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1 /* internal.h: mm/ internal definitions
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #ifndef __MM_INTERNAL_H
12 #define __MM_INTERNAL_H
16 void free_pgtables(struct mmu_gather
*tlb
, struct vm_area_struct
*start_vma
,
17 unsigned long floor
, unsigned long ceiling
);
19 extern void prep_compound_page(struct page
*page
, unsigned long order
);
20 extern void prep_compound_gigantic_page(struct page
*page
, unsigned long order
);
22 static inline void set_page_count(struct page
*page
, int v
)
24 atomic_set(&page
->_count
, v
);
28 * Turn a non-refcounted page (->_count == 0) into refcounted with
31 static inline void set_page_refcounted(struct page
*page
)
33 VM_BUG_ON(PageTail(page
));
34 VM_BUG_ON(atomic_read(&page
->_count
));
35 set_page_count(page
, 1);
38 static inline void __put_page(struct page
*page
)
40 atomic_dec(&page
->_count
);
46 extern int isolate_lru_page(struct page
*page
);
47 extern void putback_lru_page(struct page
*page
);
52 extern unsigned long highest_memmap_pfn
;
53 extern void __free_pages_bootmem(struct page
*page
, unsigned int order
);
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.
60 static inline unsigned long page_order(struct page
*page
)
62 VM_BUG_ON(!PageBuddy(page
));
63 return page_private(page
);
66 extern long mlock_vma_pages_range(struct vm_area_struct
*vma
,
67 unsigned long start
, unsigned long end
);
68 extern void munlock_vma_pages_range(struct vm_area_struct
*vma
,
69 unsigned long start
, unsigned long end
);
70 static inline void munlock_vma_pages_all(struct vm_area_struct
*vma
)
72 munlock_vma_pages_range(vma
, vma
->vm_start
, vma
->vm_end
);
75 #ifdef CONFIG_UNEVICTABLE_LRU
77 * unevictable_migrate_page() called only from migrate_page_copy() to
78 * migrate unevictable flag to new page.
79 * Note that the old page has been isolated from the LRU lists at this
80 * point so we don't need to worry about LRU statistics.
82 static inline void unevictable_migrate_page(struct page
*new, struct page
*old
)
84 if (TestClearPageUnevictable(old
))
85 SetPageUnevictable(new);
88 static inline void unevictable_migrate_page(struct page
*new, struct page
*old
)
93 #ifdef CONFIG_UNEVICTABLE_LRU
95 * Called only in fault path via page_evictable() for a new page
96 * to determine if it's being mapped into a LOCKED vma.
97 * If so, mark page as mlocked.
99 static inline int is_mlocked_vma(struct vm_area_struct
*vma
, struct page
*page
)
101 VM_BUG_ON(PageLRU(page
));
103 if (likely((vma
->vm_flags
& (VM_LOCKED
| VM_SPECIAL
)) != VM_LOCKED
))
106 if (!TestSetPageMlocked(page
)) {
107 inc_zone_page_state(page
, NR_MLOCK
);
108 count_vm_event(UNEVICTABLE_PGMLOCKED
);
114 * must be called with vma's mmap_sem held for read, and page locked.
116 extern void mlock_vma_page(struct page
*page
);
119 * Clear the page's PageMlocked(). This can be useful in a situation where
120 * we want to unconditionally remove a page from the pagecache -- e.g.,
121 * on truncation or freeing.
123 * It is legal to call this function for any page, mlocked or not.
124 * If called for a page that is still mapped by mlocked vmas, all we do
125 * is revert to lazy LRU behaviour -- semantics are not broken.
127 extern void __clear_page_mlock(struct page
*page
);
128 static inline void clear_page_mlock(struct page
*page
)
130 if (unlikely(TestClearPageMlocked(page
)))
131 __clear_page_mlock(page
);
135 * mlock_migrate_page - called only from migrate_page_copy() to
136 * migrate the Mlocked page flag; update statistics.
