* Logical page offset based on vma */ |
273 | void __user *virtual_address; /* Faulting virtual address */ | |
274 | ||
2e4cdab0 | 275 | struct page *cow_page; /* Handler may choose to COW */ |
d0217ac0 | 276 | struct page *page; /* ->fault handlers should return a |
83c54070 | 277 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 278 | * is set (which is also implied by |
83c54070 | 279 | * VM_FAULT_ERROR). |
d0217ac0 | 280 | */ |
8c6e50b0 KS |
281 | /* for ->map_pages() only */ |
282 | pgoff_t max_pgoff; /* map pages for offset from pgoff till | |
283 | * max_pgoff inclusive */ | |
284 | pte_t *pte; /* pte entry associated with ->pgoff */ | |
54cb8821 | 285 | }; |
1da177e4 LT |
286 | |
287 | /* | |
288 | * These are the virtual MM functions - opening of an area, closing and | |
289 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
290 | * to the functions called when a no-page or a wp-page exception occurs. | |
291 | */ | |
292 | struct vm_operations_struct { | |
293 | void (*open)(struct vm_area_struct * area); | |
294 | void (*close)(struct vm_area_struct * area); | |
5477e70a | 295 | int (*mremap)(struct vm_area_struct * area); |
d0217ac0 | 296 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
b96375f7 MW |
297 | int (*pmd_fault)(struct vm_area_struct *, unsigned long address, |
298 | pmd_t *, unsigned int flags); | |
8c6e50b0 | 299 | void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
300 | |
301 | /* notification that a previously read-only page is about to become | |
302 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 303 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 | 304 | |
dd906184 BH |
305 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
306 | int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); | |
307 | ||
28b2ee20 RR |
308 | /* called by access_process_vm when get_user_pages() fails, typically |
309 | * for use by special VMAs that can switch between memory and hardware | |
310 | */ | |
311 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
312 | void *buf, int len, int write); | |
78d683e8 AL |
313 | |
314 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
315 | * has a special name. Returning non-NULL will also cause this | |
316 | * vma to be dumped unconditionally. */ | |
317 | const char *(*name)(struct vm_area_struct *vma); | |
318 | ||
1da177e4 | 319 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
320 | /* |
321 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
322 | * to hold the policy upon return. Caller should pass NULL @new to | |
323 | * remove a policy and fall back to surrounding context--i.e. do not | |
324 | * install a MPOL_DEFAULT policy, nor the task or system default | |
325 | * mempolicy. | |
326 | */ | |
1da177e4 | 327 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
328 | |
329 | /* | |
330 | * get_policy() op must add reference [mpol_get()] to any policy at | |
331 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
332 | * in mm/mempolicy.c will do this automatically. | |
333 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
334 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
335 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
336 | * must return NULL--i.e., do not "fallback" to task or system default | |
337 | * policy. | |
338 | */ | |
1da177e4 LT |
339 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
340 | unsigned long addr); | |
341 | #endif | |
667a0a06 DV |
342 | /* |
343 | * Called by vm_normal_page() for special PTEs to find the | |
344 | * page for @addr. This is useful if the default behavior | |
345 | * (using pte_page()) would not find the correct page. | |
346 | */ | |
347 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
348 | unsigned long addr); | |
1da177e4 LT |
349 | }; |
350 | ||
351 | struct mmu_gather; | |
352 | struct inode; | |
353 | ||
349aef0b AM |
354 | #define page_private(page) ((page)->private) |
355 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 356 | |
5c7fb56e DW |
357 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
358 | static inline int pmd_devmap(pmd_t pmd) | |
359 | { | |
360 | return 0; | |
361 | } | |
362 | #endif | |
363 | ||
1da177e4 LT |
364 | /* |
365 | * FIXME: take this include out, include page-flags.h in | |
366 | * files which need it (119 of them) | |
367 | */ | |
368 | #include <linux/page-flags.h> | |
71e3aac0 | 369 | #include <linux/huge_mm.h> |
1da177e4 LT |
370 | |
371 | /* | |
372 | * Methods to modify the page usage count. | |
373 | * | |
374 | * What counts for a page usage: | |
375 | * - cache mapping (page->mapping) | |
376 | * - private data (page->private) | |
377 | * - page mapped in a task's page tables, each mapping | |
378 | * is counted separately | |
379 | * | |
380 | * Also, many kernel routines increase the page count before a critical | |
381 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
382 | */ |
383 | ||
384 | /* | |
da6052f7 | 385 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 386 | */ |
7c8ee9a8 NP |
387 | static inline int put_page_testzero(struct page *page) |
388 | { | |
309381fe | 389 | VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page); |
8dc04efb | 390 | return atomic_dec_and_test(&page->_count); |
7c8ee9a8 | 391 | } |
1da177e4 LT |
392 | |
393 | /* | |
7c8ee9a8 NP |
394 | * Try to grab a ref unless the page has a refcount of zero, return false if |
395 | * that is the case. | |
8e0861fa AK |
396 | * This can be called when MMU is off so it must not access |
397 | * any of the virtual mappings. | |
1da177e4 | 398 | */ |
7c8ee9a8 NP |
399 | static inline int get_page_unless_zero(struct page *page) |
400 | { | |
8dc04efb | 401 | return atomic_inc_not_zero(&page->_count); |
7c8ee9a8 | 402 | } |
1da177e4 | 403 | |
53df8fdc | 404 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
405 | |
406 | enum { | |
407 | REGION_INTERSECTS, | |
408 | REGION_DISJOINT, | |
409 | REGION_MIXED, | |
410 | }; | |
411 | ||
1c29f25b TK |
412 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
413 | unsigned long desc); | |
53df8fdc | 414 | |
48667e7a | 415 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
416 | struct page *vmalloc_to_page(const void *addr); |
417 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 418 | |
0738c4bb PM |
419 | /* |
420 | * Determine if an address is within the vmalloc range | |
421 | * | |
422 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
423 | * is no special casing required. | |
424 | */ | |
9e2779fa CL |
425 | static inline int is_vmalloc_addr(const void *x) |
426 | { | |
0738c4bb | 427 | #ifdef CONFIG_MMU |
9e2779fa CL |
428 | unsigned long addr = (unsigned long)x; |
429 | ||
430 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
431 | #else |
432 | return 0; | |
8ca3ed87 | 433 | #endif |
0738c4bb | 434 | } |
81ac3ad9 KH |
435 | #ifdef CONFIG_MMU |
436 | extern int is_vmalloc_or_module_addr(const void *x); | |
437 | #else | |
934831d0 | 438 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
439 | { |
440 | return 0; | |
441 | } | |
442 | #endif | |
9e2779fa | 443 | |
39f1f78d AV |
444 | extern void kvfree(const void *addr); |
445 | ||
53f9263b KS |
446 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
447 | { | |
448 | return &page[1].compound_mapcount; | |
449 | } | |
450 | ||
451 | static inline int compound_mapcount(struct page *page) | |
452 | { | |
453 | if (!PageCompound(page)) | |
454 | return 0; | |
455 | page = compound_head(page); | |
456 | return atomic_read(compound_mapcount_ptr(page)) + 1; | |
457 | } | |
458 | ||
70b50f94 AA |
459 | /* |
460 | * The atomic page->_mapcount, starts from -1: so that transitions | |
461 | * both from it and to it can be tracked, using atomic_inc_and_test | |
462 | * and atomic_add_negative(-1). | |
463 | */ | |
22b751c3 | 464 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
465 | { |
466 | atomic_set(&(page)->_mapcount, -1); | |
467 | } | |
468 | ||
b20ce5e0 KS |
469 | int __page_mapcount(struct page *page); |
470 | ||
70b50f94 AA |
471 | static inline int page_mapcount(struct page *page) |
472 | { | |
1d148e21 | 473 | VM_BUG_ON_PAGE(PageSlab(page), page); |
53f9263b | 474 | |
b20ce5e0 KS |
475 | if (unlikely(PageCompound(page))) |
476 | return __page_mapcount(page); | |
477 | return atomic_read(&page->_mapcount) + 1; | |
478 | } | |
479 | ||
480 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
481 | int total_mapcount(struct page *page); | |
482 | #else | |
483 | static inline int total_mapcount(struct page *page) | |
484 | { | |
485 | return page_mapcount(page); | |
70b50f94 | 486 | } |
b20ce5e0 | 487 | #endif |
70b50f94 | 488 | |
4c21e2f2 | 489 | static inline int page_count(struct page *page) |
1da177e4 | 490 | { |
d85f3385 | 491 | return atomic_read(&compound_head(page)->_count); |
1da177e4 LT |
492 | } |
493 | ||
b49af68f CL |
494 | static inline struct page *virt_to_head_page(const void *x) |
495 | { | |
496 | struct page *page = virt_to_page(x); | |
ccaafd7f | 497 | |
1d798ca3 | 498 | return compound_head(page); |
b49af68f CL |
499 | } |
500 | ||
7835e98b NP |
501 | /* |
502 | * Setup the page count before being freed into the page allocator for | |
503 | * the first time (boot or memory hotplug) | |
504 | */ | |
505 | static inline void init_page_count(struct page *page) | |
506 | { | |
507 | atomic_set(&page->_count, 1); | |
508 | } | |
509 | ||
ddc58f27 KS |
510 | void __put_page(struct page *page); |
511 | ||
1d7ea732 | 512 | void put_pages_list(struct list_head *pages); |
1da177e4 | 513 | |
8dfcc9ba | 514 | void split_page(struct page *page, unsigned int order); |
748446bb | 515 | int split_free_page(struct page *page); |
8dfcc9ba | 516 | |
33f2ef89 AW |
517 | /* |
518 | * Compound pages have a destructor function. Provide a | |
519 | * prototype for that function and accessor functions. | |
f1e61557 | 520 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 521 | */ |
f1e61557 KS |
522 | typedef void compound_page_dtor(struct page *); |
523 | ||
524 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
525 | enum compound_dtor_id { | |
526 | NULL_COMPOUND_DTOR, | |
527 | COMPOUND_PAGE_DTOR, | |
528 | #ifdef CONFIG_HUGETLB_PAGE | |
529 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
530 | #endif |
531 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
532 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
533 | #endif |
534 | NR_COMPOUND_DTORS, | |
535 | }; | |
536 | extern compound_page_dtor * const compound_page_dtors[]; | |
33f2ef89 AW |
537 | |
538 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 539 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 540 | { |
f1e61557 KS |
541 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
