mm: fix proc_dointvec_userhz_jiffies "breakage"
[linux-2.6-block.git] / mm / internal.h
CommitLineData
1da177e4
LT
1/* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
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.
10 */
0f8053a5
NP
11#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
1da177e4 15
42b77728
JB
16void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
01ad1c08 19extern void prep_compound_page(struct page *page, unsigned long order);
18229df5 20extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
01ad1c08 21
7835e98b 22static inline void set_page_count(struct page *page, int v)
77a8a788 23{
7835e98b
NP
24 atomic_set(&page->_count, v);
25}
26
27/*
28 * Turn a non-refcounted page (->_count == 0) into refcounted with
29 * a count of one.
30 */
31static inline void set_page_refcounted(struct page *page)
32{
ae1276b9 33 VM_BUG_ON(PageTail(page));
725d704e 34 VM_BUG_ON(atomic_read(&page->_count));
77a8a788 35 set_page_count(page, 1);
77a8a788
NP
36}
37
0f8053a5
NP
38static inline void __put_page(struct page *page)
39{
40 atomic_dec(&page->_count);
41}
42
894bc310
LS
43/*
44 * in mm/vmscan.c:
45 */
62695a84 46extern int isolate_lru_page(struct page *page);
894bc310 47extern void putback_lru_page(struct page *page);
62695a84 48
894bc310
LS
49/*
50 * in mm/page_alloc.c
51 */
22b31eec 52extern unsigned long highest_memmap_pfn;
0c0a4a51 53extern void __free_pages_bootmem(struct page *page, unsigned int order);
0f8053a5 54
48f13bf3
MG
55/*
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.
59 */
60static inline unsigned long page_order(struct page *page)
61{
62 VM_BUG_ON(!PageBuddy(page));
63 return page_private(page);
64}
b5a0e011 65
ba470de4 66extern long mlock_vma_pages_range(struct vm_area_struct *vma,
b291f000 67 unsigned long start, unsigned long end);
ba470de4
RR
68extern void munlock_vma_pages_range(struct vm_area_struct *vma,
69 unsigned long start, unsigned long end);
70static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
71{
72 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
73}
b291f000 74
894bc310
LS
75#ifdef CONFIG_UNEVICTABLE_LRU
76/*
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.
81 */
82static inline void unevictable_migrate_page(struct page *new, struct page *old)
83{
84 if (TestClearPageUnevictable(old))
85 SetPageUnevictable(new);
86}
87#else
88static inline void unevictable_migrate_page(struct page *new, struct page *old)
89{
90}
91#endif
92
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NP
93#ifdef CONFIG_UNEVICTABLE_LRU
94/*
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.
98 */
99static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
100{
101 VM_BUG_ON(PageLRU(page));
102
103 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
104 return 0;
105
5344b7e6
NP
106 if (!TestSetPageMlocked(page)) {
107 inc_zone_page_state(page, NR_MLOCK);
108 count_vm_event(UNEVICTABLE_PGMLOCKED);
109 }
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NP
110 return 1;
111}
112
113/*
114 * must be called with vma's mmap_sem held for read, and page locked.
115 */
116extern void mlock_vma_page(struct page *page);
117
118/*
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.
122 *
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.
126 */
127extern void __clear_page_mlock(struct page *page);
128static inline void clear_page_mlock(struct page *page)
129{
130 if (unlikely(TestClearPageMlocked(page)))
131 __clear_page_mlock(page);
132}
133
134/*
135 * mlock_migrate_page - called only from migrate_page_copy() to
5344b7e6 136 * migrate the Mlocked page flag; update statistics.
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NP
137 */
138static inline void mlock_migrate_page(struct page *newpage, struct page *page)
139{
5344b7e6
NP
140 if (TestClearPageMlocked(page)) {
141 unsigned long flags;
142
143 local_irq_save(flags);
144 __dec_zone_page_state(page, NR_MLOCK);
b291f000 145 SetPageMlocked(newpage);
5344b7e6
NP
146 __inc_zone_page_state(newpage, NR_MLOCK);
147 local_irq_restore(flags);
148 }
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NP
149}
150
985737cf
LS
151/*
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...
