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 */
11 #ifndef __MM_INTERNAL_H
12 #define __MM_INTERNAL_H
13
14 #include <linux/mm.h>
15
16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
19 static inline void set_page_count(struct page *page, int v)
20 {
21 atomic_set(&page->_count, v);
22 }
23
24 /*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
28 static inline void set_page_refcounted(struct page *page)
29 {
30 VM_BUG_ON(PageTail(page));
31 VM_BUG_ON(atomic_read(&page->_count));
32 set_page_count(page, 1);
33 }
34
35 static inline void __put_page(struct page *page)
36 {
37 atomic_dec(&page->_count);
38 }
39
40 /*
41 * in mm/vmscan.c:
42 */
43 extern int isolate_lru_page(struct page *page);
44 extern void putback_lru_page(struct page *page);
45
46 /*
47 * in mm/page_alloc.c
48 */
49 extern unsigned long highest_memmap_pfn;
50 extern void __free_pages_bootmem(struct page *page, unsigned int order);
51 extern void prep_compound_page(struct page *page, unsigned long order);
52
53
54 /*
55 * function for dealing with page's order in buddy system.
56 * zone->lock is already acquired when we use these.
57 * So, we don't need atomic page->flags operations here.
58 */
59 static inline unsigned long page_order(struct page *page)
60 {
61 VM_BUG_ON(!PageBuddy(page));
62 return page_private(page);
63 }
64
65 #ifdef CONFIG_HAVE_MLOCK
66 extern long mlock_vma_pages_range(struct vm_area_struct *vma,
67 unsigned long start, unsigned long end);
68 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
69 unsigned long start, unsigned long end);
70 static 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 }
74 #endif
75
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 */
82 static inline void unevictable_migrate_page(struct page *new, struct page *old)
83 {
84 if (TestClearPageUnevictable(old))
85 SetPageUnevictable(new);
86 }
87
88 #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
89 /*
90 * Called only in fault path via page_evictable() for a new page
91 * to determine if it's being mapped into a LOCKED vma.
92 * If so, mark page as mlocked.
93 */
94 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
95 {
96 VM_BUG_ON(PageLRU(page));
97
98 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
99 return 0;
100
101 if (!TestSetPageMlocked(page)) {
102 inc_zone_page_state(page, NR_MLOCK);
103 count_vm_event(UNEVICTABLE_PGMLOCKED);
104 }
105 return 1;
106 }
107
108 /*
109 * must be called with vma's mmap_sem held for read, and page locked.
110 */
111 extern void mlock_vma_page(struct page *page);
112
113 /*
114 * Clear the page's PageMlocked(). This can be useful in a situation where
115 * we want to unconditionally remove a page from the pagecache -- e.g.,
116 * on truncation or freeing.
117 *
118 * It is legal to call this function for any page, mlocked or not.
119 * If called for a page that is still mapped by mlocked vmas, all we do
120 * is revert to lazy LRU behaviour -- semantics are not broken.
121 */
122 extern void __clear_page_mlock(struct page *page);
123 static inline void clear_page_mlock(struct page *page)
124 {
125 if (unlikely(TestClearPageMlocked(page)))
126 __clear_page_mlock(page);
127 }
128
129 /*
130 * mlock_migrate_page - called only from migrate_page_copy() to
131 * migrate the Mlocked page flag; update statistics.
132 */
133 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
134 {
135 if (TestClearPageMlocked(page)) {
136 unsigned long flags;
137
138 local_irq_save(flags);
139 __dec_zone_page_state(page, NR_MLOCK);
140 SetPageMlocked(newpage);
141 __inc_zone_page_state(newpage, NR_MLOCK);
142 local_irq_restore(flags);
143 }
144 }
145
146 #else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
147 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
148 {
149 return 0;
150 }
151 static inline void clear_page_mlock(struct page *page) { }
152 static inline void mlock_vma_page(struct page *page) { }
153 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
154
155 #endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
156
157 /*
158 * Return the mem_map entry representing the 'offset' subpage within
159 * the maximally aligned gigantic page 'base'. Handle any discontiguity
160 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
161 */
162 static inline struct page *mem_map_offset(struct page *base, int offset)
163 {
164 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
165 return pfn_to_page(page_to_pfn(base) + offset);
166 return base + offset;
167 }
168
169 /*
170 * Iterator over all subpages withing the maximally aligned gigantic
171 * page 'base'. Handle any discontiguity in the mem_map.
172 */
173 static inline struct page *mem_map_next(struct page *iter,
174 struct page *base, int offset)
175 {
176 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
177 unsigned long pfn = page_to_pfn(base) + offset;
178 if (!pfn_valid(pfn))
179 return NULL;
180 return pfn_to_page(pfn);
181 }
182 return iter + 1;
183 }
184
185 /*
186 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
187 * so all functions starting at paging_init should be marked __init
188 * in those cases. SPARSEMEM, however, allows for memory hotplug,
189 * and alloc_bootmem_node is not used.
190 */
191 #ifdef CONFIG_SPARSEMEM
192 #define __paginginit __meminit
193 #else
194 #define __paginginit __init
195 #endif
196
197 /* Memory initialisation debug and verification */
198 enum mminit_level {
199 MMINIT_WARNING,
200 MMINIT_VERIFY,
201 MMINIT_TRACE
202 };
203
204 #ifdef CONFIG_DEBUG_MEMORY_INIT
205
206 extern int mminit_loglevel;
207
208 #define mminit_dprintk(level, prefix, fmt, arg...) \
209 do { \
210 if (level < mminit_loglevel) { \
211 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
212 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
213 } \
214 } while (0)
215
216 extern void mminit_verify_pageflags_layout(void);
217 extern void mminit_verify_page_links(struct page *page,
218 enum zone_type zone, unsigned long nid, unsigned long pfn);
219 extern void mminit_verify_zonelist(void);
220
221 #else
222
223 static inline void mminit_dprintk(enum mminit_level level,
224 const char *prefix, const char *fmt, ...)
225 {
226 }
227
228 static inline void mminit_verify_pageflags_layout(void)
229 {
230 }
231
232 static inline void mminit_verify_page_links(struct page *page,
233 enum zone_type zone, unsigned long nid, unsigned long pfn)
234 {
235 }
236
237 static inline void mminit_verify_zonelist(void)
238 {
239 }
240 #endif /* CONFIG_DEBUG_MEMORY_INIT */
241
242 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
243 #if defined(CONFIG_SPARSEMEM)
244 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
245 unsigned long *end_pfn);
246 #else
247 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
248 unsigned long *end_pfn)
249 {
250 }
251 #endif /* CONFIG_SPARSEMEM */
252
253 #define GUP_FLAGS_WRITE 0x1
254 #define GUP_FLAGS_FORCE 0x2
255 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
256 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
257
258 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
259 unsigned long start, int len, int flags,
260 struct page **pages, struct vm_area_struct **vmas);
261
262 #define ZONE_RECLAIM_NOSCAN -2
263 #define ZONE_RECLAIM_FULL -1
264 #define ZONE_RECLAIM_SOME 0
265 #define ZONE_RECLAIM_SUCCESS 1
266 #endif
267
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