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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 | */ |
11 | #ifndef __MM_INTERNAL_H |
12 | #define __MM_INTERNAL_H |
13 | |
14 | #include <linux/fs.h> |
15 | #include <linux/mm.h> |
16 | |
17 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
18 | unsigned long floor, unsigned long ceiling); |
19 | |
20 | static inline void set_page_count(struct page *page, int v) |
21 | { |
22 | atomic_set(&page->_count, v); |
23 | } |
24 | |
25 | extern int __do_page_cache_readahead(struct address_space *mapping, |
26 | struct file *filp, pgoff_t offset, unsigned long nr_to_read, |
27 | unsigned long lookahead_size); |
28 | |
29 | /* |
30 | * Submit IO for the read-ahead request in file_ra_state. |
31 | */ |
32 | static inline unsigned long ra_submit(struct file_ra_state *ra, |
33 | struct address_space *mapping, struct file *filp) |
34 | { |
35 | return __do_page_cache_readahead(mapping, filp, |
36 | ra->start, ra->size, ra->async_size); |
37 | } |
38 | |
39 | /* |
40 | * Turn a non-refcounted page (->_count == 0) into refcounted with |
41 | * a count of one. |
42 | */ |
43 | static inline void set_page_refcounted(struct page *page) |
44 | { |
45 | VM_BUG_ON_PAGE(PageTail(page), page); |
46 | VM_BUG_ON_PAGE(atomic_read(&page->_count), page); |
47 | set_page_count(page, 1); |
48 | } |
49 | |
50 | static inline void __get_page_tail_foll(struct page *page, |
51 | bool get_page_head) |
52 | { |
53 | /* |
54 | * If we're getting a tail page, the elevated page->_count is |
55 | * required only in the head page and we will elevate the head |
56 | * page->_count and tail page->_mapcount. |
57 | * |
58 | * We elevate page_tail->_mapcount for tail pages to force |
59 | * page_tail->_count to be zero at all times to avoid getting |
60 | * false positives from get_page_unless_zero() with |
61 | * speculative page access (like in |
62 | * page_cache_get_speculative()) on tail pages. |
63 | */ |
64 | VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page); |
65 | if (get_page_head) |
66 | atomic_inc(&page->first_page->_count); |
67 | get_huge_page_tail(page); |
68 | } |
69 | |
70 | /* |
71 | * This is meant to be called as the FOLL_GET operation of |
72 | * follow_page() and it must be called while holding the proper PT |
73 | * lock while the pte (or pmd_trans_huge) is still mapping the page. |
74 | */ |
75 | static inline void get_page_foll(struct page *page) |
76 | { |
77 | if (unlikely(PageTail(page))) |
78 | /* |
79 | * This is safe only because |
80 | * __split_huge_page_refcount() can't run under |
81 | * get_page_foll() because we hold the proper PT lock. |
82 | */ |
83 | __get_page_tail_foll(page, true); |
84 | else { |
85 | /* |
86 | * Getting a normal page or the head of a compound page |
87 | * requires to already have an elevated page->_count. |
88 | */ |
89 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
90 | atomic_inc(&page->_count); |
91 | } |
92 | } |
93 | |
94 | extern unsigned long highest_memmap_pfn; |
95 | |
96 | /* |
97 | * in mm/vmscan.c: |
98 | */ |
99 | extern int isolate_lru_page(struct page *page); |
100 | extern void putback_lru_page(struct page *page); |
101 | extern bool zone_reclaimable(struct zone *zone); |
102 | |
103 | /* |
104 | * in mm/rmap.c: |
105 | */ |
106 | extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); |
107 | |
108 | /* |
109 | * in mm/page_alloc.c |
110 | */ |
111 | extern void __free_pages_bootmem(struct page *page, unsigned int order); |
112 | extern void prep_compound_page(struct page *page, unsigned long order); |
113 | #ifdef CONFIG_MEMORY_FAILURE |
114 | extern bool is_free_buddy_page(struct page *page); |
115 | #endif |
116 | extern int user_min_free_kbytes; |
117 | |
118 | #if defined CONFIG_COMPACTION || defined CONFIG_CMA |
119 | |
120 | /* |
121 | * in mm/compaction.c |
122 | */ |
123 | /* |
124 | * compact_control is used to track pages being migrated and the free pages |
125 | * they are being migrated to during memory compaction. The free_pfn starts |
126 | * at the end of a zone and migrate_pfn begins at the start. Movable pages |
127 | * are moved to the end of a zone during a compaction run and the run |
128 | * completes when free_pfn <= migrate_pfn |
129 | */ |
130 | struct compact_control { |
131 | struct list_head freepages; /* List of free pages to migrate to */ |
132 | struct list_head migratepages; /* List of pages being migrated */ |
133 | unsigned long nr_freepages; /* Number of isolated free pages */ |
134 | unsigned long nr_migratepages; /* Number of pages to migrate */ |