542 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
543 | } |
544 | ||
545 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
546 | { | |
f1e61557 KS |
547 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
548 | return compound_page_dtors[page[1].compound_dtor]; | |
33f2ef89 AW |
549 | } |
550 | ||
d00181b9 | 551 | static inline unsigned int compound_order(struct page *page) |
d85f3385 | 552 | { |
6d777953 | 553 | if (!PageHead(page)) |
d85f3385 | 554 | return 0; |
e4b294c2 | 555 | return page[1].compound_order; |
d85f3385 CL |
556 | } |
557 | ||
f1e61557 | 558 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 559 | { |
e4b294c2 | 560 | page[1].compound_order = order; |
d85f3385 CL |
561 | } |
562 | ||
9a982250 KS |
563 | void free_compound_page(struct page *page); |
564 | ||
3dece370 | 565 | #ifdef CONFIG_MMU |
14fd403f AA |
566 | /* |
567 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
568 | * servicing faults for write access. In the normal case, do always want | |
569 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
570 | * that do not have writing enabled, when used by access_process_vm. | |
571 | */ | |
572 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
573 | { | |
574 | if (likely(vma->vm_flags & VM_WRITE)) | |
575 | pte = pte_mkwrite(pte); | |
576 | return pte; | |
577 | } | |
8c6e50b0 KS |
578 | |
579 | void do_set_pte(struct vm_area_struct *vma, unsigned long address, | |
580 | struct page *page, pte_t *pte, bool write, bool anon); | |
3dece370 | 581 | #endif |
14fd403f | 582 | |
1da177e4 LT |
583 | /* |
584 | * Multiple processes may "see" the same page. E.g. for untouched | |
585 | * mappings of /dev/null, all processes see the same page full of | |
586 | * zeroes, and text pages of executables and shared libraries have | |
587 | * only one copy in memory, at most, normally. | |
588 | * | |
589 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
590 | * page_count() == 0 means the page is free. page->lru is then used for |
591 | * freelist management in the buddy allocator. | |
da6052f7 | 592 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 593 | * |
da6052f7 NP |
594 | * Pages are allocated by the slab allocator in order to provide memory |
595 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
596 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
597 | * unless a particular usage is carefully commented. (the responsibility of | |
598 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 599 | * |
da6052f7 NP |
600 | * A page may be used by anyone else who does a __get_free_page(). |
601 | * In this case, page_count still tracks the references, and should only | |
602 | * be used through the normal accessor functions. The top bits of page->flags | |
603 | * and page->virtual store page management information, but all other fields | |
604 | * are unused and could be used privately, carefully. The management of this | |
605 | * page is the responsibility of the one who allocated it, and those who have | |
606 | * subsequently been given references to it. | |
607 | * | |
608 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
609 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
610 | * The following discussion applies only to them. | |
611 | * | |
da6052f7 NP |
612 | * A pagecache page contains an opaque `private' member, which belongs to the |
613 | * page's address_space. Usually, this is the address of a circular list of | |
614 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
615 | * into the filesystem to release these pages. | |
1da177e4 | 616 | * |
da6052f7 NP |
617 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
618 | * is the pointer to the inode, and page->index is the file offset of the page, | |
619 | * in units of PAGE_CACHE_SIZE. | |
1da177e4 | 620 | * |
da6052f7 NP |
621 | * If pagecache pages are not associated with an inode, they are said to be |
622 | * anonymous pages. These may become associated with the swapcache, and in that | |
623 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 624 | * |
da6052f7 NP |
625 | * In either case (swapcache or inode backed), the pagecache itself holds one |
626 | * reference to the page. Setting PG_private should also increment the | |
627 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 628 | * |
da6052f7 NP |
629 | * The pagecache pages are stored in a per-mapping radix tree, which is |
630 | * rooted at mapping->page_tree, and indexed by offset. | |
631 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
632 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 633 | * |
da6052f7 | 634 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
635 | * - inode pages may need to be read from disk, |
636 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
637 | * to be written back to the inode on disk, |
638 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
639 | * modified may need to be swapped out to swap space and (later) to be read | |
640 | * back into memory. | |
1da177e4 LT |
641 | */ |
642 | ||
643 | /* | |
644 | * The zone field is never updated after free_area_init_core() | |
645 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 646 | */ |
348f8b6c | 647 | |
90572890 | 648 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 649 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
650 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
651 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 652 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 653 | |
348f8b6c | 654 | /* |
25985edc | 655 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
656 | * sections we define the shift as 0; that plus a 0 mask ensures |
657 | * the compiler will optimise away reference to them. | |
658 | */ | |
d41dee36 AW |
659 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
660 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
661 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 662 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 663 | |
bce54bbf WD |
664 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
665 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 666 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
667 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
668 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 669 | #else |
89689ae7 | 670 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
671 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
672 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
673 | #endif |
674 | ||
bd8029b6 | 675 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 676 | |
9223b419 CL |
677 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
678 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
679 | #endif |
680 | ||
d41dee36 AW |
681 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
682 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
683 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 684 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 685 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 686 | |
33dd4e0e | 687 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 688 | { |
348f8b6c | 689 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 690 | } |
1da177e4 | 691 | |
260ae3f7 | 692 | #ifdef CONFIG_ZONE_DEVICE |
3565fce3 DW |
693 | void get_zone_device_page(struct page *page); |
694 | void put_zone_device_page(struct page *page); | |
260ae3f7 DW |
695 | static inline bool is_zone_device_page(const struct page *page) |
696 | { | |
697 | return page_zonenum(page) == ZONE_DEVICE; | |
698 | } | |
699 | #else | |
3565fce3 DW |
700 | static inline void get_zone_device_page(struct page *page) |
701 | { | |
702 | } | |
703 | static inline void put_zone_device_page(struct page *page) | |
704 | { | |
705 | } | |
260ae3f7 DW |
706 | static inline bool is_zone_device_page(const struct page *page) |
707 | { | |
708 | return false; | |
709 | } | |
710 | #endif | |
711 | ||
3565fce3 DW |
712 | static inline void get_page(struct page *page) |
713 | { | |
714 | page = compound_head(page); | |
715 | /* | |
716 | * Getting a normal page or the head of a compound page | |
717 | * requires to already have an elevated page->_count. | |
718 | */ | |
719 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); | |
720 | atomic_inc(&page->_count); | |
721 | ||
722 | if (unlikely(is_zone_device_page(page))) | |
723 | get_zone_device_page(page); | |
724 | } | |
725 | ||
726 | static inline void put_page(struct page *page) | |
727 | { | |
728 | page = compound_head(page); | |
729 | ||
730 | if (put_page_testzero(page)) | |
731 | __put_page(page); | |
732 | ||
733 | if (unlikely(is_zone_device_page(page))) | |
734 | put_zone_device_page(page); | |
735 | } | |
736 | ||
9127ab4f CS |
737 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
738 | #define SECTION_IN_PAGE_FLAGS | |
739 | #endif | |
740 | ||
89689ae7 | 741 | /* |
7a8010cd VB |
742 | * The identification function is mainly used by the buddy allocator for |
743 | * determining if two pages could be buddies. We are not really identifying | |
744 | * the zone since we could be using the section number id if we do not have | |
745 | * node id available in page flags. | |
746 | * We only guarantee that it will return the same value for two combinable | |
747 | * pages in a zone. | |
89689ae7 | 748 | */ |
cb2b95e1 AW |
749 | static inline int page_zone_id(struct page *page) |
750 | { | |
89689ae7 | 751 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
752 | } |
753 | ||
25ba77c1 | 754 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 755 | { |
d5f541ed CL |
756 | #ifdef CONFIG_NUMA |
757 | return zone->node; | |
758 | #else | |
759 | return 0; | |
760 | #endif | |
89fa3024 CL |
761 | } |
762 | ||
89689ae7 | 763 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 764 | extern int page_to_nid(const struct page *page); |
89689ae7 | 765 | #else |
33dd4e0e | 766 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 767 | { |
89689ae7 | 768 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 769 | } |
89689ae7 CL |
770 | #endif |
771 | ||
57e0a030 | 772 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 773 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 774 | { |
90572890 | 775 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
776 | } |
777 | ||
90572890 | 778 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 779 | { |
90572890 | 780 | return cpupid & LAST__PID_MASK; |
57e0a030 | 781 | } |
b795854b | 782 | |
90572890 | 783 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 784 | { |
90572890 | 785 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
786 | } |
787 | ||
90572890 | 788 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 789 | { |
