[linux.git] / mm / internal.h

/* internal.h: mm/ internal definitions
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * 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);
}

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)
		atomic_inc(&page->first_page->_count);
	atomic_inc(&page->_mapcount);
}

/*
 * 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);
		atomic_inc(&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

#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 migrate_pfn;	/* isolate_migratepages search base */
	bool sync;			/* Synchronous migration */

	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);

#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);
}

/* 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);

#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 mlocked_vma_newpage(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 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.
 */
#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 */

#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;

extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
        unsigned long, unsigned long,
        unsigned long, unsigned long);
Commit	Line	Data
1da177e4 LT	1	/* internal.h: mm/ internal definitions
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells ([email protected])
	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	*/
0f8053a5 NP	11	#ifndef __MM_INTERNAL_H
	12	#define __MM_INTERNAL_H
	13
	14	#include <linux/mm.h>
1da177e4	15
42b77728 JB	16	void free_pgtables(struct mmu_gather tlb, struct vm_area_struct start_vma,
	17	unsigned long floor, unsigned long ceiling);
	18
7835e98b	19	static inline void set_page_count(struct page *page, int v)
77a8a788	20	{
7835e98b NP	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	{
ae1276b9	30	VM_BUG_ON(PageTail(page));
725d704e	31	VM_BUG_ON(atomic_read(&page->_count));
77a8a788	32	set_page_count(page, 1);
77a8a788 NP	33	}
77a8a788 NP	34
0f8053a5 NP	35	static inline void __put_page(struct page *page)
	36	{
	37	atomic_dec(&page->_count);
	38	}
	39
70b50f94 AA	40	static inline void __get_page_tail_foll(struct page *page,
	41	bool get_page_head)
	42	{
	43	/*
	44	* If we're getting a tail page, the elevated page->_count is
	45	* required only in the head page and we will elevate the head
	46	* page->_count and tail page->_mapcount.
	47	*
	48	* We elevate page_tail->_mapcount for tail pages to force
	49	* page_tail->_count to be zero at all times to avoid getting
	50	* false positives from get_page_unless_zero() with
	51	* speculative page access (like in
	52	* page_cache_get_speculative()) on tail pages.
	53	*/
	54	VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
	55	VM_BUG_ON(atomic_read(&page->_count) != 0);
	56	VM_BUG_ON(page_mapcount(page) < 0);
	57	if (get_page_head)
	58	atomic_inc(&page->first_page->_count);
	59	atomic_inc(&page->_mapcount);
	60	}
	61
	62	/*
	63	* This is meant to be called as the FOLL_GET operation of
	64	* follow_page() and it must be called while holding the proper PT
	65	* lock while the pte (or pmd_trans_huge) is still mapping the page.
	66	*/
	67	static inline void get_page_foll(struct page *page)
	68	{
	69	if (unlikely(PageTail(page)))
	70	/*
	71	* This is safe only because
	72	* __split_huge_page_refcount() can't run under
	73	* get_page_foll() because we hold the proper PT lock.
	74	*/
	75	__get_page_tail_foll(page, true);
	76	else {
	77	/*
	78	* Getting a normal page or the head of a compound page
	79	* requires to already have an elevated page->_count.
	80	*/
	81	VM_BUG_ON(atomic_read(&page->_count) <= 0);
	82	atomic_inc(&page->_count);
	83	}
	84	}
	85
03f6462a HD	86	extern unsigned long highest_memmap_pfn;
03f6462a HD	87
894bc310 LS	88	/*
	89	* in mm/vmscan.c:
	90	*/
62695a84	91	extern int isolate_lru_page(struct page *page);
894bc310	92	extern void putback_lru_page(struct page *page);
62695a84	93
894bc310 LS	94	/*
	95	* in mm/page_alloc.c
	96	*/
0c0a4a51	97	extern void __free_pages_bootmem(struct page *page, unsigned int order);
20a0307c	98	extern void prep_compound_page(struct page *page, unsigned long order);
8d22ba1b WF	99	#ifdef CONFIG_MEMORY_FAILURE
	100	extern bool is_free_buddy_page(struct page *page);
	101	#endif
20a0307c	102
ff9543fd MN	103	#if defined CONFIG_COMPACTION \|\| defined CONFIG_CMA
