merge sock_alloc_fd/sock_attach_fd into a new helper
[linux-2.6/linux-2.6-openrd.git] / mm / internal.h
blob4fe67a162cb4ef022d3555d336fc34e005a0f0b2
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);
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_MMU
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);
77 * Called only in fault path via page_evictable() for a new page
78 * to determine if it's being mapped into a LOCKED vma.
79 * If so, mark page as mlocked.
81 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
83 VM_BUG_ON(PageLRU(page));
85 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
86 return 0;
88 if (!TestSetPageMlocked(page)) {
89 inc_zone_page_state(page, NR_MLOCK);
90 count_vm_event(UNEVICTABLE_PGMLOCKED);
92 return 1;
96 * must be called with vma's mmap_sem held for read or write, and page locked.
98 extern void mlock_vma_page(struct page *page);
99 extern void munlock_vma_page(struct page *page);
102 * Clear the page's PageMlocked(). This can be useful in a situation where
103 * we want to unconditionally remove a page from the pagecache -- e.g.,
104 * on truncation or freeing.
106 * It is legal to call this function for any page, mlocked or not.
107 * If called for a page that is still mapped by mlocked vmas, all we do
108 * is revert to lazy LRU behaviour -- semantics are not broken.
110 extern void __clear_page_mlock(struct page *page);
111 static inline void clear_page_mlock(struct page *page)
113 if (unlikely(TestClearPageMlocked(page)))
114 __clear_page_mlock(page);
118 * mlock_migrate_page - called only from migrate_page_copy() to
119 * migrate the Mlocked page flag; update statistics.
121 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
123 if (TestClearPageMlocked(page)) {
124 unsigned long flags;
126 local_irq_save(flags);
127 __dec_zone_page_state(page, NR_MLOCK);
128 SetPageMlocked(newpage);
129 __inc_zone_page_state(newpage, NR_MLOCK);
130 local_irq_restore(flags);
134 #else /* !CONFIG_MMU */
135 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
137 return 0;
139 static inline void clear_page_mlock(struct page *page) { }
140 static inline void mlock_vma_page(struct page *page) { }
141 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
143 #endif /* !CONFIG_MMU */
146 * Return the mem_map entry representing the 'offset' subpage within
147 * the maximally aligned gigantic page 'base'. Handle any discontiguity
148 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
150 static inline struct page *mem_map_offset(struct page *base, int offset)
152 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
153 return pfn_to_page(page_to_pfn(base) + offset);
154 return base + offset;
158 * Iterator over all subpages withing the maximally aligned gigantic
159 * page 'base'. Handle any discontiguity in the mem_map.
161 static inline struct page *mem_map_next(struct page *iter,
162 struct page *base, int offset)
164 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
165 unsigned long pfn = page_to_pfn(base) + offset;
166 if (!pfn_valid(pfn))
167 return NULL;
168 return pfn_to_page(pfn);
170 return iter + 1;
174 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
175 * so all functions starting at paging_init should be marked __init
176 * in those cases. SPARSEMEM, however, allows for memory hotplug,
177 * and alloc_bootmem_node is not used.
179 #ifdef CONFIG_SPARSEMEM
180 #define __paginginit __meminit
181 #else
182 #define __paginginit __init
183 #endif
185 /* Memory initialisation debug and verification */
186 enum mminit_level {
187 MMINIT_WARNING,
188 MMINIT_VERIFY,
189 MMINIT_TRACE
192 #ifdef CONFIG_DEBUG_MEMORY_INIT
194 extern int mminit_loglevel;
196 #define mminit_dprintk(level, prefix, fmt, arg...) \
197 do { \
198 if (level < mminit_loglevel) { \
199 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
200 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
202 } while (0)
204 extern void mminit_verify_pageflags_layout(void);
205 extern void mminit_verify_page_links(struct page *page,
206 enum zone_type zone, unsigned long nid, unsigned long pfn);
207 extern void mminit_verify_zonelist(void);
209 #else
211 static inline void mminit_dprintk(enum mminit_level level,
212 const char *prefix, const char *fmt, ...)
216 static inline void mminit_verify_pageflags_layout(void)
220 static inline void mminit_verify_page_links(struct page *page,
221 enum zone_type zone, unsigned long nid, unsigned long pfn)
225 static inline void mminit_verify_zonelist(void)
228 #endif /* CONFIG_DEBUG_MEMORY_INIT */
230 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
231 #if defined(CONFIG_SPARSEMEM)
232 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
233 unsigned long *end_pfn);
234 #else
235 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
236 unsigned long *end_pfn)
239 #endif /* CONFIG_SPARSEMEM */
241 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
242 unsigned long start, int len, unsigned int foll_flags,
243 struct page **pages, struct vm_area_struct **vmas);
245 #define ZONE_RECLAIM_NOSCAN -2
246 #define ZONE_RECLAIM_FULL -1
247 #define ZONE_RECLAIM_SOME 0
248 #define ZONE_RECLAIM_SUCCESS 1
249 #endif