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
);
21 static inline void set_page_count(struct page
*page
, int v
)
23 atomic_set(&page
->_count
, v
);
27 * Turn a non-refcounted page (->_count == 0) into refcounted with
30 static inline void set_page_refcounted(struct page
*page
)
32 VM_BUG_ON(PageTail(page
));
33 VM_BUG_ON(atomic_read(&page
->_count
));
34 set_page_count(page
, 1);
37 static inline void __put_page(struct page
*page
)
39 atomic_dec(&page
->_count
);
45 extern int isolate_lru_page(struct page
*page
);
46 extern void putback_lru_page(struct page
*page
);
51 extern void __free_pages_bootmem(struct page
*page
, unsigned int order
);
54 * function for dealing with page's order in buddy system.
55 * zone->lock is already acquired when we use these.
56 * So, we don't need atomic page->flags operations here.
58 static inline unsigned long page_order(struct page
*page
)
60 VM_BUG_ON(!PageBuddy(page
));
61 return page_private(page
);
64 extern long mlock_vma_pages_range(struct vm_area_struct
*vma
,
65 unsigned long start
, unsigned long end
);
66 extern void munlock_vma_pages_range(struct vm_area_struct
*vma
,
67 unsigned long start
, unsigned long end
);
68 static inline void munlock_vma_pages_all(struct vm_area_struct
*vma
)
70 munlock_vma_pages_range(vma
, vma
->vm_start
, vma
->vm_end
);
73 #ifdef CONFIG_UNEVICTABLE_LRU
75 * unevictable_migrate_page() called only from migrate_page_copy() to
76 * migrate unevictable flag to new page.
77 * Note that the old page has been isolated from the LRU lists at this
78 * point so we don't need to worry about LRU statistics.
80 static inline void unevictable_migrate_page(struct page
*new, struct page
*old
)
82 if (TestClearPageUnevictable(old
))
83 SetPageUnevictable(new);
86 static inline void unevictable_migrate_page(struct page
*new, struct page
*old
)
91 #ifdef CONFIG_UNEVICTABLE_LRU
93 * Called only in fault path via page_evictable() for a new page
94 * to determine if it's being mapped into a LOCKED vma.
95 * If so, mark page as mlocked.
97 static inline int is_mlocked_vma(struct vm_area_struct
*vma
, struct page
*page
)
99 VM_BUG_ON(PageLRU(page
));
101 if (likely((vma
->vm_flags
& (VM_LOCKED
| VM_SPECIAL
)) != VM_LOCKED
))
104 if (!TestSetPageMlocked(page
)) {
105 inc_zone_page_state(page
, NR_MLOCK
);
106 count_vm_event(UNEVICTABLE_PGMLOCKED
);
112 * must be called with vma's mmap_sem held for read, and page locked.
114 extern void mlock_vma_page(struct page
*page
);
117 * Clear the page's PageMlocked(). This can be useful in a situation where
118 * we want to unconditionally remove a page from the pagecache -- e.g.,
119 * on truncation or freeing.
121 * It is legal to call this function for any page, mlocked or not.
122 * If called for a page that is still mapped by mlocked vmas, all we do
123 * is revert to lazy LRU behaviour -- semantics are not broken.
125 extern void __clear_page_mlock(struct page
*page
);
126 static inline void clear_page_mlock(struct page
*page
)
128 if (unlikely(TestClearPageMlocked(page
)))
129 __clear_page_mlock(page
);
133 * mlock_migrate_page - called only from migrate_page_copy() to
134 * migrate the Mlocked page flag; update statistics.
136 static inline void mlock_migrate_page(struct page
*newpage
, struct page
*page
)
138 if (TestClearPageMlocked(page
)) {
141 local_irq_save(flags
);
142 __dec_zone_page_state(page
, NR_MLOCK
);
143 SetPageMlocked(newpage
);
144 __inc_zone_page_state(newpage
, NR_MLOCK
);
145 local_irq_restore(flags
);
150 * free_page_mlock() -- clean up attempts to free and mlocked() page.
151 * Page should not be on lru, so no need to fix that up.
152 * free_pages_check() will verify...
154 static inline void free_page_mlock(struct page
*page
)
156 if (unlikely(TestClearPageMlocked(page
))) {
159 local_irq_save(flags
);
160 __dec_zone_page_state(page
, NR_MLOCK
);
161 __count_vm_event(UNEVICTABLE_MLOCKFREED
);
162 local_irq_restore(flags
);
166 #else /* CONFIG_UNEVICTABLE_LRU */
167 static inline int is_mlocked_vma(struct vm_area_struct
*v
, struct page
*p
)
171 static inline void clear_page_mlock(struct page
*page
) { }
172 static inline void mlock_vma_page(struct page
*page
) { }
173 static inline void mlock_migrate_page(struct page
*new, struct page
*old
) { }
174 static inline void free_page_mlock(struct page
*page
) { }
176 #endif /* CONFIG_UNEVICTABLE_LRU */
179 * Return the mem_map entry representing the 'offset' subpage within
180 * the maximally aligned gigantic page 'base'. Handle any discontiguity
181 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
183 static inline struct page
*mem_map_offset(struct page
*base
, int offset
)
185 if (unlikely(offset
>= MAX_ORDER_NR_PAGES
))
186 return pfn_to_page(page_to_pfn(base
) + offset
);
187 return base
+ offset
;
191 * Iterator over all subpages withing the maximally aligned gigantic
192 * page 'base'. Handle any discontiguity in the mem_map.
194 static inline struct page
*mem_map_next(struct page
*iter
,
195 struct page
*base
, int offset
)
197 if (unlikely((offset
& (MAX_ORDER_NR_PAGES
- 1)) == 0)) {
198 unsigned long pfn
= page_to_pfn(base
) + offset
;
201 return pfn_to_page(pfn
);
207 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
208 * so all functions starting at paging_init should be marked __init
209 * in those cases. SPARSEMEM, however, allows for memory hotplug,
210 * and alloc_bootmem_node is not used.
212 #ifdef CONFIG_SPARSEMEM
213 #define __paginginit __meminit
215 #define __paginginit __init
218 /* Memory initialisation debug and verification */
225 #ifdef CONFIG_DEBUG_MEMORY_INIT
227 extern int mminit_loglevel
;
229 #define mminit_dprintk(level, prefix, fmt, arg...) \
231 if (level < mminit_loglevel) { \
232 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
233 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
237 extern void mminit_verify_pageflags_layout(void);
238 extern void mminit_verify_page_links(struct page
*page
,
239 enum zone_type zone
, unsigned long nid
, unsigned long pfn
);
240 extern void mminit_verify_zonelist(void);
244 static inline void mminit_dprintk(enum mminit_level level
,
245 const char *prefix
, const char *fmt
, ...)
249 static inline void mminit_verify_pageflags_layout(void)
253 static inline void mminit_verify_page_links(struct page
*page
,
254 enum zone_type zone
, unsigned long nid
, unsigned long pfn
)
258 static inline void mminit_verify_zonelist(void)
261 #endif /* CONFIG_DEBUG_MEMORY_INIT */
263 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
264 #if defined(CONFIG_SPARSEMEM)
265 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
266 unsigned long *end_pfn
);
268 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
269 unsigned long *end_pfn
)
272 #endif /* CONFIG_SPARSEMEM */
274 #define GUP_FLAGS_WRITE 0x1
275 #define GUP_FLAGS_FORCE 0x2
276 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
278 int __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
279 unsigned long start
, int len
, int flags
,
280 struct page
**pages
, struct vm_area_struct
**vmas
);
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