90572890 | 790 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
791 | } |
792 | ||
90572890 | 793 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 794 | { |
90572890 | 795 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
796 | } |
797 | ||
90572890 | 798 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 799 | { |
90572890 | 800 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
801 | } |
802 | ||
8c8a743c PZ |
803 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
804 | { | |
805 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
806 | } | |
807 | ||
808 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
809 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
810 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 811 | { |
1ae71d03 | 812 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 813 | } |
90572890 PZ |
814 | |
815 | static inline int page_cpupid_last(struct page *page) | |
816 | { | |
817 | return page->_last_cpupid; | |
818 | } | |
819 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 820 | { |
1ae71d03 | 821 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
822 | } |
823 | #else | |
90572890 | 824 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 825 | { |
90572890 | 826 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
827 | } |
828 | ||
90572890 | 829 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 830 | |
90572890 | 831 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 832 | { |
90572890 | 833 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
4468b8f1 | 834 | |
90572890 PZ |
835 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
836 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; | |
75980e97 | 837 | } |
90572890 PZ |
838 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
839 | #else /* !CONFIG_NUMA_BALANCING */ | |
840 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 841 | { |
90572890 | 842 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
843 | } |
844 | ||
90572890 | 845 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 846 | { |
90572890 | 847 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
848 | } |
849 | ||
90572890 | 850 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
851 | { |
852 | return -1; | |
853 | } | |
854 | ||
90572890 | 855 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
856 | { |
857 | return -1; | |
858 | } | |
859 | ||
90572890 | 860 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
861 | { |
862 | return -1; | |
863 | } | |
864 | ||
90572890 PZ |
865 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
866 | { | |
867 | return -1; | |
868 | } | |
869 | ||
870 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
871 | { |
872 | return 1; | |
873 | } | |
874 | ||
90572890 | 875 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
876 | { |
877 | } | |
8c8a743c PZ |
878 | |
879 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
880 | { | |
881 | return false; | |
882 | } | |
90572890 | 883 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 884 | |
33dd4e0e | 885 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
886 | { |
887 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
888 | } | |
889 | ||
9127ab4f | 890 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
891 | static inline void set_page_section(struct page *page, unsigned long section) |
892 | { | |
893 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
894 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
895 | } | |
896 | ||
aa462abe | 897 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
898 | { |
899 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
900 | } | |
308c05e3 | 901 | #endif |
d41dee36 | 902 | |
2f1b6248 | 903 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
904 | { |
905 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
906 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
907 | } | |
2f1b6248 | 908 | |
348f8b6c DH |
909 | static inline void set_page_node(struct page *page, unsigned long node) |
910 | { | |
911 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
912 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 913 | } |
89689ae7 | 914 | |
2f1b6248 | 915 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 916 | unsigned long node, unsigned long pfn) |
1da177e4 | 917 | { |
348f8b6c DH |
918 | set_page_zone(page, zone); |
919 | set_page_node(page, node); | |
9127ab4f | 920 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 921 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 922 | #endif |
1da177e4 LT |
923 | } |
924 | ||
0610c25d GT |
925 | #ifdef CONFIG_MEMCG |
926 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
927 | { | |
928 | return page->mem_cgroup; | |
929 | } | |
0610c25d GT |
930 | #else |
931 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
932 | { | |
933 | return NULL; | |
934 | } | |
0610c25d GT |
935 | #endif |
936 | ||
f6ac2354 CL |
937 | /* |
938 | * Some inline functions in vmstat.h depend on page_zone() | |
939 | */ | |
940 | #include <linux/vmstat.h> | |
941 | ||
33dd4e0e | 942 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 943 | { |
aa462abe | 944 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
945 | } |
946 | ||
947 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
948 | #define HASHED_PAGE_VIRTUAL | |
949 | #endif | |
950 | ||
951 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
952 | static inline void *page_address(const struct page *page) |
953 | { | |
954 | return page->virtual; | |
955 | } | |
956 | static inline void set_page_address(struct page *page, void *address) | |
957 | { | |
958 | page->virtual = address; | |
959 | } | |
1da177e4 LT |
960 | #define page_address_init() do { } while(0) |
961 | #endif | |
962 | ||
963 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 964 | void *page_address(const struct page *page); |
1da177e4 LT |
965 | void set_page_address(struct page *page, void *virtual); |
966 | void page_address_init(void); | |
967 | #endif | |
968 | ||
969 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
970 | #define page_address(page) lowmem_page_address(page) | |
971 | #define set_page_address(page, address) do { } while(0) | |
972 | #define page_address_init() do { } while(0) | |
973 | #endif | |
974 | ||
e39155ea KS |
975 | extern void *page_rmapping(struct page *page); |
976 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 977 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 978 | |
f981c595 MG |
979 | extern struct address_space *__page_file_mapping(struct page *); |
980 | ||
981 | static inline | |
982 | struct address_space *page_file_mapping(struct page *page) | |
983 | { | |
984 | if (unlikely(PageSwapCache(page))) | |
985 | return __page_file_mapping(page); | |
986 | ||
987 | return page->mapping; | |
988 | } | |
989 | ||
1da177e4 LT |
990 | /* |
991 | * Return the pagecache index of the passed page. Regular pagecache pages | |
992 | * use ->index whereas swapcache pages use ->private | |
993 | */ | |
994 | static inline pgoff_t page_index(struct page *page) | |
995 | { | |
996 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 997 | return page_private(page); |
1da177e4 LT |
998 | return page->index; |
999 | } | |
1000 | ||
f981c595 MG |
1001 | extern pgoff_t __page_file_index(struct page *page); |
1002 | ||
1003 | /* | |
1004 | * Return the file index of the page. Regular pagecache pages use ->index | |
1005 | * whereas swapcache pages use swp_offset(->private) | |
1006 | */ | |
1007 | static inline pgoff_t page_file_index(struct page *page) | |
1008 | { | |
1009 | if (unlikely(PageSwapCache(page))) | |
1010 | return __page_file_index(page); | |
1011 | ||
1012 | return page->index; | |
1013 | } | |
1014 | ||
1da177e4 LT |
1015 | /* |
1016 | * Return true if this page is mapped into pagetables. | |
e1534ae9 | 1017 | * For compound page it returns true if any subpage of compound page is mapped. |
1da177e4 | 1018 | */ |
e1534ae9 | 1019 | static inline bool page_mapped(struct page *page) |
1da177e4 | 1020 | { |
e1534ae9 KS |
1021 | int i; |
1022 | if (likely(!PageCompound(page))) | |
1023 | return atomic_read(&page->_mapcount) >= 0; | |
1024 | page = compound_head(page); | |
1025 | if (atomic_read(compound_mapcount_ptr(page)) >= 0) | |
1026 | return true; | |
1027 | for (i = 0; i < hpage_nr_pages(page); i++) { | |
1028 | if (atomic_read(&page[i]._mapcount) >= 0) | |
1029 | return true; | |
1030 | } | |
1031 | return false; | |
1da177e4 LT |
1032 | } |
1033 | ||
2f064f34 MH |
1034 | /* |
1035 | * Return true only if the page has been allocated with | |
1036 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1037 | * met implying that the system is under some pressure. | |
1038 | */ | |
1039 | static inline bool page_is_pfmemalloc(struct page *page) | |
1040 | { | |
1041 | /* | |
1042 | * Page index cannot be this large so this must be | |
1043 | * a pfmemalloc page. | |
1044 | */ | |
1045 | return page->index == -1UL; | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Only to be called by the page allocator on a freshly allocated | |
1050 | * page. | |
1051 | */ | |
1052 | static inline void set_page_pfmemalloc(struct page *page) | |
1053 | { | |
1054 | page->index = -1UL; | |
1055 | } | |
1056 | ||
1057 | static inline void clear_page_pfmemalloc(struct page *page) | |
1058 | { | |
1059 | page->index = 0; | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1064 | * Used to decide whether a process gets delivered SIGBUS or | |
1065 | * just gets major/minor fault counters bumped up. | |
1066 | */ | |
d0217ac0 | 1067 | |
83c54070 | 1068 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
d0217ac0 | 1069 | |
83c54070 NP |
1070 | #define VM_FAULT_OOM 0x0001 |
1071 | #define VM_FAULT_SIGBUS 0x0002 | |
1072 | #define VM_FAULT_MAJOR 0x0004 | |
1073 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1074 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1075 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
33692f27 | 1076 | #define VM_FAULT_SIGSEGV 0x0040 |
f33ea7f4 | 1077 | |
83c54070 NP |
1078 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1079 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1080 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1081 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
1da177e4 | 1082 | |
aa50d3a7 AK |
1083 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
1084 | ||
33692f27 LT |
1085 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
1086 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ | |
1087 | VM_FAULT_FALLBACK) | |
aa50d3a7 AK |
1088 | |
1089 | /* Encode hstate index for a hwpoisoned large page */ | |