155 */
156static inline void free_page_mlock(struct page *page)
157{
158 if (unlikely(TestClearPageMlocked(page))) {
159 unsigned long flags;
160
161 local_irq_save(flags);
162 __dec_zone_page_state(page, NR_MLOCK);
163 __count_vm_event(UNEVICTABLE_MLOCKFREED);
164 local_irq_restore(flags);
165 }
166}
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NP
167
168#else /* CONFIG_UNEVICTABLE_LRU */
169static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
170{
171 return 0;
172}
173static inline void clear_page_mlock(struct page *page) { }
174static inline void mlock_vma_page(struct page *page) { }
175static inline void mlock_migrate_page(struct page *new, struct page *old) { }
985737cf 176static inline void free_page_mlock(struct page *page) { }
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NP
177
178#endif /* CONFIG_UNEVICTABLE_LRU */
894bc310 179
69d177c2
AW
180/*
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.
184 */
185static inline struct page *mem_map_offset(struct page *base, int offset)
186{
187 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
188 return pfn_to_page(page_to_pfn(base) + offset);
189 return base + offset;
190}
191
192/*
193 * Iterator over all subpages withing the maximally aligned gigantic
194 * page 'base'. Handle any discontiguity in the mem_map.
195 */
196static inline struct page *mem_map_next(struct page *iter,
197 struct page *base, int offset)
198{
199 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
200 unsigned long pfn = page_to_pfn(base) + offset;
201 if (!pfn_valid(pfn))
202 return NULL;
203 return pfn_to_page(pfn);
204 }
205 return iter + 1;
206}
207
b5a0e011
AH
208/*
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.
213 */
214#ifdef CONFIG_SPARSEMEM
215#define __paginginit __meminit
216#else
217#define __paginginit __init
218#endif
219
6b74ab97
MG
220/* Memory initialisation debug and verification */
221enum mminit_level {
222 MMINIT_WARNING,
223 MMINIT_VERIFY,
224 MMINIT_TRACE
225};
226
227#ifdef CONFIG_DEBUG_MEMORY_INIT
228
229extern int mminit_loglevel;
230
231#define mminit_dprintk(level, prefix, fmt, arg...) \
232do { \
233 if (level < mminit_loglevel) { \
234 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
235 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
236 } \
237} while (0)
238
708614e6
MG
239extern void mminit_verify_pageflags_layout(void);
240extern void mminit_verify_page_links(struct page *page,
241 enum zone_type zone, unsigned long nid, unsigned long pfn);
68ad8df4 242extern void mminit_verify_zonelist(void);
708614e6 243
6b74ab97
MG
244#else
245
246static inline void mminit_dprintk(enum mminit_level level,
247 const char *prefix, const char *fmt, ...)
248{
249}
250
708614e6
MG
251static inline void mminit_verify_pageflags_layout(void)
252{
253}
254
255static inline void mminit_verify_page_links(struct page *page,
256 enum zone_type zone, unsigned long nid, unsigned long pfn)
257{
258}
68ad8df4
MG
259
260static inline void mminit_verify_zonelist(void)
261{
262}
6b74ab97 263#endif /* CONFIG_DEBUG_MEMORY_INIT */
2dbb51c4
MG
264
265/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
266#if defined(CONFIG_SPARSEMEM)
267extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
268 unsigned long *end_pfn);
269#else
270static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
271 unsigned long *end_pfn)
272{
273}
274#endif /* CONFIG_SPARSEMEM */
275
b291f000
NP
276#define GUP_FLAGS_WRITE 0x1
277#define GUP_FLAGS_FORCE 0x2
278#define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
4779280d 279#define GUP_FLAGS_IGNORE_SIGKILL 0x8
b291f000
NP
280
281int __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);
284
0f8053a5 285#endif