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1da177e4 LT |
1 | /* internal.h: mm/ internal definitions |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
0f8053a5 NP |
11 | #ifndef __MM_INTERNAL_H |
12 | #define __MM_INTERNAL_H | |
13 | ||
14 | #include <linux/mm.h> | |
1da177e4 | 15 | |
42b77728 JB |
16 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
17 | unsigned long floor, unsigned long ceiling); | |
18 | ||
01ad1c08 | 19 | extern void prep_compound_page(struct page *page, unsigned long order); |
18229df5 | 20 | extern void prep_compound_gigantic_page(struct page *page, unsigned long order); |
01ad1c08 | 21 | |
7835e98b | 22 | static inline void set_page_count(struct page *page, int v) |
77a8a788 | 23 | { |
7835e98b NP |
24 | atomic_set(&page->_count, v); |
25 | } | |
26 | ||
27 | /* | |
28 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
29 | * a count of one. | |
30 | */ | |
31 | static inline void set_page_refcounted(struct page *page) | |
32 | { | |
ae1276b9 | 33 | VM_BUG_ON(PageTail(page)); |
725d704e | 34 | VM_BUG_ON(atomic_read(&page->_count)); |
77a8a788 | 35 | set_page_count(page, 1); |
77a8a788 NP |
36 | } |
37 | ||
0f8053a5 NP |
38 | static inline void __put_page(struct page *page) |
39 | { | |
40 | atomic_dec(&page->_count); | |
41 | } | |
42 | ||
894bc310 LS |
43 | /* |
44 | * in mm/vmscan.c: | |
45 | */ | |
62695a84 | 46 | extern int isolate_lru_page(struct page *page); |
894bc310 | 47 | extern void putback_lru_page(struct page *page); |
62695a84 | 48 | |
894bc310 LS |
49 | /* |
50 | * in mm/page_alloc.c | |
51 | */ | |
0c0a4a51 | 52 | extern void __free_pages_bootmem(struct page *page, unsigned int order); |
0f8053a5 | 53 | |
48f13bf3 MG |
54 | /* |
55 | * function for dealing with page's order in buddy system. | |
56 | * zone->lock is already acquired when we use these. | |
57 | * So, we don't need atomic page->flags operations here. | |
58 | */ | |
59 | static inline unsigned long page_order(struct page *page) | |
60 | { | |
61 | VM_BUG_ON(!PageBuddy(page)); | |
62 | return page_private(page); | |
63 | } | |
b5a0e011 | 64 | |
ba470de4 | 65 | extern long mlock_vma_pages_range(struct vm_area_struct *vma, |
b291f000 | 66 | unsigned long start, unsigned long end); |
ba470de4 RR |
67 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
68 | unsigned long start, unsigned long end); | |
69 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
70 | { | |
71 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
72 | } | |
b291f000 | 73 | |
894bc310 LS |
74 | #ifdef CONFIG_UNEVICTABLE_LRU |
75 | /* | |
76 | * unevictable_migrate_page() called only from migrate_page_copy() to | |
77 | * migrate unevictable flag to new page. | |
78 | * Note that the old page has been isolated from the LRU lists at this | |
79 | * point so we don't need to worry about LRU statistics. | |
80 | */ | |
81 | static inline void unevictable_migrate_page(struct page *new, struct page *old) | |
82 | { | |
83 | if (TestClearPageUnevictable(old)) | |
84 | SetPageUnevictable(new); | |
85 | } | |
86 | #else | |
87 | static inline void unevictable_migrate_page(struct page *new, struct page *old) | |
88 | { | |
89 | } | |
90 | #endif | |
91 | ||
b291f000 NP |
92 | #ifdef CONFIG_UNEVICTABLE_LRU |
93 | /* | |
94 | * Called only in fault path via page_evictable() for a new page | |
95 | * to determine if it's being mapped into a LOCKED vma. | |
96 | * If so, mark page as mlocked. | |
97 | */ | |
98 | static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) | |
99 | { | |
100 | VM_BUG_ON(PageLRU(page)); | |
101 | ||
102 | if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) | |
103 | return 0; | |
104 | ||
5344b7e6 NP |
105 | if (!TestSetPageMlocked(page)) { |
106 | inc_zone_page_state(page, NR_MLOCK); | |
107 | count_vm_event(UNEVICTABLE_PGMLOCKED); | |
108 | } | |
b291f000 NP |
109 | return 1; |
110 | } | |
111 | ||
112 | /* | |
113 | * must be called with vma's mmap_sem held for read, and page locked. | |
114 | */ | |
115 | extern void mlock_vma_page(struct page *page); | |
116 | ||
117 | /* | |
118 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
119 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
120 | * on truncation or freeing. | |
121 | * | |
122 | * It is legal to call this function for any page, mlocked or not. | |
123 | * If called for a page that is still mapped by mlocked vmas, all we do | |
124 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
125 | */ | |
126 | extern void __clear_page_mlock(struct page *page); | |
127 | static inline void clear_page_mlock(struct page *page) | |
128 | { | |
129 | if (unlikely(TestClearPageMlocked(page))) | |
130 | __clear_page_mlock(page); | |
131 | } | |
132 | ||
133 | /* | |
134 | * mlock_migrate_page - called only from migrate_page_copy() to | |
5344b7e6 | 135 | * migrate the Mlocked page flag; update statistics. |
b291f000 NP |
136 | */ |
137 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
138 | { | |
5344b7e6 NP |
139 | if (TestClearPageMlocked(page)) { |
140 | unsigned long flags; | |
141 | ||
142 | local_irq_save(flags); | |