1090 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1091 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1092 | |
1c0fe6e3 NP |
1093 | /* |
1094 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1095 | */ | |
1096 | extern void pagefault_out_of_memory(void); | |
1097 | ||
1da177e4 LT |
1098 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1099 | ||
ddd588b5 | 1100 | /* |
7bf02ea2 | 1101 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1102 | * various contexts. |
1103 | */ | |
4b59e6c4 | 1104 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1105 | |
7bf02ea2 DR |
1106 | extern void show_free_areas(unsigned int flags); |
1107 | extern bool skip_free_areas_node(unsigned int flags, int nid); | |
1da177e4 | 1108 | |
1da177e4 | 1109 | int shmem_zero_setup(struct vm_area_struct *); |
0cd6144a JW |
1110 | #ifdef CONFIG_SHMEM |
1111 | bool shmem_mapping(struct address_space *mapping); | |
1112 | #else | |
1113 | static inline bool shmem_mapping(struct address_space *mapping) | |
1114 | { | |
1115 | return false; | |
1116 | } | |
1117 | #endif | |
1da177e4 | 1118 | |
7f43add4 | 1119 | extern bool can_do_mlock(void); |
1da177e4 LT |
1120 | extern int user_shm_lock(size_t, struct user_struct *); |
1121 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1122 | ||
1123 | /* | |
1124 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1125 | */ | |
1126 | struct zap_details { | |
1da177e4 LT |
1127 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1128 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1129 | pgoff_t last_index; /* Highest page->index to unmap */ | |
1da177e4 LT |
1130 | }; |
1131 | ||
7e675137 NP |
1132 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1133 | pte_t pte); | |
1134 | ||
c627f9cc JS |
1135 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1136 | unsigned long size); | |
14f5ff5d | 1137 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 1138 | unsigned long size, struct zap_details *); |
4f74d2c8 LT |
1139 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1140 | unsigned long start, unsigned long end); | |
e6473092 MM |
1141 | |
1142 | /** | |
1143 | * mm_walk - callbacks for walk_page_range | |
e6473092 | 1144 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
03319327 DH |
1145 | * this handler is required to be able to handle |
1146 | * pmd_trans_huge() pmds. They may simply choose to | |
1147 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1148 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1149 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1150 | * @hugetlb_entry: if set, called for each hugetlb entry |
fafaa426 NH |
1151 | * @test_walk: caller specific callback function to determine whether |
1152 | * we walk over the current vma or not. A positive returned | |
1153 | * value means "do page table walk over the current vma," | |
1154 | * and a negative one means "abort current page table walk | |
1155 | * right now." 0 means "skip the current vma." | |
1156 | * @mm: mm_struct representing the target process of page table walk | |
1157 | * @vma: vma currently walked (NULL if walking outside vmas) | |
1158 | * @private: private data for callbacks' usage | |
e6473092 | 1159 | * |
fafaa426 | 1160 | * (see the comment on walk_page_range() for more details) |
e6473092 MM |
1161 | */ |
1162 | struct mm_walk { | |
0f157a5b AM |
1163 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1164 | unsigned long next, struct mm_walk *walk); | |
1165 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1166 | unsigned long next, struct mm_walk *walk); | |
1167 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1168 | struct mm_walk *walk); | |
1169 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1170 | unsigned long addr, unsigned long next, | |
1171 | struct mm_walk *walk); | |
fafaa426 NH |
1172 | int (*test_walk)(unsigned long addr, unsigned long next, |
1173 | struct mm_walk *walk); | |
2165009b | 1174 | struct mm_struct *mm; |
fafaa426 | 1175 | struct vm_area_struct *vma; |
2165009b | 1176 | void *private; |
e6473092 MM |
1177 | }; |
1178 | ||
2165009b DH |
1179 | int walk_page_range(unsigned long addr, unsigned long end, |
1180 | struct mm_walk *walk); | |
900fc5f1 | 1181 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
42b77728 | 1182 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1183 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1184 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1185 | struct vm_area_struct *vma); | |
1da177e4 LT |
1186 | void unmap_mapping_range(struct address_space *mapping, |
1187 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
1188 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1189 | unsigned long *pfn); | |
d87fe660 | 1190 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1191 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1192 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1193 | void *buf, int len, int write); | |
1da177e4 LT |
1194 | |
1195 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1196 | loff_t const holebegin, loff_t const holelen) | |
1197 | { | |
1198 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1199 | } | |
1200 | ||
7caef267 | 1201 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1202 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1203 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1204 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1205 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1206 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1207 | int invalidate_inode_page(struct page *page); |
1208 | ||
7ee1dd3f | 1209 | #ifdef CONFIG_MMU |
83c54070 | 1210 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 1211 | unsigned long address, unsigned int flags); |
5c723ba5 | 1212 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
4a9e1cda DD |
1213 | unsigned long address, unsigned int fault_flags, |
1214 | bool *unlocked); | |
7ee1dd3f DH |
1215 | #else |
1216 | static inline int handle_mm_fault(struct mm_struct *mm, | |
1217 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 1218 | unsigned int flags) |
7ee1dd3f DH |
1219 | { |
1220 | /* should never happen if there's no MMU */ | |
1221 | BUG(); | |
1222 | return VM_FAULT_SIGBUS; | |
1223 | } | |
5c723ba5 PZ |
1224 | static inline int fixup_user_fault(struct task_struct *tsk, |
1225 | struct mm_struct *mm, unsigned long address, | |
4a9e1cda | 1226 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
1227 | { |
1228 | /* should never happen if there's no MMU */ | |
1229 | BUG(); | |
1230 | return -EFAULT; | |
1231 | } | |
7ee1dd3f | 1232 | #endif |
f33ea7f4 | 1233 | |
1da177e4 | 1234 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
5ddd36b9 SW |
1235 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1236 | void *buf, int len, int write); | |
1da177e4 | 1237 | |
28a35716 ML |
1238 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1239 | unsigned long start, unsigned long nr_pages, | |
1240 | unsigned int foll_flags, struct page **pages, | |
1241 | struct vm_area_struct **vmas, int *nonblocking); | |
1242 | long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, | |
1243 | unsigned long start, unsigned long nr_pages, | |
1244 | int write, int force, struct page **pages, | |
1245 | struct vm_area_struct **vmas); | |
f0818f47 AA |
1246 | long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, |
1247 | unsigned long start, unsigned long nr_pages, | |
1248 | int write, int force, struct page **pages, | |
1249 | int *locked); | |
0fd71a56 AA |
1250 | long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
1251 | unsigned long start, unsigned long nr_pages, | |
1252 | int write, int force, struct page **pages, | |
1253 | unsigned int gup_flags); | |
f0818f47 AA |
1254 | long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
1255 | unsigned long start, unsigned long nr_pages, | |
1256 | int write, int force, struct page **pages); | |
d2bf6be8 NP |
1257 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1258 | struct page **pages); | |
8025e5dd JK |
1259 | |
1260 | /* Container for pinned pfns / pages */ | |
1261 | struct frame_vector { | |
1262 | unsigned int nr_allocated; /* Number of frames we have space for */ | |
1263 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ | |
1264 | bool got_ref; /* Did we pin pages by getting page ref? */ | |
1265 | bool is_pfns; /* Does array contain pages or pfns? */ | |
1266 | void *ptrs[0]; /* Array of pinned pfns / pages. Use | |
1267 | * pfns_vector_pages() or pfns_vector_pfns() | |
1268 | * for access */ | |
1269 | }; | |
1270 | ||
1271 | struct frame_vector *frame_vector_create(unsigned int nr_frames); | |
1272 | void frame_vector_destroy(struct frame_vector *vec); | |
1273 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, | |
1274 | bool write, bool force, struct frame_vector *vec); | |
1275 | void put_vaddr_frames(struct frame_vector *vec); | |
1276 | int frame_vector_to_pages(struct frame_vector *vec); | |
1277 | void frame_vector_to_pfns(struct frame_vector *vec); | |
1278 | ||
1279 | static inline unsigned int frame_vector_count(struct frame_vector *vec) | |
1280 | { | |
1281 | return vec->nr_frames; | |
1282 | } | |
1283 | ||
1284 | static inline struct page **frame_vector_pages(struct frame_vector *vec) | |
1285 | { | |
1286 | if (vec->is_pfns) { | |
1287 | int err = frame_vector_to_pages(vec); | |
1288 | ||
1289 | if (err) | |
1290 | return ERR_PTR(err); | |
1291 | } | |
1292 | return (struct page **)(vec->ptrs); | |
1293 | } | |
1294 | ||
1295 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) | |
1296 | { | |
1297 | if (!vec->is_pfns) | |
1298 | frame_vector_to_pfns(vec); | |
1299 | return (unsigned long *)(vec->ptrs); | |
1300 | } | |
1301 | ||
18022c5d MG |
1302 | struct kvec; |
1303 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1304 | struct page **pages); | |
1305 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1306 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1307 | |
cf9a2ae8 | 1308 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1309 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1310 | unsigned int length); | |
cf9a2ae8 | 1311 | |
1da177e4 | 1312 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1313 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1314 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1315 | struct page *page); | |
62cccb8c | 1316 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
c4843a75 | 1317 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
62cccb8c | 1318 | struct bdi_writeback *wb); |
b3c97528 | 1319 | int set_page_dirty(struct page *page); |
1da177e4 | 1320 | int set_page_dirty_lock(struct page *page); |
