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/* internal.h: mm/ internal definitions
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
#ifndef __MM_INTERNAL_H
#define __MM_INTERNAL_H
#include <linux/mm.h>
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
static inline void set_page_count(struct page *page, int v)
atomic_set(&page->_count, v);
* Turn a non-refcounted page (->_count == 0) into refcounted with
* a count of one.
static inline void set_page_refcounted(struct page *page)
set_page_count(page, 1);
static inline void __put_page(struct page *page)
static inline void __get_page_tail_foll(struct page *page,
bool get_page_head)
* If we're getting a tail page, the elevated page->_count is
* required only in the head page and we will elevate the head
* page->_count and tail page->_mapcount.
* We elevate page_tail->_mapcount for tail pages to force
* page_tail->_count to be zero at all times to avoid getting
* false positives from get_page_unless_zero() with
* speculative page access (like in
* page_cache_get_speculative()) on tail pages.
VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
VM_BUG_ON(atomic_read(&page->_count) != 0);
VM_BUG_ON(page_mapcount(page) < 0);
if (get_page_head)
* This is meant to be called as the FOLL_GET operation of
* follow_page() and it must be called while holding the proper PT
* lock while the pte (or pmd_trans_huge) is still mapping the page.
static inline void get_page_foll(struct page *page)
if (unlikely(PageTail(page)))
* This is safe only because
* __split_huge_page_refcount() can't run under
* get_page_foll() because we hold the proper PT lock.
__get_page_tail_foll(page, true);
else {
* Getting a normal page or the head of a compound page
* requires to already have an elevated page->_count.
VM_BUG_ON(atomic_read(&page->_count) <= 0);
extern unsigned long highest_memmap_pfn;
* in mm/vmscan.c:
extern int isolate_lru_page(struct page *page);
extern void putback_lru_page(struct page *page);
* in mm/page_alloc.c
extern void __free_pages_bootmem(struct page *page, unsigned int order);
extern void prep_compound_page(struct page *page, unsigned long order);
extern bool is_free_buddy_page(struct page *page);
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
* in mm/compaction.c
* compact_control is used to track pages being migrated and the free pages
* they are being migrated to during memory compaction. The free_pfn starts
* at the end of a zone and migrate_pfn begins at the start. Movable pages
* are moved to the end of a zone during a compaction run and the run
* completes when free_pfn <= migrate_pfn
struct compact_control {
struct list_head freepages; /* List of free pages to migrate to */
struct list_head migratepages; /* List of pages being migrated */
unsigned long nr_freepages; /* Number of isolated free pages */
unsigned long nr_migratepages; /* Number of pages to migrate */
unsigned long free_pfn; /* isolate_freepages search base */
unsigned long start_free_pfn; /* where we started the search */
unsigned long migrate_pfn; /* isolate_migratepages search base */
bool sync; /* Synchronous migration */
bool wrapped; /* Order > 0 compactions are
incremental, once free_pfn
and migrate_pfn meet, we restart
from the top of the zone;
remember we wrapped around. */
int order; /* order a direct compactor needs */
int migratetype; /* MOVABLE, RECLAIMABLE etc */
struct zone *zone;
unsigned long
isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn);
unsigned long
isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
unsigned long low_pfn, unsigned long end_pfn);
* function for dealing with page's order in buddy system.
* zone->lock is already acquired when we use these.
* So, we don't need atomic page->flags operations here.
static inline unsigned long page_order(struct page *page)
/* PageBuddy() must be checked by the caller */
return page_private(page);
/* mm/util.c */
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev, struct rb_node *rb_parent);
extern long mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
* Called only in fault path via page_evictable() for a new page
* to determine if it's being mapped into a LOCKED vma.
* If so, mark page as mlocked.
static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
struct page *page)
if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
return 0;
if (!TestSetPageMlocked(page)) {
inc_zone_page_state(page, NR_MLOCK);
return 1;
* must be called with vma's mmap_sem held for read or write, and page locked.
extern void mlock_vma_page(struct page *page);
extern void munlock_vma_page(struct page *page);
* Clear the page's PageMlocked(). This can be useful in a situation where
* we want to unconditionally remove a page from the pagecache -- e.g.,
* on truncation or freeing.
* It is legal to call this function for any page, mlocked or not.
* If called for a page that is still mapped by mlocked vmas, all we do
* is revert to lazy LRU behaviour -- semantics are not broken.
extern void __clear_page_mlock(struct page *page);
static inline void clear_page_mlock(struct page *page)
if (unlikely(TestClearPageMlocked(page)))
* mlock_migrate_page - called only from migrate_page_copy() to
* migrate the Mlocked page flag; update statistics.
static inline void mlock_migrate_page(struct page *newpage, struct page *page)
if (TestClearPageMlocked(page)) {
unsigned long flags;
__dec_zone_page_state(page, NR_MLOCK);
__inc_zone_page_state(newpage, NR_MLOCK);
extern unsigned long vma_address(struct page *page,
struct vm_area_struct *vma);
#else /* !CONFIG_MMU */
static inline int mlocked_vma_newpage(struct vm_area_struct *v, struct page *p)
return 0;
static inline void clear_page_mlock(struct page *page) { }
static inline void mlock_vma_page(struct page *page) { }
static inline void mlock_migrate_page(struct page *new, struct page *old) { }
#endif /* !CONFIG_MMU */
* Return the mem_map entry representing the 'offset' subpage within
* the maximally aligned gigantic page 'base'. Handle any discontiguity
* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
static inline struct page *mem_map_offset(struct page *base, int offset)
if (unlikely(offset >= MAX_ORDER_NR_PAGES))
return pfn_to_page(page_to_pfn(base) + offset);
return base + offset;
* Iterator over all subpages within the maximally aligned gigantic
* page 'base'. Handle any discontiguity in the mem_map.
static inline struct page *mem_map_next(struct page *iter,
struct page *base, int offset)
if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
unsigned long pfn = page_to_pfn(base) + offset;
if (!pfn_valid(pfn))
return NULL;
return pfn_to_page(pfn);
return iter + 1;
* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
* so all functions starting at paging_init should be marked __init
* in those cases. SPARSEMEM, however, allows for memory hotplug,
* and alloc_bootmem_node is not used.
#define __paginginit __meminit
#define __paginginit __init
/* Memory initialisation debug and verification */
enum mminit_level {
extern int mminit_loglevel;
#define mminit_dprintk(level, prefix, fmt, arg...) \
do { \
if (level < mminit_loglevel) { \
printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
} \
} while (0)
extern void mminit_verify_pageflags_layout(void);
extern void mminit_verify_page_links(struct page *page,
enum zone_type zone, unsigned long nid, unsigned long pfn);
extern void mminit_verify_zonelist(void);
static inline void mminit_dprintk(enum mminit_level level,
const char *prefix, const char *fmt, ...)
static inline void mminit_verify_pageflags_layout(void)
static inline void mminit_verify_page_links(struct page *page,
enum zone_type zone, unsigned long nid, unsigned long pfn)
static inline void mminit_verify_zonelist(void)
/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
unsigned long *end_pfn);
static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
unsigned long *end_pfn)
extern int hwpoison_filter(struct page *p);
extern u32 hwpoison_filter_dev_major;
extern u32 hwpoison_filter_dev_minor;
extern u64 hwpoison_filter_flags_mask;
extern u64 hwpoison_filter_flags_value;
extern u64 hwpoison_filter_memcg;
extern u32 hwpoison_filter_enable;
extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
unsigned long, unsigned long,
unsigned long, unsigned long);
extern void set_pageblock_order(void);
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