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 extern void prep_compound_page(struct page *page, unsigned long order);
20 extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
22 static inline void set_page_count(struct page *page, int v)
24 atomic_set(&page->_count, v);
28 * Turn a non-refcounted page (->_count == 0) into refcounted with
31 static inline void set_page_refcounted(struct page *page)
33 VM_BUG_ON(PageTail(page));
34 VM_BUG_ON(atomic_read(&page->_count));
35 set_page_count(page, 1);
38 static inline void __put_page(struct page *page)
40 atomic_dec(&page->_count);
46 extern int isolate_lru_page(struct page *page);
47 extern void putback_lru_page(struct page *page);
52 extern unsigned long highest_memmap_pfn;
53 extern void __free_pages_bootmem(struct page *page, unsigned int 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);
77 #ifdef CONFIG_UNEVICTABLE_LRU
79 * unevictable_migrate_page() called only from migrate_page_copy() to
80 * migrate unevictable flag to new page.
81 * Note that the old page has been isolated from the LRU lists at this
82 * point so we don't need to worry about LRU statistics.
84 static inline void unevictable_migrate_page(struct page *new, struct page *old)
86 if (TestClearPageUnevictable(old))
87 SetPageUnevictable(new);
90 static inline void unevictable_migrate_page(struct page *new, struct page *old)
95 #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
97 * Called only in fault path via page_evictable() for a new page
98 * to determine if it's being mapped into a LOCKED vma.
99 * If so, mark page as mlocked.
101 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
103 VM_BUG_ON(PageLRU(page));
105 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
108 if (!TestSetPageMlocked(page)) {
109 inc_zone_page_state(page, NR_MLOCK);
110 count_vm_event(UNEVICTABLE_PGMLOCKED);
116 * must be called with vma's mmap_sem held for read, and page locked.
118 extern void mlock_vma_page(struct page *page);
121 * Clear the page's PageMlocked(). This can be useful in a situation where
122 * we want to unconditionally remove a page from the pagecache -- e.g.,
123 * on truncation or freeing.
125 * It is legal to call this function for any page, mlocked or not.
126 * If called for a page that is still mapped by mlocked vmas, all we do
127 * is revert to lazy LRU behaviour -- semantics are not broken.
129 extern void __clear_page_mlock(struct page *page);
130 static inline void clear_page_mlock(struct page *page)
132 if (unlikely(TestClearPageMlocked(page)))
133 __clear_page_mlock(page);
137 * mlock_migrate_page - called only from migrate_page_copy() to
138 * migrate the Mlocked page flag; update statistics.
140 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
142 if (TestClearPageMlocked(page)) {
145 local_irq_save(flags);
146 __dec_zone_page_state(page, NR_MLOCK);
147 SetPageMlocked(newpage);
148 __inc_zone_page_state(newpage, NR_MLOCK);
149 local_irq_restore(flags);
153 #else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
154 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
158 static inline void clear_page_mlock(struct page *page) { }
159 static inline void mlock_vma_page(struct page *page) { }
160 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
162 #endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
165 * Return the mem_map entry representing the 'offset' subpage within
166 * the maximally aligned gigantic page 'base'. Handle any discontiguity
167 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
169 static inline struct page *mem_map_offset(struct page *base, int offset)
171 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
172 return pfn_to_page(page_to_pfn(base) + offset);
173 return base + offset;
177 * Iterator over all subpages withing the maximally aligned gigantic
178 * page 'base'. Handle any discontiguity in the mem_map.
180 static inline struct page *mem_map_next(struct page *iter,
181 struct page *base, int offset)
183 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
184 unsigned long pfn = page_to_pfn(base) + offset;
187 return pfn_to_page(pfn);
193 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
194 * so all functions starting at paging_init should be marked __init
195 * in those cases. SPARSEMEM, however, allows for memory hotplug,
196 * and alloc_bootmem_node is not used.
198 #ifdef CONFIG_SPARSEMEM
199 #define __paginginit __meminit
201 #define __paginginit __init
204 /* Memory initialisation debug and verification */
211 #ifdef CONFIG_DEBUG_MEMORY_INIT
213 extern int mminit_loglevel;
215 #define mminit_dprintk(level, prefix, fmt, arg...) \
217 if (level < mminit_loglevel) { \
218 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
219 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
223 extern void mminit_verify_pageflags_layout(void);
224 extern void mminit_verify_page_links(struct page *page,
225 enum zone_type zone, unsigned long nid, unsigned long pfn);
226 extern void mminit_verify_zonelist(void);
230 static inline void mminit_dprintk(enum mminit_level level,
231 const char *prefix, const char *fmt, ...)
235 static inline void mminit_verify_pageflags_layout(void)
239 static inline void mminit_verify_page_links(struct page *page,
240 enum zone_type zone, unsigned long nid, unsigned long pfn)
244 static inline void mminit_verify_zonelist(void)
247 #endif /* CONFIG_DEBUG_MEMORY_INIT */
249 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
250 #if defined(CONFIG_SPARSEMEM)
251 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
252 unsigned long *end_pfn);
254 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
255 unsigned long *end_pfn)
258 #endif /* CONFIG_SPARSEMEM */
260 #define GUP_FLAGS_WRITE 0x1
261 #define GUP_FLAGS_FORCE 0x2
262 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
263 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
265 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
266 unsigned long start, int len, int flags,
267 struct page **pages, struct vm_area_struct **vmas);