11f81bec | 1321 | void cancel_dirty_page(struct page *page); |
1da177e4 | 1322 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1323 | |
a9090253 | 1324 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1325 | |
39aa3cb3 | 1326 | /* Is the vma a continuation of the stack vma above it? */ |
a09a79f6 | 1327 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
39aa3cb3 SB |
1328 | { |
1329 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
1330 | } | |
1331 | ||
b5330628 ON |
1332 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
1333 | { | |
1334 | return !vma->vm_ops; | |
1335 | } | |
1336 | ||
a09a79f6 MP |
1337 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1338 | unsigned long addr) | |
1339 | { | |
1340 | return (vma->vm_flags & VM_GROWSDOWN) && | |
1341 | (vma->vm_start == addr) && | |
1342 | !vma_growsdown(vma->vm_prev, addr); | |
1343 | } | |
1344 | ||
1345 | /* Is the vma a continuation of the stack vma below it? */ | |
1346 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) | |
1347 | { | |
1348 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); | |
1349 | } | |
1350 | ||
1351 | static inline int stack_guard_page_end(struct vm_area_struct *vma, | |
1352 | unsigned long addr) | |
1353 | { | |
1354 | return (vma->vm_flags & VM_GROWSUP) && | |
1355 | (vma->vm_end == addr) && | |
1356 | !vma_growsup(vma->vm_next, addr); | |
1357 | } | |
1358 | ||
65376df5 | 1359 | int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t); |
b7643757 | 1360 | |
b6a2fea3 OW |
1361 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1362 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1363 | unsigned long new_addr, unsigned long len, |
1364 | bool need_rmap_locks); | |
7da4d641 PZ |
1365 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1366 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1367 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1368 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1369 | struct vm_area_struct **pprev, unsigned long start, | |
1370 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1371 | |
465a454f PZ |
1372 | /* |
1373 | * doesn't attempt to fault and will return short. | |
1374 | */ | |
1375 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1376 | struct page **pages); | |
d559db08 KH |
1377 | /* |
1378 | * per-process(per-mm_struct) statistics. | |
1379 | */ | |
d559db08 KH |
1380 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1381 | { | |
69c97823 KK |
1382 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1383 | ||
1384 | #ifdef SPLIT_RSS_COUNTING | |
1385 | /* | |
1386 | * counter is updated in asynchronous manner and may go to minus. | |
1387 | * But it's never be expected number for users. | |
1388 | */ | |
1389 | if (val < 0) | |
1390 | val = 0; | |
172703b0 | 1391 | #endif |
69c97823 KK |
1392 | return (unsigned long)val; |
1393 | } | |
d559db08 KH |
1394 | |
1395 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1396 | { | |
172703b0 | 1397 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1398 | } |
1399 | ||
1400 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1401 | { | |
172703b0 | 1402 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1403 | } |
1404 | ||
1405 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1406 | { | |
172703b0 | 1407 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1408 | } |
1409 | ||
eca56ff9 JM |
1410 | /* Optimized variant when page is already known not to be PageAnon */ |
1411 | static inline int mm_counter_file(struct page *page) | |
1412 | { | |
1413 | if (PageSwapBacked(page)) | |
1414 | return MM_SHMEMPAGES; | |
1415 | return MM_FILEPAGES; | |
1416 | } | |
1417 | ||
1418 | static inline int mm_counter(struct page *page) | |
1419 | { | |
1420 | if (PageAnon(page)) | |
1421 | return MM_ANONPAGES; | |
1422 | return mm_counter_file(page); | |
1423 | } | |
1424 | ||
d559db08 KH |
1425 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1426 | { | |
1427 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
1428 | get_mm_counter(mm, MM_ANONPAGES) + |
1429 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
1430 | } |
1431 | ||
1432 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1433 | { | |
1434 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1435 | } | |
1436 | ||
1437 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1438 | { | |
1439 | return max(mm->hiwater_vm, mm->total_vm); | |
1440 | } | |
1441 | ||
1442 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1443 | { | |
1444 | unsigned long _rss = get_mm_rss(mm); | |
1445 | ||
1446 | if ((mm)->hiwater_rss < _rss) | |
1447 | (mm)->hiwater_rss = _rss; | |
1448 | } | |
1449 | ||
1450 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1451 | { | |
1452 | if (mm->hiwater_vm < mm->total_vm) | |
1453 | mm->hiwater_vm = mm->total_vm; | |
1454 | } | |
1455 | ||
695f0559 PC |
1456 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1457 | { | |
1458 | mm->hiwater_rss = get_mm_rss(mm); | |
1459 | } | |
1460 | ||
d559db08 KH |
1461 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1462 | struct mm_struct *mm) | |
1463 | { | |
1464 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1465 | ||
1466 | if (*maxrss < hiwater_rss) | |
1467 | *maxrss = hiwater_rss; | |
1468 | } | |
1469 | ||
53bddb4e | 1470 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1471 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1472 | #else |
05af2e10 | 1473 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1474 | { |
1475 | } | |
1476 | #endif | |
465a454f | 1477 | |
3565fce3 DW |
1478 | #ifndef __HAVE_ARCH_PTE_DEVMAP |
1479 | static inline int pte_devmap(pte_t pte) | |
1480 | { | |
1481 | return 0; | |
1482 | } | |
1483 | #endif | |
1484 | ||
4e950f6f | 1485 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1486 | |
25ca1d6c NK |
1487 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1488 | spinlock_t **ptl); | |
1489 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1490 | spinlock_t **ptl) | |
1491 | { | |
1492 | pte_t *ptep; | |
1493 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1494 | return ptep; | |
1495 | } | |
c9cfcddf | 1496 | |
5f22df00 NP |
1497 | #ifdef __PAGETABLE_PUD_FOLDED |
1498 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1499 | unsigned long address) | |
1500 | { | |
1501 | return 0; | |
1502 | } | |
1503 | #else | |
1bb3630e | 1504 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1505 | #endif |
1506 | ||
2d2f5119 | 1507 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
1508 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1509 | unsigned long address) | |
1510 | { | |
1511 | return 0; | |
1512 | } | |
dc6c9a35 | 1513 | |
2d2f5119 KS |
1514 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {} |
1515 | ||
dc6c9a35 KS |
1516 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1517 | { | |
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} | |
1522 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
1523 | ||
5f22df00 | 1524 | #else |
1bb3630e | 1525 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 1526 | |
2d2f5119 KS |
1527 | static inline void mm_nr_pmds_init(struct mm_struct *mm) |
1528 | { | |
1529 | atomic_long_set(&mm->nr_pmds, 0); | |
1530 | } | |
1531 | ||
dc6c9a35 KS |
1532 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1533 | { | |
1534 | return atomic_long_read(&mm->nr_pmds); | |
1535 | } | |
1536 | ||
1537 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) | |
1538 | { | |
1539 | atomic_long_inc(&mm->nr_pmds); | |
1540 | } | |
1541 | ||
1542 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
1543 | { | |
1544 | atomic_long_dec(&mm->nr_pmds); | |
1545 | } | |
5f22df00 NP |
1546 | #endif |
1547 | ||
8ac1f832 AA |
1548 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
1549 | pmd_t *pmd, unsigned long address); | |
1bb3630e HD |
1550 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1551 | ||
1da177e4 LT |
1552 | /* |
1553 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1554 | * Remove it when 4level-fixup.h has been removed. | |
1555 | */ | |
1bb3630e | 1556 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1557 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1558 | { | |
1bb3630e HD |
1559 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1560 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1564 | { | |
1bb3630e HD |
1565 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1566 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1567 | } |
1bb3630e HD |
1568 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1569 | ||
57c1ffce | 1570 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1571 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1572 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1573 | extern bool ptlock_alloc(struct page *page); |
1574 | extern void ptlock_free(struct page *page); | |
1575 | ||
1576 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1577 | { | |
1578 | return page->ptl; | |
1579 | } | |
597d795a | 1580 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1581 | static inline void ptlock_cache_init(void) |
1582 | { | |
1583 | } | |
1584 | ||
49076ec2 KS |
1585 | static inline bool ptlock_alloc(struct page *page) |
1586 | { | |
49076ec2 KS |
1587 | return true; |
1588 | } | |
539edb58 | 1589 | |
49076ec2 KS |
1590 | static inline void ptlock_free(struct page *page) |
1591 | { | |
49076ec2 KS |
1592 | } |
1593 | ||
1594 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1595 | { | |
539edb58 | 1596 | return &page->ptl; |
49076ec2 | 1597 | } |
597d795a | 1598 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1599 | |
1600 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1601 | { | |
1602 | return ptlock_ptr(pmd_page(*pmd)); | |
1603 | } | |
1604 | ||
1605 | static inline bool ptlock_init(struct page *page) | |
1606 | { | |
1607 | /* | |
1608 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1609 | * with 0. Make sure nobody took it in use in between. | |
1610 | * | |
1611 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 1612 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 1613 | */ |
309381fe | 1614 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1615 | if (!ptlock_alloc(page)) |
1616 | return false; | |
1617 | spin_lock_init(ptlock_ptr(page)); | |
1618 | return true; | |
1619 | } | |
1620 | ||
1621 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1622 | static inline void pte_lock_deinit(struct page *page) | |
1623 | { | |
1624 | page->mapping = NULL; | |
1625 | ptlock_free(page); | |
1626 | } | |
1627 | ||
57c1ffce | 1628 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1629 | /* |
1630 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1631 | */ | |