143 | __dec_zone_page_state(page, NR_MLOCK); | |
b291f000 | 144 | SetPageMlocked(newpage); |
5344b7e6 NP |
145 | __inc_zone_page_state(newpage, NR_MLOCK); |
146 | local_irq_restore(flags); | |
147 | } | |
b291f000 NP |
148 | } |
149 | ||
985737cf LS |
150 | /* |
151 | * free_page_mlock() -- clean up attempts to free and mlocked() page. | |
152 | * Page should not be on lru, so no need to fix that up. | |
153 | * free_pages_check() will verify... | |
154 | */ | |
155 | static inline void free_page_mlock(struct page *page) | |
156 | { | |
157 | if (unlikely(TestClearPageMlocked(page))) { | |
158 | unsigned long flags; | |
159 | ||
160 | local_irq_save(flags); | |
161 | __dec_zone_page_state(page, NR_MLOCK); | |
162 | __count_vm_event(UNEVICTABLE_MLOCKFREED); | |
163 | local_irq_restore(flags); | |
164 | } | |
165 | } | |
b291f000 NP |
166 | |
167 | #else /* CONFIG_UNEVICTABLE_LRU */ | |
168 | static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) | |
169 | { | |
170 | return 0; | |
171 | } | |
172 | static inline void clear_page_mlock(struct page *page) { } | |
173 | static inline void mlock_vma_page(struct page *page) { } | |
174 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
985737cf | 175 | static inline void free_page_mlock(struct page *page) { } |
b291f000 NP |
176 | |
177 | #endif /* CONFIG_UNEVICTABLE_LRU */ | |
894bc310 | 178 | |
69d177c2 AW |
179 | /* |
180 | * Return the mem_map entry representing the 'offset' subpage within | |
181 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
182 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
183 | */ | |
184 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
185 | { | |
186 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
187 | return pfn_to_page(page_to_pfn(base) + offset); | |
188 | return base + offset; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Iterator over all subpages withing the maximally aligned gigantic | |
193 | * page 'base'. Handle any discontiguity in the mem_map. | |
194 | */ | |
195 | static inline struct page *mem_map_next(struct page *iter, | |
196 | struct page *base, int offset) | |
197 | { | |
198 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
199 | unsigned long pfn = page_to_pfn(base) + offset; | |
200 | if (!pfn_valid(pfn)) | |
201 | return NULL; | |
202 | return pfn_to_page(pfn); | |
203 | } | |
204 | return iter + 1; | |
205 | } | |
206 | ||
b5a0e011 AH |
207 | /* |
208 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
209 | * so all functions starting at paging_init should be marked __init | |
210 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
211 | * and alloc_bootmem_node is not used. | |
212 | */ | |
213 | #ifdef CONFIG_SPARSEMEM | |
214 | #define __paginginit __meminit | |
215 | #else | |
216 | #define __paginginit __init | |
217 | #endif | |
218 | ||
6b74ab97 MG |
219 | /* Memory initialisation debug and verification */ |
220 | enum mminit_level { | |
221 | MMINIT_WARNING, | |
222 | MMINIT_VERIFY, | |
223 | MMINIT_TRACE | |
224 | }; | |
225 | ||
226 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
227 | ||
228 | extern int mminit_loglevel; | |
229 | ||
230 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
231 | do { \ | |
232 | if (level < mminit_loglevel) { \ | |
233 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ | |
234 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ | |
235 | } \ | |
236 | } while (0) | |
237 | ||
708614e6 MG |
238 | extern void mminit_verify_pageflags_layout(void); |
239 | extern void mminit_verify_page_links(struct page *page, | |
240 | enum zone_type zone, unsigned long nid, unsigned long pfn); | |
68ad8df4 | 241 | extern void mminit_verify_zonelist(void); |
708614e6 | 242 | |
6b74ab97 MG |
243 | #else |
244 | ||
245 | static inline void mminit_dprintk(enum mminit_level level, | |
246 | const char *prefix, const char *fmt, ...) | |
247 | { | |
248 | } | |
249 | ||
708614e6 MG |
250 | static inline void mminit_verify_pageflags_layout(void) |
251 | { | |
252 | } | |
253 | ||
254 | static inline void mminit_verify_page_links(struct page *page, | |
255 | enum zone_type zone, unsigned long nid, unsigned long pfn) | |
256 | { | |
257 | } | |
68ad8df4 MG |
258 | |
259 | static inline void mminit_verify_zonelist(void) | |
260 | { | |
261 | } | |
6b74ab97 | 262 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
263 | |
264 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
265 | #if defined(CONFIG_SPARSEMEM) | |
266 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
267 | unsigned long *end_pfn); | |
268 | #else | |
269 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
270 | unsigned long *end_pfn) | |
271 | { | |
272 | } | |
273 | #endif /* CONFIG_SPARSEMEM */ | |
274 | ||
b291f000 NP |
275 | #define GUP_FLAGS_WRITE 0x1 |
276 | #define GUP_FLAGS_FORCE 0x2 | |
277 | #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4 | |
278 | ||
279 | int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, | |
280 | unsigned long start, int len, int flags, | |
281 | struct page **pages, struct vm_area_struct **vmas); | |
282 | ||
0f8053a5 | 283 | #endif |