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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 | ||
7835e98b | 19 | static inline void set_page_count(struct page *page, int v) |
77a8a788 | 20 | { |
7835e98b NP |
21 | atomic_set(&page->_count, v); |
22 | } | |
23 | ||
24 | /* | |
25 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
26 | * a count of one. | |
27 | */ | |
28 | static inline void set_page_refcounted(struct page *page) | |
29 | { | |
ae1276b9 | 30 | VM_BUG_ON(PageTail(page)); |
725d704e | 31 | VM_BUG_ON(atomic_read(&page->_count)); |
77a8a788 | 32 | set_page_count(page, 1); |
77a8a788 NP |
33 | } |
34 | ||
0f8053a5 NP |
35 | static inline void __put_page(struct page *page) |
36 | { | |
37 | atomic_dec(&page->_count); | |
38 | } | |
39 | ||
03f6462a HD |
40 | extern unsigned long highest_memmap_pfn; |
41 | ||
894bc310 LS |
42 | /* |
43 | * in mm/vmscan.c: | |
44 | */ | |
62695a84 | 45 | extern int isolate_lru_page(struct page *page); |
894bc310 | 46 | extern void putback_lru_page(struct page *page); |
62695a84 | 47 | |
894bc310 LS |
48 | /* |
49 | * in mm/page_alloc.c | |
50 | */ | |
0c0a4a51 | 51 | extern void __free_pages_bootmem(struct page *page, unsigned int order); |
20a0307c WF |
52 | extern void prep_compound_page(struct page *page, unsigned long order); |
53 | ||
0f8053a5 | 54 | |
48f13bf3 MG |
55 | /* |
56 | * function for dealing with page's order in buddy system. | |
57 | * zone->lock is already acquired when we use these. | |
58 | * So, we don't need atomic page->flags operations here. | |
59 | */ | |
60 | static inline unsigned long page_order(struct page *page) | |
61 | { | |
62 | VM_BUG_ON(!PageBuddy(page)); | |
63 | return page_private(page); | |
64 | } | |
b5a0e011 | 65 | |
894bc310 LS |
66 | /* |
67 | * unevictable_migrate_page() called only from migrate_page_copy() to | |
68 | * migrate unevictable flag to new page. | |
69 | * Note that the old page has been isolated from the LRU lists at this | |
70 | * point so we don't need to worry about LRU statistics. | |
71 | */ | |
72 | static inline void unevictable_migrate_page(struct page *new, struct page *old) | |
73 | { | |
74 | if (TestClearPageUnevictable(old)) | |
75 | SetPageUnevictable(new); | |
76 | } | |
894bc310 | 77 | |
af8e3354 HD |
78 | #ifdef CONFIG_MMU |
79 | extern long mlock_vma_pages_range(struct vm_area_struct *vma, | |
80 | unsigned long start, unsigned long end); | |
81 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, | |
82 | unsigned long start, unsigned long end); | |
83 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) | |
84 | { | |
85 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); | |
86 | } | |
87 | ||
b291f000 NP |
88 | /* |
89 | * Called only in fault path via page_evictable() for a new page | |
90 | * to determine if it's being mapped into a LOCKED vma. | |
91 | * If so, mark page as mlocked. | |
92 | */ | |
93 | static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) | |
94 | { | |
95 | VM_BUG_ON(PageLRU(page)); | |
96 | ||
97 | if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) | |
98 | return 0; | |
99 | ||
5344b7e6 NP |
100 | if (!TestSetPageMlocked(page)) { |
101 | inc_zone_page_state(page, NR_MLOCK); | |
102 | count_vm_event(UNEVICTABLE_PGMLOCKED); | |
103 | } | |
b291f000 NP |
104 | return 1; |
105 | } | |
106 | ||
107 | /* | |
108 | * must be called with vma's mmap_sem held for read, and page locked. | |
109 | */ | |
110 | extern void mlock_vma_page(struct page *page); | |
111 | ||
112 | /* | |
113 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
114 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
115 | * on truncation or freeing. | |
116 | * | |
117 | * It is legal to call this function for any page, mlocked or not. | |
118 | * If called for a page that is still mapped by mlocked vmas, all we do | |
119 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
120 | */ | |
121 | extern void __clear_page_mlock(struct page *page); | |
122 | static inline void clear_page_mlock(struct page *page) | |
123 | { | |
124 | if (unlikely(TestClearPageMlocked(page))) | |
125 | __clear_page_mlock(page); | |
126 | } | |
127 | ||
128 | /* | |
129 | * mlock_migrate_page - called only from migrate_page_copy() to | |
5344b7e6 | 130 | * migrate the Mlocked page flag; update statistics. |
b291f000 NP |
131 | */ |
132 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
133 | { | |
5344b7e6 NP |
134 | if (TestClearPageMlocked(page)) { |
135 | unsigned long flags; | |
136 | ||
137 | local_irq_save(flags); | |