49076ec2 KS |
1632 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1633 | { | |
1634 | return &mm->page_table_lock; | |
1635 | } | |
b35f1819 | 1636 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1637 | static inline bool ptlock_init(struct page *page) { return true; } |
1638 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1639 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1640 | |
b35f1819 KS |
1641 | static inline void pgtable_init(void) |
1642 | { | |
1643 | ptlock_cache_init(); | |
1644 | pgtable_cache_init(); | |
1645 | } | |
1646 | ||
390f44e2 | 1647 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1648 | { |
706874e9 VD |
1649 | if (!ptlock_init(page)) |
1650 | return false; | |
2f569afd | 1651 | inc_zone_page_state(page, NR_PAGETABLE); |
706874e9 | 1652 | return true; |
2f569afd MS |
1653 | } |
1654 | ||
1655 | static inline void pgtable_page_dtor(struct page *page) | |
1656 | { | |
1657 | pte_lock_deinit(page); | |
1658 | dec_zone_page_state(page, NR_PAGETABLE); | |
1659 | } | |
1660 | ||
c74df32c HD |
1661 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1662 | ({ \ | |
4c21e2f2 | 1663 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1664 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1665 | *(ptlp) = __ptl; \ | |
1666 | spin_lock(__ptl); \ | |
1667 | __pte; \ | |
1668 | }) | |
1669 | ||
1670 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1671 | spin_unlock(ptl); \ | |
1672 | pte_unmap(pte); \ | |
1673 | } while (0) | |
1674 | ||
8ac1f832 AA |
1675 | #define pte_alloc_map(mm, vma, pmd, address) \ |
1676 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ | |
1677 | pmd, address))? \ | |
1678 | NULL: pte_offset_map(pmd, address)) | |
1bb3630e | 1679 | |
c74df32c | 1680 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
8ac1f832 AA |
1681 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ |
1682 | pmd, address))? \ | |
c74df32c HD |
1683 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
1684 | ||
1bb3630e | 1685 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1686 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1687 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1688 | |
e009bb30 KS |
1689 | #if USE_SPLIT_PMD_PTLOCKS |
1690 | ||
634391ac MS |
1691 | static struct page *pmd_to_page(pmd_t *pmd) |
1692 | { | |
1693 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1694 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1695 | } | |
1696 | ||
e009bb30 KS |
1697 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1698 | { | |
634391ac | 1699 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1700 | } |
1701 | ||
1702 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1703 | { | |
e009bb30 KS |
1704 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1705 | page->pmd_huge_pte = NULL; | |
1706 | #endif | |
49076ec2 | 1707 | return ptlock_init(page); |
e009bb30 KS |
1708 | } |
1709 | ||
1710 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1711 | { | |
1712 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1713 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1714 | #endif |
49076ec2 | 1715 | ptlock_free(page); |
e009bb30 KS |
1716 | } |
1717 | ||
634391ac | 1718 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1719 | |
1720 | #else | |
1721 | ||
9a86cb7b KS |
1722 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1723 | { | |
1724 | return &mm->page_table_lock; | |
1725 | } | |
1726 | ||
e009bb30 KS |
1727 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1728 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1729 | ||
c389a250 | 1730 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1731 | |
e009bb30 KS |
1732 | #endif |
1733 | ||
9a86cb7b KS |
1734 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1735 | { | |
1736 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1737 | spin_lock(ptl); | |
1738 | return ptl; | |
1739 | } | |
1740 | ||
1da177e4 | 1741 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1742 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1743 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1744 | extern void free_initmem(void); |
1745 | ||
69afade7 JL |
1746 | /* |
1747 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1748 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1749 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1750 | * Return pages freed into the buddy system. |
1751 | */ | |
11199692 | 1752 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1753 | int poison, char *s); |
c3d5f5f0 | 1754 | |
cfa11e08 JL |
1755 | #ifdef CONFIG_HIGHMEM |
1756 | /* | |
1757 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1758 | * and totalram_pages. | |
1759 | */ | |
1760 | extern void free_highmem_page(struct page *page); | |
1761 | #endif | |
69afade7 | 1762 | |
c3d5f5f0 | 1763 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1764 | extern void mem_init_print_info(const char *str); |
69afade7 | 1765 | |
92923ca3 NZ |
1766 | extern void reserve_bootmem_region(unsigned long start, unsigned long end); |
1767 | ||
69afade7 JL |
1768 | /* Free the reserved page into the buddy system, so it gets managed. */ |
1769 | static inline void __free_reserved_page(struct page *page) | |
1770 | { | |
1771 | ClearPageReserved(page); | |
1772 | init_page_count(page); | |
1773 | __free_page(page); | |
1774 | } | |
1775 | ||
1776 | static inline void free_reserved_page(struct page *page) | |
1777 | { | |
1778 | __free_reserved_page(page); | |
1779 | adjust_managed_page_count(page, 1); | |
1780 | } | |
1781 | ||
1782 | static inline void mark_page_reserved(struct page *page) | |
1783 | { | |
1784 | SetPageReserved(page); | |
1785 | adjust_managed_page_count(page, -1); | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
1790 | * The freed pages will be poisoned with pattern "poison" if it's within |
1791 | * range [0, UCHAR_MAX]. | |
1792 | * Return pages freed into the buddy system. | |
69afade7 JL |
1793 | */ |
1794 | static inline unsigned long free_initmem_default(int poison) | |
1795 | { | |
1796 | extern char __init_begin[], __init_end[]; | |
1797 | ||
11199692 | 1798 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
1799 | poison, "unused kernel"); |
1800 | } | |
1801 | ||
7ee3d4e8 JL |
1802 | static inline unsigned long get_num_physpages(void) |
1803 | { | |
1804 | int nid; | |
1805 | unsigned long phys_pages = 0; | |
1806 | ||
1807 | for_each_online_node(nid) | |
1808 | phys_pages += node_present_pages(nid); | |
1809 | ||
1810 | return phys_pages; | |
1811 | } | |
1812 | ||
0ee332c1 | 1813 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 1814 | /* |
0ee332c1 | 1815 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
1816 | * zones, allocate the backing mem_map and account for memory holes in a more |
1817 | * architecture independent manner. This is a substitute for creating the | |
1818 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1819 | * free_area_init_node() | |
1820 | * | |
1821 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 1822 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
1823 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1824 | * usage, an architecture is expected to do something like | |
1825 | * | |
1826 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1827 | * max_highmem_pfn}; | |
1828 | * for_each_valid_physical_page_range() | |
0ee332c1 | 1829 | * memblock_add_node(base, size, nid) |
c713216d MG |
1830 | * free_area_init_nodes(max_zone_pfns); |
1831 | * | |
0ee332c1 TH |
1832 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1833 | * registered physical page range. Similarly | |
1834 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
1835 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
1836 | * |
1837 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 1838 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
1839 | */ |
1840 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 1841 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
1842 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1843 | unsigned long end_pfn); | |
c713216d MG |
1844 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1845 | unsigned long end_pfn); | |
1846 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1847 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1848 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1849 | extern void free_bootmem_with_active_regions(int nid, |
1850 | unsigned long max_low_pfn); | |
1851 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 1852 | |
0ee332c1 | 1853 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 1854 | |
0ee332c1 | 1855 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 | 1856 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
8a942fde MG |
1857 | static inline int __early_pfn_to_nid(unsigned long pfn, |
1858 | struct mminit_pfnnid_cache *state) | |
f2dbcfa7 KH |
1859 | { |
1860 | return 0; | |
1861 | } | |
1862 | #else | |
1863 | /* please see mm/page_alloc.c */ | |
1864 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 | 1865 | /* there is a per-arch backend function. */ |
8a942fde MG |
1866 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
1867 | struct mminit_pfnnid_cache *state); | |
f2dbcfa7 KH |
1868 | #endif |
1869 | ||
0e0b864e | 1870 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1871 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1872 | unsigned long, enum memmap_context); | |
bc75d33f | 1873 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 1874 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 1875 | extern void mem_init(void); |
8feae131 | 1876 | extern void __init mmap_init(void); |
b2b755b5 | 1877 | extern void show_mem(unsigned int flags); |
d02bd27b | 1878 | extern long si_mem_available(void); |
1da177e4 LT |
1879 | extern void si_meminfo(struct sysinfo * val); |
1880 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
1881 | ||
3ee9a4f0 | 1882 | extern __printf(3, 4) |
d00181b9 KS |
1883 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, |
1884 | const char *fmt, ...); | |
a238ab5b | 1885 | |
e7c8d5c9 | 1886 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1887 | |
112067f0 | 1888 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 1889 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 1890 | |
75f7ad8e PS |
1891 | /* page_alloc.c */ |
1892 | extern int min_free_kbytes; | |
1893 | ||
8feae131 | 1894 | /* nommu.c */ |
33e5d769 | 1895 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1896 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1897 | |
6b2dbba8 | 1898 | /* interval_tree.c */ |
6b2dbba8 ML |
1899 | void vma_interval_tree_insert(struct vm_area_struct *node, |