135 | unsigned long free_pfn; /* isolate_freepages search base */ |
136 | unsigned long migrate_pfn; /* isolate_migratepages search base */ |
137 | enum migrate_mode mode; /* Async or sync migration mode */ |
138 | bool ignore_skip_hint; /* Scan blocks even if marked skip */ |
139 | bool finished_update_free; /* True when the zone cached pfns are |
140 | * no longer being updated |
141 | */ |
142 | bool finished_update_migrate; |
143 | |
144 | int order; /* order a direct compactor needs */ |
145 | int migratetype; /* MOVABLE, RECLAIMABLE etc */ |
146 | struct zone *zone; |
147 | bool contended; /* True if a lock was contended, or |
148 | * need_resched() true during async |
149 | * compaction |
150 | */ |
151 | }; |
152 | |
153 | unsigned long |
154 | isolate_freepages_range(struct compact_control *cc, |
155 | unsigned long start_pfn, unsigned long end_pfn); |
156 | unsigned long |
157 | isolate_migratepages_range(struct zone *zone, struct compact_control *cc, |
158 | unsigned long low_pfn, unsigned long end_pfn, bool unevictable); |
159 | |
160 | #endif |
161 | |
162 | /* |
163 | * This function returns the order of a free page in the buddy system. In |
164 | * general, page_zone(page)->lock must be held by the caller to prevent the |
165 | * page from being allocated in parallel and returning garbage as the order. |
166 | * If a caller does not hold page_zone(page)->lock, it must guarantee that the |
167 | * page cannot be allocated or merged in parallel. |
168 | */ |
169 | static inline unsigned long page_order(struct page *page) |
170 | { |
171 | /* PageBuddy() must be checked by the caller */ |
172 | return page_private(page); |
173 | } |
174 | |
175 | static inline bool is_cow_mapping(vm_flags_t flags) |
176 | { |
177 | return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; |
178 | } |
179 | |
180 | /* mm/util.c */ |
181 | void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, |
182 | struct vm_area_struct *prev, struct rb_node *rb_parent); |
183 | |
184 | #ifdef CONFIG_MMU |
185 | extern long __mlock_vma_pages_range(struct vm_area_struct *vma, |
186 | unsigned long start, unsigned long end, int *nonblocking); |
187 | extern void munlock_vma_pages_range(struct vm_area_struct *vma, |
188 | unsigned long start, unsigned long end); |
189 | static inline void munlock_vma_pages_all(struct vm_area_struct *vma) |
190 | { |
191 | munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); |
192 | } |
193 | |
194 | /* |
195 | * must be called with vma's mmap_sem held for read or write, and page locked. |
196 | */ |
197 | extern void mlock_vma_page(struct page *page); |
198 | extern unsigned int munlock_vma_page(struct page *page); |
199 | |
200 | /* |
201 | * Clear the page's PageMlocked(). This can be useful in a situation where |
202 | * we want to unconditionally remove a page from the pagecache -- e.g., |
203 | * on truncation or freeing. |
204 | * |
205 | * It is legal to call this function for any page, mlocked or not. |
206 | * If called for a page that is still mapped by mlocked vmas, all we do |
207 | * is revert to lazy LRU behaviour -- semantics are not broken. |
208 | */ |
209 | extern void clear_page_mlock(struct page *page); |
210 | |
211 | /* |
212 | * mlock_migrate_page - called only from migrate_page_copy() to |
213 | * migrate the Mlocked page flag; update statistics. |
214 | */ |
215 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) |
216 | { |
217 | if (TestClearPageMlocked(page)) { |
218 | unsigned long flags; |
219 | int nr_pages = hpage_nr_pages(page); |
220 | |
221 | local_irq_save(flags); |
222 | __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); |
223 | SetPageMlocked(newpage); |
224 | __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); |
225 | local_irq_restore(flags); |
226 | } |
227 | } |
228 | |
229 | extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); |
230 | |
231 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
232 | extern unsigned long vma_address(struct page *page, |
233 | struct vm_area_struct *vma); |
234 | #endif |
235 | #else /* !CONFIG_MMU */ |
236 | static inline void clear_page_mlock(struct page *page) { } |
237 | static inline void mlock_vma_page(struct page *page) { } |
238 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } |
239 | |
240 | #endif /* !CONFIG_MMU */ |
241 | |
242 | /* |
243 | * Return the mem_map entry representing the 'offset' subpage within |
244 | * the maximally aligned gigantic page 'base'. Handle any discontiguity |
245 | * in the mem_map at MAX_ORDER_NR_PAGES boundaries. |
