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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 static inline void set_page_count(struct page
*page
, int v
)
21 atomic_set(&page
->_count
, v
);
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
28 static inline void set_page_refcounted(struct page
*page
)
30 VM_BUG_ON(PageTail(page
));
31 VM_BUG_ON(atomic_read(&page
->_count
));
32 set_page_count(page
, 1);
35 static inline void __put_page(struct page
*page
)
37 atomic_dec(&page
->_count
);
40 extern unsigned long highest_memmap_pfn
;
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
);
52 extern void prep_compound_page(struct page
*page
, unsigned long 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 #ifdef CONFIG_HAVE_MLOCK
67 extern long mlock_vma_pages_range(struct vm_area_struct
*vma
,
68 unsigned long start
, unsigned long end
);
69 extern void munlock_vma_pages_range(struct vm_area_struct
*vma
,
70 unsigned long start
, unsigned long end
);
71 static inline void munlock_vma_pages_all(struct vm_area_struct
*vma
)
73 munlock_vma_pages_range(vma
, vma
->vm_start
, vma
->vm_end
);
78 * unevictable_migrate_page() called only from migrate_page_copy() to
79 * migrate unevictable flag to new page.
80 * Note that the old page has been isolated from the LRU lists at this
81 * point so we don't need to worry about LRU statistics.
83 static inline void unevictable_migrate_page(struct page
*new, struct page
*old
)
85 if (TestClearPageUnevictable(old
))
86 SetPageUnevictable(new);
89 #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
91 * Called only in fault path via page_evictable() for a new page
92 * to determine if it's being mapped into a LOCKED vma.
93 * If so, mark page as mlocked.
95 static inline int is_mlocked_vma(struct vm_area_struct
*vma
, struct page
*page
)
97 VM_BUG_ON(PageLRU(page
));
99 if (likely((vma
->vm_flags
& (VM_LOCKED
| VM_SPECIAL
)) != VM_LOCKED
))
102 if (!TestSetPageMlocked(page
)) {
103 inc_zone_page_state(page
, NR_MLOCK
);
104 count_vm_event(UNEVICTABLE_PGMLOCKED
);
110 * must be called with vma's mmap_sem held for read, and page locked.
112 extern void mlock_vma_page(struct page
*page
);
115 * Clear the page's PageMlocked(). This can be useful in a situation where
116 * we want to unconditionally remove a page from the pagecache -- e.g.,
117 * on truncation or freeing.
119 * It is legal to call this function for any page, mlocked or not.
120 * If called for a page that is still mapped by mlocked vmas, all we do
121 * is revert to lazy LRU behaviour -- semantics are not broken.
123 extern void __clear_page_mlock(struct page
*page
);
124 static inline void clear_page_mlock(struct page
*page
)
126 if (unlikely(TestClearPageMlocked(page
)))
127 __clear_page_mlock(page
);
131 * mlock_migrate_page - called only from migrate_page_copy() to
132 * migrate the Mlocked page flag; update statistics.
134 static inline void mlock_migrate_page(struct page
*newpage
, struct page
*page
)
136 if (TestClearPageMlocked(page
)) {
139 local_irq_save(flags
);
140 __dec_zone_page_state(page
, NR_MLOCK
);
141 SetPageMlocked(newpage
);
142 __inc_zone_page_state(newpage
, NR_MLOCK
);
143 local_irq_restore(flags
);
147 #else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
148 static inline int is_mlocked_vma(struct vm_area_struct
*v
, struct page
*p
)
152 static inline void clear_page_mlock(struct page
*page
) { }
153 static inline void mlock_vma_page(struct page
*page
) { }
154 static inline void mlock_migrate_page(struct page
*new, struct page
*old
) { }
156 #endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
159 * Return the mem_map entry representing the 'offset' subpage within
160 * the maximally aligned gigantic page 'base'. Handle any discontiguity
161 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
163 static inline struct page
*mem_map_offset(struct page
*base
, int offset
)
165 if (unlikely(offset
>= MAX_ORDER_NR_PAGES
))
166 return pfn_to_page(page_to_pfn(base
) + offset
);
167 return base
+ offset
;
171 * Iterator over all subpages withing the maximally aligned gigantic
172 * page 'base'. Handle any discontiguity in the mem_map.
174 static inline struct page
*mem_map_next(struct page
*iter
,
175 struct page
*base
, int offset
)
177 if (unlikely((offset
& (MAX_ORDER_NR_PAGES
- 1)) == 0)) {
178 unsigned long pfn
= page_to_pfn(base
) + offset
;
181 return pfn_to_page(pfn
);
187 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
188 * so all functions starting at paging_init should be marked __init
189 * in those cases. SPARSEMEM, however, allows for memory hotplug,
190 * and alloc_bootmem_node is not used.
192 #ifdef CONFIG_SPARSEMEM
193 #define __paginginit __meminit
195 #define __paginginit __init
198 /* Memory initialisation debug and verification */
205 #ifdef CONFIG_DEBUG_MEMORY_INIT
207 extern int mminit_loglevel
;
209 #define mminit_dprintk(level, prefix, fmt, arg...) \
211 if (level < mminit_loglevel) { \
212 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
213 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
217 extern void mminit_verify_pageflags_layout(void);
218 extern void mminit_verify_page_links(struct page
*page
,
219 enum zone_type zone
, unsigned long nid
, unsigned long pfn
);
220 extern void mminit_verify_zonelist(void);
224 static inline void mminit_dprintk(enum mminit_level level
,
225 const char *prefix
, const char *fmt
, ...)
229 static inline void mminit_verify_pageflags_layout(void)
233 static inline void mminit_verify_page_links(struct page
*page
,
234 enum zone_type zone
, unsigned long nid
, unsigned long pfn
)
238 static inline void mminit_verify_zonelist(void)
241 #endif /* CONFIG_DEBUG_MEMORY_INIT */
243 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
244 #if defined(CONFIG_SPARSEMEM)
245 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
246 unsigned long *end_pfn
);
248 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn
,
249 unsigned long *end_pfn
)
252 #endif /* CONFIG_SPARSEMEM */
254 int __get_user_pages(struct task_struct
*tsk
, struct mm_struct
*mm
,
255 unsigned long start
, int len
, unsigned int foll_flags
,
256 struct page
**pages
, struct vm_area_struct
**vmas
);
258 #define ZONE_RECLAIM_NOSCAN -2
259 #define ZONE_RECLAIM_FULL -1
260 #define ZONE_RECLAIM_SOME 0
261 #define ZONE_RECLAIM_SUCCESS 1