1900 | struct rb_root *root); | |
9826a516 ML |
1901 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
1902 | struct vm_area_struct *prev, | |
1903 | struct rb_root *root); | |
6b2dbba8 ML |
1904 | void vma_interval_tree_remove(struct vm_area_struct *node, |
1905 | struct rb_root *root); | |
1906 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, | |
1907 | unsigned long start, unsigned long last); | |
1908 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
1909 | unsigned long start, unsigned long last); | |
1910 | ||
1911 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
1912 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
1913 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 1914 | |
bf181b9f ML |
1915 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
1916 | struct rb_root *root); | |
1917 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, | |
1918 | struct rb_root *root); | |
1919 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( | |
1920 | struct rb_root *root, unsigned long start, unsigned long last); | |
1921 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( | |
1922 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
1923 | #ifdef CONFIG_DEBUG_VM_RB |
1924 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
1925 | #endif | |
bf181b9f ML |
1926 | |
1927 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
1928 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
1929 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
1930 | ||
1da177e4 | 1931 | /* mmap.c */ |
34b4e4aa | 1932 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1933 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1934 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1935 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1936 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1937 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 1938 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 LT |
1939 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
1940 | extern int split_vma(struct mm_struct *, | |
1941 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1942 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1943 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1944 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1945 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 1946 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
1947 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
1948 | bool *need_rmap_locks); | |
1da177e4 | 1949 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 1950 | |
9c599024 CG |
1951 | static inline int check_data_rlimit(unsigned long rlim, |
1952 | unsigned long new, | |
1953 | unsigned long start, | |
1954 | unsigned long end_data, | |
1955 | unsigned long start_data) | |
1956 | { | |
1957 | if (rlim < RLIM_INFINITY) { | |
1958 | if (((new - start) + (end_data - start_data)) > rlim) | |
1959 | return -ENOSPC; | |
1960 | } | |
1961 | ||
1962 | return 0; | |
1963 | } | |
1964 | ||
7906d00c AA |
1965 | extern int mm_take_all_locks(struct mm_struct *mm); |
1966 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1967 | ||
38646013 JS |
1968 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
1969 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
925d1c40 | 1970 | |
84638335 KK |
1971 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
1972 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
1973 | ||
3935ed6a SS |
1974 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
1975 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
1976 | unsigned long flags, |
1977 | const struct vm_special_mapping *spec); | |
1978 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
1979 | extern int install_special_mapping(struct mm_struct *mm, |
1980 | unsigned long addr, unsigned long len, | |
1981 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
1982 | |
1983 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1984 | ||
0165ab44 | 1985 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
c22c0d63 | 1986 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
1fcfd8db | 1987 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 1988 | unsigned long len, unsigned long prot, unsigned long flags, |
1fcfd8db | 1989 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate); |
1da177e4 LT |
1990 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
1991 | ||
1fcfd8db ON |
1992 | static inline unsigned long |
1993 | do_mmap_pgoff(struct file *file, unsigned long addr, | |
1994 | unsigned long len, unsigned long prot, unsigned long flags, | |
1995 | unsigned long pgoff, unsigned long *populate) | |
1996 | { | |
1997 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate); | |
1998 | } | |
1999 | ||
bebeb3d6 ML |
2000 | #ifdef CONFIG_MMU |
2001 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2002 | int ignore_errors); | |
2003 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2004 | { | |
2005 | /* Ignore errors */ | |
2006 | (void) __mm_populate(addr, len, 1); | |
2007 | } | |
2008 | #else | |
2009 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2010 | #endif | |
2011 | ||
e4eb1ff6 LT |
2012 | /* These take the mm semaphore themselves */ |
2013 | extern unsigned long vm_brk(unsigned long, unsigned long); | |
bfce281c | 2014 | extern int vm_munmap(unsigned long, size_t); |
6be5ceb0 LT |
2015 | extern unsigned long vm_mmap(struct file *, unsigned long, |
2016 | unsigned long, unsigned long, | |
2017 | unsigned long, unsigned long); | |
1da177e4 | 2018 | |
db4fbfb9 ML |
2019 | struct vm_unmapped_area_info { |
2020 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2021 | unsigned long flags; | |
2022 | unsigned long length; | |
2023 | unsigned long low_limit; | |
2024 | unsigned long high_limit; | |
2025 | unsigned long align_mask; | |
2026 | unsigned long align_offset; | |
2027 | }; | |
2028 | ||
2029 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
2030 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
2031 | ||
2032 | /* | |
2033 | * Search for an unmapped address range. | |
2034 | * | |
2035 | * We are looking for a range that: | |
2036 | * - does not intersect with any VMA; | |
2037 | * - is contained within the [low_limit, high_limit) interval; | |
2038 | * - is at least the desired size. | |
2039 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
2040 | */ | |
2041 | static inline unsigned long | |
2042 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
2043 | { | |
cdd7875e | 2044 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
db4fbfb9 | 2045 | return unmapped_area_topdown(info); |
cdd7875e BP |
2046 | else |
2047 | return unmapped_area(info); | |
db4fbfb9 ML |
2048 | } |
2049 | ||
85821aab | 2050 | /* truncate.c */ |
1da177e4 | 2051 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2052 | extern void truncate_inode_pages_range(struct address_space *, |
2053 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2054 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2055 | |
2056 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 2057 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
f1820361 | 2058 | extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf); |
4fcf1c62 | 2059 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
1da177e4 LT |
2060 | |
2061 | /* mm/page-writeback.c */ | |
2062 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 2063 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
2064 | |
2065 | /* readahead.c */ | |
2066 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
2067 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 2068 | |
1da177e4 | 2069 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 2070 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
2071 | |
2072 | void page_cache_sync_readahead(struct address_space *mapping, | |
2073 | struct file_ra_state *ra, | |
2074 | struct file *filp, | |
2075 | pgoff_t offset, | |
2076 | unsigned long size); | |
2077 | ||
2078 | void page_cache_async_readahead(struct address_space *mapping, | |
2079 | struct file_ra_state *ra, | |
2080 | struct file *filp, | |
2081 | struct page *pg, | |
2082 | pgoff_t offset, | |
2083 | unsigned long size); | |
2084 | ||
d05f3169 | 2085 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2086 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
2087 | |
2088 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
2089 | extern int expand_downwards(struct vm_area_struct *vma, | |
2090 | unsigned long address); | |
8ca3eb08 | 2091 | #if VM_GROWSUP |
46dea3d0 | 2092 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2093 | #else |
fee7e49d | 2094 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2095 | #endif |
1da177e4 LT |
2096 | |
2097 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2098 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2099 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2100 | struct vm_area_struct **pprev); | |
2101 | ||
2102 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
2103 | NULL if none. Assume start_addr < end_addr. */ | |
2104 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
2105 | { | |
2106 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
2107 | ||
2108 | if (vma && end_addr <= vma->vm_start) | |
2109 | vma = NULL; | |
2110 | return vma; | |
2111 | } | |
2112 | ||
2113 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
2114 | { | |
2115 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2116 | } | |
2117 | ||
640708a2 PE |
2118 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2119 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2120 | unsigned long vm_start, unsigned long vm_end) | |
2121 | { | |
2122 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2123 | ||
2124 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2125 | vma = NULL; | |
2126 | ||
2127 | return vma; | |
2128 | } | |
2129 | ||
bad849b3 | 2130 | #ifdef CONFIG_MMU |
804af2cf | 2131 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2132 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2133 | #else |
2134 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2135 | { | |
2136 | return __pgprot(0); | |
2137 | } | |
64e45507 PF |
2138 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2139 | { | |
2140 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2141 | } | |
bad849b3 DH |
2142 | #endif |
2143 | ||
5877231f | 2144 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2145 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2146 | unsigned long start, unsigned long end); |
2147 | #endif | |
2148 | ||
deceb6cd | 2149 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2150 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2151 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 2152 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
