267 lines
7.3 KiB
C
267 lines
7.3 KiB
C
/* internal.h: mm/ internal definitions
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* 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)
|
|
{
|
|
VM_BUG_ON(PageTail(page));
|
|
VM_BUG_ON(atomic_read(&page->_count));
|
|
set_page_count(page, 1);
|
|
}
|
|
|
|
static inline void __put_page(struct page *page)
|
|
{
|
|
atomic_dec(&page->_count);
|
|
}
|
|
|
|
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);
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
extern bool is_free_buddy_page(struct page *page);
|
|
#endif
|
|
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
#ifdef CONFIG_MMU
|
|
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 is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
|
|
{
|
|
VM_BUG_ON(PageLRU(page));
|
|
|
|
if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
|
|
return 0;
|
|
|
|
if (!TestSetPageMlocked(page)) {
|
|
inc_zone_page_state(page, NR_MLOCK);
|
|
count_vm_event(UNEVICTABLE_PGMLOCKED);
|
|
}
|
|
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)))
|
|
__clear_page_mlock(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;
|
|
|
|
local_irq_save(flags);
|
|
__dec_zone_page_state(page, NR_MLOCK);
|
|
SetPageMlocked(newpage);
|
|
__inc_zone_page_state(newpage, NR_MLOCK);
|
|
local_irq_restore(flags);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
extern unsigned long vma_address(struct page *page,
|
|
struct vm_area_struct *vma);
|
|
#endif
|
|
#else /* !CONFIG_MMU */
|
|
static inline int is_mlocked_vma(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 withing 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.
|
|
*/
|
|
#ifdef CONFIG_SPARSEMEM
|
|
#define __paginginit __meminit
|
|
#else
|
|
#define __paginginit __init
|
|
#endif
|
|
|
|
/* Memory initialisation debug and verification */
|
|
enum mminit_level {
|
|
MMINIT_WARNING,
|
|
MMINIT_VERIFY,
|
|
MMINIT_TRACE
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_MEMORY_INIT
|
|
|
|
extern int mminit_loglevel;
|
|
|
|
#define mminit_dprintk(level, prefix, fmt, arg...) \
|
|
do { \
|
|
if (level < mminit_loglevel) { \
|
|
printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
|
|
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);
|
|
|
|
#else
|
|
|
|
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)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DEBUG_MEMORY_INIT */
|
|
|
|
/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
|
|
#if defined(CONFIG_SPARSEMEM)
|
|
extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
|
|
unsigned long *end_pfn);
|
|
#else
|
|
static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
|
|
unsigned long *end_pfn)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SPARSEMEM */
|
|
|
|
int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
|
|
unsigned long start, int len, unsigned int foll_flags,
|
|
struct page **pages, struct vm_area_struct **vmas,
|
|
int *nonblocking);
|
|
|
|
#define ZONE_RECLAIM_NOSCAN -2
|
|
#define ZONE_RECLAIM_FULL -1
|
|
#define ZONE_RECLAIM_SOME 0
|
|
#define ZONE_RECLAIM_SUCCESS 1
|
|
#endif
|
|
|
|
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;
|