mm/internal.h - kernel/msm - Gitiles

 /* 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);
 	}
 }

 #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;
	/* 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);
	}
	}

	#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;