2153 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
2154 | unsigned long pfn); | |
1745cbc5 AL |
2155 | int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
2156 | unsigned long pfn, pgprot_t pgprot); | |
423bad60 | 2157 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 2158 | pfn_t pfn); |
b4cbb197 LT |
2159 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2160 | ||
deceb6cd | 2161 | |
240aadee ML |
2162 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2163 | unsigned long address, unsigned int foll_flags, | |
2164 | unsigned int *page_mask); | |
2165 | ||
2166 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2167 | unsigned long address, unsigned int foll_flags) | |
2168 | { | |
2169 | unsigned int unused_page_mask; | |
2170 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2171 | } | |
2172 | ||
deceb6cd HD |
2173 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2174 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2175 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2176 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2177 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2178 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2179 | * and return without waiting upon it */ | |
84d33df2 | 2180 | #define FOLL_POPULATE 0x40 /* fault in page */ |
500d65d4 | 2181 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2182 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2183 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2184 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2185 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2186 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1da177e4 | 2187 | |
2f569afd | 2188 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2189 | void *data); |
2190 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2191 | unsigned long size, pte_fn_t fn, void *data); | |
2192 | ||
1da177e4 | 2193 | |
8823b1db LA |
2194 | #ifdef CONFIG_PAGE_POISONING |
2195 | extern bool page_poisoning_enabled(void); | |
2196 | extern void kernel_poison_pages(struct page *page, int numpages, int enable); | |
1414c7f4 | 2197 | extern bool page_is_poisoned(struct page *page); |
8823b1db LA |
2198 | #else |
2199 | static inline bool page_poisoning_enabled(void) { return false; } | |
2200 | static inline void kernel_poison_pages(struct page *page, int numpages, | |
2201 | int enable) { } | |
1414c7f4 | 2202 | static inline bool page_is_poisoned(struct page *page) { return false; } |
8823b1db LA |
2203 | #endif |
2204 | ||
12d6f21e | 2205 | #ifdef CONFIG_DEBUG_PAGEALLOC |
031bc574 JK |
2206 | extern bool _debug_pagealloc_enabled; |
2207 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); | |
2208 | ||
2209 | static inline bool debug_pagealloc_enabled(void) | |
2210 | { | |
2211 | return _debug_pagealloc_enabled; | |
2212 | } | |
2213 | ||
2214 | static inline void | |
2215 | kernel_map_pages(struct page *page, int numpages, int enable) | |
2216 | { | |
2217 | if (!debug_pagealloc_enabled()) | |
2218 | return; | |
2219 | ||
2220 | __kernel_map_pages(page, numpages, enable); | |
2221 | } | |
8a235efa RW |
2222 | #ifdef CONFIG_HIBERNATION |
2223 | extern bool kernel_page_present(struct page *page); | |
40b44137 JK |
2224 | #endif /* CONFIG_HIBERNATION */ |
2225 | #else /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2226 | static inline void |
9858db50 | 2227 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2228 | #ifdef CONFIG_HIBERNATION |
2229 | static inline bool kernel_page_present(struct page *page) { return true; } | |
40b44137 JK |
2230 | #endif /* CONFIG_HIBERNATION */ |
2231 | static inline bool debug_pagealloc_enabled(void) | |
2232 | { | |
2233 | return false; | |
2234 | } | |
2235 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2236 | |
a6c19dfe | 2237 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2238 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2239 | extern int in_gate_area_no_mm(unsigned long addr); |
2240 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2241 | #else |
a6c19dfe AL |
2242 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2243 | { | |
2244 | return NULL; | |
2245 | } | |
2246 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2247 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2248 | { | |
2249 | return 0; | |
2250 | } | |
1da177e4 LT |
2251 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2252 | ||
146732ce JT |
2253 | #ifdef CONFIG_SYSCTL |
2254 | extern int sysctl_drop_caches; | |
8d65af78 | 2255 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2256 | void __user *, size_t *, loff_t *); |
146732ce JT |
2257 | #endif |
2258 | ||
cb731d6c VD |
2259 | void drop_slab(void); |
2260 | void drop_slab_node(int nid); | |
9d0243bc | 2261 | |
7a9166e3 LY |
2262 | #ifndef CONFIG_MMU |
2263 | #define randomize_va_space 0 | |
2264 | #else | |
a62eaf15 | 2265 | extern int randomize_va_space; |
7a9166e3 | 2266 | #endif |
a62eaf15 | 2267 | |
045e72ac | 2268 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2269 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2270 | |
9bdac914 YL |
2271 | void sparse_mem_maps_populate_node(struct page **map_map, |
2272 | unsigned long pnum_begin, | |
2273 | unsigned long pnum_end, | |
2274 | unsigned long map_count, | |
2275 | int nodeid); | |
2276 | ||
98f3cfc1 | 2277 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
2278 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
2279 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
2280 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
2281 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2282 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc DW |
2283 | struct vmem_altmap; |
2284 | void *__vmemmap_alloc_block_buf(unsigned long size, int node, | |
2285 | struct vmem_altmap *altmap); | |
2286 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node) | |
2287 | { | |
2288 | return __vmemmap_alloc_block_buf(size, node, NULL); | |
2289 | } | |
2290 | ||
8f6aac41 | 2291 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2292 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2293 | int node); | |
2294 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2295 | void vmemmap_populate_print_last(void); |
0197518c | 2296 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2297 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2298 | #endif |
46723bfa YI |
2299 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
2300 | unsigned long size); | |
6a46079c | 2301 | |
82ba011b AK |
2302 | enum mf_flags { |
2303 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2304 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2305 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2306 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2307 | }; |
cd42f4a3 | 2308 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2309 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2310 | extern int unpoison_memory(unsigned long pfn); |
ead07f6a | 2311 | extern int get_hwpoison_page(struct page *page); |
4e41a30c | 2312 | #define put_hwpoison_page(page) put_page(page) |
6a46079c AK |
2313 | extern int sysctl_memory_failure_early_kill; |
2314 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2315 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2316 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2317 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2318 | |
cc637b17 XX |
2319 | |
2320 | /* | |
2321 | * Error handlers for various types of pages. | |
2322 | */ | |
cc3e2af4 | 2323 | enum mf_result { |
cc637b17 XX |
2324 | MF_IGNORED, /* Error: cannot be handled */ |
2325 | MF_FAILED, /* Error: handling failed */ | |
2326 | MF_DELAYED, /* Will be handled later */ | |
2327 | MF_RECOVERED, /* Successfully recovered */ | |
2328 | }; | |
2329 | ||
2330 | enum mf_action_page_type { | |
2331 | MF_MSG_KERNEL, | |
2332 | MF_MSG_KERNEL_HIGH_ORDER, | |
2333 | MF_MSG_SLAB, | |
2334 | MF_MSG_DIFFERENT_COMPOUND, | |
2335 | MF_MSG_POISONED_HUGE, | |
2336 | MF_MSG_HUGE, | |
2337 | MF_MSG_FREE_HUGE, | |
2338 | MF_MSG_UNMAP_FAILED, | |
2339 | MF_MSG_DIRTY_SWAPCACHE, | |
2340 | MF_MSG_CLEAN_SWAPCACHE, | |
2341 | MF_MSG_DIRTY_MLOCKED_LRU, | |
2342 | MF_MSG_CLEAN_MLOCKED_LRU, | |
2343 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
2344 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
2345 | MF_MSG_DIRTY_LRU, | |
2346 | MF_MSG_CLEAN_LRU, | |
2347 | MF_MSG_TRUNCATED_LRU, | |
2348 | MF_MSG_BUDDY, | |
2349 | MF_MSG_BUDDY_2ND, | |
2350 | MF_MSG_UNKNOWN, | |
2351 | }; | |
2352 | ||
47ad8475 AA |
2353 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2354 | extern void clear_huge_page(struct page *page, | |
2355 | unsigned long addr, | |
2356 | unsigned int pages_per_huge_page); | |
2357 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2358 | unsigned long addr, struct vm_area_struct *vma, | |
2359 | unsigned int pages_per_huge_page); | |
2360 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ | |
2361 | ||
e30825f1 JK |
2362 | extern struct page_ext_operations debug_guardpage_ops; |
2363 | extern struct page_ext_operations page_poisoning_ops; | |
2364 | ||
c0a32fc5 SG |
2365 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2366 | extern unsigned int _debug_guardpage_minorder; | |
e30825f1 | 2367 | extern bool _debug_guardpage_enabled; |
c0a32fc5 SG |
2368 | |
2369 | static inline unsigned int debug_guardpage_minorder(void) | |
2370 | { | |
2371 | return _debug_guardpage_minorder; | |
2372 | } | |
2373 | ||
e30825f1 JK |
2374 | static inline bool debug_guardpage_enabled(void) |
2375 | { | |
2376 | return _debug_guardpage_enabled; | |
2377 | } | |
2378 | ||
c0a32fc5 SG |
2379 | static inline bool page_is_guard(struct page *page) |
2380 | { | |
e30825f1 JK |
2381 | struct page_ext *page_ext; |
2382 | ||
2383 | if (!debug_guardpage_enabled()) | |
2384 | return false; | |
2385 | ||
2386 | page_ext = lookup_page_ext(page); | |
2387 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
c0a32fc5 SG |
2388 | } |
2389 | #else | |
2390 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 2391 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
2392 | static inline bool page_is_guard(struct page *page) { return false; } |
2393 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2394 | ||
f9872caf CS |
2395 | #if MAX_NUMNODES > 1 |
2396 | void __init setup_nr_node_ids(void); | |
2397 | #else | |
2398 | static inline void setup_nr_node_ids(void) {} | |
2399 | #endif | |
2400 | ||
1da177e4 LT |
2401 | #endif /* __KERNEL__ */ |
2402 | #endif /* _LINUX_MM_H */ |