nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / mm / internal.h
blobd071d380fb498ab36ac6700343bf86485463bdbe
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
14 #include <linux/mm.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
26 * a count of one.
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;
43 * in mm/vmscan.c:
45 extern int isolate_lru_page(struct page *page);
46 extern void putback_lru_page(struct page *page);
49 * in mm/page_alloc.c
51 extern void __free_pages_bootmem(struct page *page, unsigned int order);
52 extern void prep_compound_page(struct page *page, unsigned long order);
53 #ifdef CONFIG_MEMORY_FAILURE
54 extern bool is_free_buddy_page(struct page *page);
55 #endif
59 * function for dealing with page's order in buddy system.
60 * zone->lock is already acquired when we use these.
61 * So, we don't need atomic page->flags operations here.
63 static inline unsigned long page_order(struct page *page)
65 /* PageBuddy() must be checked by the caller */
66 return page_private(page);
69 /* mm/util.c */
70 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
71 struct vm_area_struct *prev, struct rb_node *rb_parent);
73 #ifdef CONFIG_MMU
74 extern long mlock_vma_pages_range(struct vm_area_struct *vma,
75 unsigned long start, unsigned long end);
76 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
77 unsigned long start, unsigned long end);
78 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
80 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
84 * Called only in fault path via page_evictable() for a new page
85 * to determine if it's being mapped into a LOCKED vma.
86 * If so, mark page as mlocked.
88 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
90 VM_BUG_ON(PageLRU(page));
92 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
93 return 0;
95 if (!TestSetPageMlocked(page)) {
96 inc_zone_page_state(page, NR_MLOCK);
97 count_vm_event(UNEVICTABLE_PGMLOCKED);
99 return 1;
103 * must be called with vma's mmap_sem held for read or write, and page locked.
105 extern void mlock_vma_page(struct page *page);
106 extern void munlock_vma_page(struct page *page);
109 * Clear the page's PageMlocked(). This can be useful in a situation where
110 * we want to unconditionally remove a page from the pagecache -- e.g.,
111 * on truncation or freeing.
113 * It is legal to call this function for any page, mlocked or not.
114 * If called for a page that is still mapped by mlocked vmas, all we do
115 * is revert to lazy LRU behaviour -- semantics are not broken.
117 extern void __clear_page_mlock(struct page *page);
118 static inline void clear_page_mlock(struct page *page)
120 if (unlikely(TestClearPageMlocked(page)))
121 __clear_page_mlock(page);
125 * mlock_migrate_page - called only from migrate_page_copy() to
126 * migrate the Mlocked page flag; update statistics.
128 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
130 if (TestClearPageMlocked(page)) {
131 unsigned long flags;
133 local_irq_save(flags);
134 __dec_zone_page_state(page, NR_MLOCK);
135 SetPageMlocked(newpage);
136 __inc_zone_page_state(newpage, NR_MLOCK);
137 local_irq_restore(flags);
141 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
142 extern unsigned long vma_address(struct page *page,
143 struct vm_area_struct *vma);
144 #endif
145 #else /* !CONFIG_MMU */
146 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
148 return 0;
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) { }
154 #endif /* !CONFIG_MMU */
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.
161 static inline struct page *mem_map_offset(struct page *base, int offset)
163 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
164 return pfn_to_page(page_to_pfn(base) + offset);
165 return base + offset;
169 * Iterator over all subpages within the maximally aligned gigantic
170 * page 'base'. Handle any discontiguity in the mem_map.
172 static inline struct page *mem_map_next(struct page *iter,
173 struct page *base, int offset)
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);
181 return iter + 1;
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.
190 #ifdef CONFIG_SPARSEMEM
191 #define __paginginit __meminit
192 #else
193 #define __paginginit __init
194 #endif
196 /* Memory initialisation debug and verification */
197 enum mminit_level {
198 MMINIT_WARNING,
199 MMINIT_VERIFY,
200 MMINIT_TRACE
203 #ifdef CONFIG_DEBUG_MEMORY_INIT
205 extern int mminit_loglevel;
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); \
213 } while (0)
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);
218 extern void mminit_verify_zonelist(void);
220 #else
222 static inline void mminit_dprintk(enum mminit_level level,
223 const char *prefix, const char *fmt, ...)
227 static inline void mminit_verify_pageflags_layout(void)
231 static inline void mminit_verify_page_links(struct page *page,
232 enum zone_type zone, unsigned long nid, unsigned long pfn)
236 static inline void mminit_verify_zonelist(void)
239 #endif /* CONFIG_DEBUG_MEMORY_INIT */
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)
250 #endif /* CONFIG_SPARSEMEM */
252 #define ZONE_RECLAIM_NOSCAN -2
253 #define ZONE_RECLAIM_FULL -1
254 #define ZONE_RECLAIM_SOME 0
255 #define ZONE_RECLAIM_SUCCESS 1
256 #endif
258 extern int hwpoison_filter(struct page *p);
260 extern u32 hwpoison_filter_dev_major;
261 extern u32 hwpoison_filter_dev_minor;
262 extern u64 hwpoison_filter_flags_mask;
263 extern u64 hwpoison_filter_flags_value;
264 extern u64 hwpoison_filter_memcg;
265 extern u32 hwpoison_filter_enable;