138 | __dec_zone_page_state(page, NR_MLOCK); | |
b291f000 | 139 | SetPageMlocked(newpage); |
5344b7e6 NP |
140 | __inc_zone_page_state(newpage, NR_MLOCK); |
141 | local_irq_restore(flags); | |
142 | } | |
b291f000 NP |
143 | } |
144 | ||
af8e3354 | 145 | #else /* !CONFIG_MMU */ |
b291f000 NP |
146 | static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) |
147 | { | |
148 | return 0; | |
149 | } | |
150 | static inline void clear_page_mlock(struct page *page) { } | |
151 | static inline void mlock_vma_page(struct page *page) { } | |
152 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
153 | ||
af8e3354 | 154 | #endif /* !CONFIG_MMU */ |
894bc310 | 155 | |
69d177c2 AW |
156 | /* |
157 | * Return the mem_map entry representing the 'offset' subpage within | |
158 | * the maximally aligned gigantic page 'base'. Handle any discontiguity | |
159 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. | |
160 | */ | |
161 | static inline struct page *mem_map_offset(struct page *base, int offset) | |
162 | { | |
163 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) | |
164 | return pfn_to_page(page_to_pfn(base) + offset); | |
165 | return base + offset; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Iterator over all subpages withing the maximally aligned gigantic | |
170 | * page 'base'. Handle any discontiguity in the mem_map. | |
171 | */ | |
172 | static inline struct page *mem_map_next(struct page *iter, | |
173 | struct page *base, int offset) | |
174 | { | |
175 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { | |
176 | unsigned long pfn = page_to_pfn(base) + offset; | |
177 | if (!pfn_valid(pfn)) | |
178 | return NULL; | |
179 | return pfn_to_page(pfn); | |
180 | } | |
181 | return iter + 1; | |
182 | } | |
183 | ||
b5a0e011 AH |
184 | /* |
185 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
186 | * so all functions starting at paging_init should be marked __init | |
187 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
188 | * and alloc_bootmem_node is not used. | |
189 | */ | |
190 | #ifdef CONFIG_SPARSEMEM | |
191 | #define __paginginit __meminit | |
192 | #else | |
193 | #define __paginginit __init | |
194 | #endif | |
195 | ||
6b74ab97 MG |
196 | /* Memory initialisation debug and verification */ |
197 | enum mminit_level { | |
198 | MMINIT_WARNING, | |
199 | MMINIT_VERIFY, | |
200 | MMINIT_TRACE | |
201 | }; | |
202 | ||
203 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
204 | ||
205 | extern int mminit_loglevel; | |
206 | ||
207 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
208 | do { \ | |
209 | if (level < mminit_loglevel) { \ | |
210 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ | |
211 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ | |
212 | } \ | |
213 | } while (0) | |
214 | ||
708614e6 MG |
215 | extern void mminit_verify_pageflags_layout(void); |
216 | extern void mminit_verify_page_links(struct page *page, | |
217 | enum zone_type zone, unsigned long nid, unsigned long pfn); | |
68ad8df4 | 218 | extern void mminit_verify_zonelist(void); |
708614e6 | 219 | |
6b74ab97 MG |
220 | #else |
221 | ||
222 | static inline void mminit_dprintk(enum mminit_level level, | |
223 | const char *prefix, const char *fmt, ...) | |
224 | { | |
225 | } | |
226 | ||
708614e6 MG |
227 | static inline void mminit_verify_pageflags_layout(void) |
228 | { | |
229 | } | |
230 | ||
231 | static inline void mminit_verify_page_links(struct page *page, | |
232 | enum zone_type zone, unsigned long nid, unsigned long pfn) | |
233 | { | |
234 | } | |
68ad8df4 MG |
235 | |
236 | static inline void mminit_verify_zonelist(void) | |
237 | { | |
238 | } | |
6b74ab97 | 239 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
240 | |
241 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
242 | #if defined(CONFIG_SPARSEMEM) | |
243 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
244 | unsigned long *end_pfn); | |
245 | #else | |
246 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
247 | unsigned long *end_pfn) | |
248 | { | |
249 | } | |
250 | #endif /* CONFIG_SPARSEMEM */ | |
251 | ||
b291f000 | 252 | int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
58fa879e | 253 | unsigned long start, int len, unsigned int foll_flags, |
b291f000 NP |
254 | struct page **pages, struct vm_area_struct **vmas); |
255 | ||
fa5e084e MG |
256 | #define ZONE_RECLAIM_NOSCAN -2 |
257 | #define ZONE_RECLAIM_FULL -1 | |
258 | #define ZONE_RECLAIM_SOME 0 | |
259 | #define ZONE_RECLAIM_SUCCESS 1 | |
0f8053a5 | 260 | #endif |