138 static inline void mlock_migrate_page(struct page
*newpage
, struct page
*page
)
140 if (TestClearPageMlocked(page
)) {
143 local_irq_save(flags
);
144 __dec_zone_page_state(page
, NR_MLOCK
);
145 SetPageMlocked(newpage
);
146 __inc_zone_page_state(newpage
, NR_MLOCK
);
147 local_irq_restore(flags
);
152 * free_page_mlock() -- clean up attempts to free and mlocked() page.
153 * Page should not be on lru, so no need to fix that up.
154 * free_pages_check() will verify...
156 static inline void free_page_mlock(struct page
*page
)
158 if (unlikely(TestClearPageMlocked(page
))) {
161 local_irq_save(flags
);
162 __dec_zone_page_state(page
, NR_MLOCK
);
163 __count_vm_event(UNEVICTABLE_MLOCKFREED
);
164 local_irq_restore(flags
);
168 #else /* CONFIG_UNEVICTABLE_LRU */
169 static inline int is_mlocked_vma(struct vm_area_struct
*v
, struct page
*p
)
173 static inline void clear_page_mlock(struct page
*page
) { }
174 static inline void mlock_vma_page(struct page
*page
) { }
175 static inline void mlock_migrate_page(struct page
*new, struct page
*old
) { }
176 static inline void free_page_mlock(struct page
*page
) { }
178 #endif /* CONFIG_UNEVICTABLE_LRU */
181 * Return the mem_map entry representing the 'offset' subpage within
182 * the maximally aligned gigantic page 'base'. Handle any discontiguity
183 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
185 static inline struct page
*mem_map_offset(struct page
*base
, int offset
)
187 if (unlikely(offset
>= MAX_ORDER_NR_PAGES
))
188 return pfn_to_page(page_to_pfn(base
) + offset
);
189 return base
+ offset
;
193 * Iterator over all subpages withing the maximally aligned gigantic
194 * page 'base'. Handle any discontiguity in the mem_map.
196 static inline struct page
*mem_map_next(struct page
*iter
,
197 struct page
*base
, int offset
)
199 if (unlikely((offset
& (MAX_ORDER_NR_PAGES
- 1)) == 0)) {
200 unsigned long pfn
= page_to_pfn(base
) + offset
;
203 return pfn_to_page(pfn
);
209 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
210 * so all functions starting at paging_init should be marked __init
211 * in those cases. SPARSEMEM, however, allows for memory hotplug,
212 * and alloc_bootmem_node is not used.
214 #ifdef CONFIG_SPARSEMEM
215 #define __paginginit __meminit
217 #define __paginginit __init
220 /* Memory initialisation debug and verification */
227 #ifdef CONFIG_DEBUG_MEMORY_INIT
229 extern int mminit_loglevel
;
231 #define mminit_dprintk(level, prefix, fmt, arg...) \
233 if (level < mminit_loglevel) { \
234 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
235 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
239 extern void mminit_verify_pageflags_layout(void);
240 extern void mminit_verify_page_links(struct page
*page
,
241 enum zone_type zone
, unsigned long nid
, unsigned long pfn
);
242 extern void mminit_verify_zonelist(void);
246 static inline void mminit_dprintk(enum mminit_level level
,
247 const char *prefix
, const char *fmt
, ...)
251 static inline void mminit_verify_pageflags_layout(void)
255 static inline void mminit_verify_page_links(struct page
*page
,
256 enum zone_type zone
, unsigned long nid
, unsigned long pfn
)
260 static inline void mminit_verify_zonelist(void)
263 #endif /* CONFIG_DEBUG_MEMORY_INIT */
265 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
266 #if defined(CONFIG_SPARSEMEM)
267 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
268 unsigned long *end_pfn
);
270 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
271 unsigned long *end_pfn
)
274 #endif /* CONFIG_SPARSEMEM */
276 #define GUP_FLAGS_WRITE 0x1
277 #define GUP_FLAGS_FORCE 0x2
278 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
279 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
281 int __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
282 unsigned long start
, int len
, int flags
,
283 struct page
**pages
, struct vm_area_struct
**vmas
);