246 | */ |
247 | static inline struct page *mem_map_offset(struct page *base, int offset) |
248 | { |
249 | if (unlikely(offset >= MAX_ORDER_NR_PAGES)) |
250 | return pfn_to_page(page_to_pfn(base) + offset); |
251 | return base + offset; |
252 | } |
253 | |
254 | /* |
255 | * Iterator over all subpages within the maximally aligned gigantic |
256 | * page 'base'. Handle any discontiguity in the mem_map. |
257 | */ |
258 | static inline struct page *mem_map_next(struct page *iter, |
259 | struct page *base, int offset) |
260 | { |
261 | if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { |
262 | unsigned long pfn = page_to_pfn(base) + offset; |
263 | if (!pfn_valid(pfn)) |
264 | return NULL; |
265 | return pfn_to_page(pfn); |
266 | } |
267 | return iter + 1; |
268 | } |
269 | |
270 | /* |
271 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, |
272 | * so all functions starting at paging_init should be marked __init |
273 | * in those cases. SPARSEMEM, however, allows for memory hotplug, |
274 | * and alloc_bootmem_node is not used. |
275 | */ |
276 | #ifdef CONFIG_SPARSEMEM |
277 | #define __paginginit __meminit |
278 | #else |
279 | #define __paginginit __init |
280 | #endif |
281 | |
282 | /* Memory initialisation debug and verification */ |
283 | enum mminit_level { |
284 | MMINIT_WARNING, |
285 | MMINIT_VERIFY, |
286 | MMINIT_TRACE |
287 | }; |
288 | |
289 | #ifdef CONFIG_DEBUG_MEMORY_INIT |
290 | |
291 | extern int mminit_loglevel; |
292 | |
293 | #define mminit_dprintk(level, prefix, fmt, arg...) \ |
294 | do { \ |
295 | if (level < mminit_loglevel) { \ |
296 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ |
297 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ |
298 | } \ |
299 | } while (0) |
300 | |
301 | extern void mminit_verify_pageflags_layout(void); |
302 | extern void mminit_verify_page_links(struct page *page, |
303 | enum zone_type zone, unsigned long nid, unsigned long pfn); |
304 | extern void mminit_verify_zonelist(void); |
305 | |
306 | #else |
307 | |
308 | static inline void mminit_dprintk(enum mminit_level level, |
309 | const char *prefix, const char *fmt, ...) |
310 | { |
311 | } |
312 | |
313 | static inline void mminit_verify_pageflags_layout(void) |
314 | { |
315 | } |
316 | |
317 | static inline void mminit_verify_page_links(struct page *page, |
318 | enum zone_type zone, unsigned long nid, unsigned long pfn) |
319 | { |
320 | } |
321 | |
322 | static inline void mminit_verify_zonelist(void) |
323 | { |
324 | } |
325 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
326 | |
327 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ |
328 | #if defined(CONFIG_SPARSEMEM) |
329 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, |
330 | unsigned long *end_pfn); |
331 | #else |
332 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, |
333 | unsigned long *end_pfn) |
334 | { |
335 | } |
336 | #endif /* CONFIG_SPARSEMEM */ |
337 | |
338 | #define ZONE_RECLAIM_NOSCAN -2 |
339 | #define ZONE_RECLAIM_FULL -1 |
340 | #define ZONE_RECLAIM_SOME 0 |
341 | #define ZONE_RECLAIM_SUCCESS 1 |
342 | |
343 | extern int hwpoison_filter(struct page *p); |
344 | |
345 | extern u32 hwpoison_filter_dev_major; |
346 | extern u32 hwpoison_filter_dev_minor; |
347 | extern u64 hwpoison_filter_flags_mask; |
348 | extern u64 hwpoison_filter_flags_value; |
349 | extern u64 hwpoison_filter_memcg; |
350 | extern u32 hwpoison_filter_enable; |
351 | |
352 | extern unsigned long vm_mmap_pgoff(struct file *, unsigned long, |
353 | unsigned long, unsigned long, |
354 | unsigned long, unsigned long); |
355 | |
356 | extern void set_pageblock_order(void); |
357 | unsigned long reclaim_clean_pages_from_list(struct zone *zone, |
358 | struct list_head *page_list); |
359 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
360 | #define ALLOC_WMARK_MIN WMARK_MIN |
361 | #define ALLOC_WMARK_LOW WMARK_LOW |
362 | #define ALLOC_WMARK_HIGH WMARK_HIGH |
363 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ |
364 | |
365 | /* Mask to get the watermark bits */ |
366 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) |
367 | |
368 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ |
369 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ |
370 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ |
371 | #define ALLOC_CMA 0x80 /* allow allocations from CMA areas */ |
372 | #define ALLOC_FAIR 0x100 /* fair zone allocation */ |
373 | |
374 | #endif /* __MM_INTERNAL_H */ |
375 |
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