	104
	105	/*
	106	* in mm/compaction.c
	107	*/
	108	/*
	109	* compact_control is used to track pages being migrated and the free pages
	110	* they are being migrated to during memory compaction. The free_pfn starts
	111	* at the end of a zone and migrate_pfn begins at the start. Movable pages
	112	* are moved to the end of a zone during a compaction run and the run
	113	* completes when free_pfn <= migrate_pfn
	114	*/
	115	struct compact_control {
	116	struct list_head freepages; /* List of free pages to migrate to */
	117	struct list_head migratepages; /* List of pages being migrated */
	118	unsigned long nr_freepages; /* Number of isolated free pages */
	119	unsigned long nr_migratepages; /* Number of pages to migrate */
	120	unsigned long free_pfn; /* isolate_freepages search base */
	121	unsigned long migrate_pfn; /* isolate_migratepages search base */
68e3e926	122	bool sync; /* Synchronous migration */
ff9543fd MN	123
	124	int order; /* order a direct compactor needs */
	125	int migratetype; /* MOVABLE, RECLAIMABLE etc */
	126	struct zone *zone;
	127	};
	128
	129	unsigned long
	130	isolate_freepages_range(unsigned long start_pfn, unsigned long end_pfn);
	131	unsigned long
	132	isolate_migratepages_range(struct zone zone, struct compact_control cc,
	133	unsigned long low_pfn, unsigned long end_pfn);
	134
	135	#endif
0f8053a5	136
48f13bf3 MG	137	/*
	138	* function for dealing with page's order in buddy system.
	139	* zone->lock is already acquired when we use these.
	140	* So, we don't need atomic page->flags operations here.
	141	*/
	142	static inline unsigned long page_order(struct page *page)
	143	{
572438f9	144	/* PageBuddy() must be checked by the caller */
48f13bf3 MG	145	return page_private(page);
48f13bf3 MG	146	}
b5a0e011	147
6038def0 NK	148	/* mm/util.c */
	149	void __vma_link_list(struct mm_struct mm, struct vm_area_struct vma,
	150	struct vm_area_struct prev, struct rb_node rb_parent);
	151
af8e3354 HD	152	#ifdef CONFIG_MMU
	153	extern long mlock_vma_pages_range(struct vm_area_struct *vma,
	154	unsigned long start, unsigned long end);
	155	extern void munlock_vma_pages_range(struct vm_area_struct *vma,
	156	unsigned long start, unsigned long end);
	157	static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
	158	{
	159	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
	160	}
	161
b291f000 NP	162	/*
	163	* Called only in fault path via page_evictable() for a new page
	164	* to determine if it's being mapped into a LOCKED vma.
	165	* If so, mark page as mlocked.
	166	*/
096a7cf4 YH	167	static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
096a7cf4 YH	168	struct page *page)
b291f000 NP	169	{
	170	VM_BUG_ON(PageLRU(page));
	171
	172	if (likely((vma->vm_flags & (VM_LOCKED \| VM_SPECIAL)) != VM_LOCKED))
	173	return 0;
	174
5344b7e6 NP	175	if (!TestSetPageMlocked(page)) {
	176	inc_zone_page_state(page, NR_MLOCK);
	177	count_vm_event(UNEVICTABLE_PGMLOCKED);
	178	}
b291f000 NP	179	return 1;
	180	}
	181
	182	/*
73848b46	183	* must be called with vma's mmap_sem held for read or write, and page locked.
b291f000 NP	184	*/
b291f000 NP	185	extern void mlock_vma_page(struct page *page);
73848b46	186	extern void munlock_vma_page(struct page *page);
b291f000 NP	187
	188	/*
	189	* Clear the page's PageMlocked(). This can be useful in a situation where
	190	* we want to unconditionally remove a page from the pagecache -- e.g.,
	191	* on truncation or freeing.
	192	*
	193	* It is legal to call this function for any page, mlocked or not.
	194	* If called for a page that is still mapped by mlocked vmas, all we do
	195	* is revert to lazy LRU behaviour -- semantics are not broken.
	196	*/
	197	extern void __clear_page_mlock(struct page *page);
	198	static inline void clear_page_mlock(struct page *page)
	199	{
	200	if (unlikely(TestClearPageMlocked(page)))
	201	__clear_page_mlock(page);
	202	}
	203
	204	/*
	205	* mlock_migrate_page - called only from migrate_page_copy() to
5344b7e6	206	* migrate the Mlocked page flag; update statistics.
b291f000 NP	207	*/
	208	static inline void mlock_migrate_page(struct page newpage, struct page page)
	209	{
5344b7e6 NP	210	if (TestClearPageMlocked(page)) {
	211	unsigned long flags;
	212
	213	local_irq_save(flags);
	214	__dec_zone_page_state(page, NR_MLOCK);
b291f000	215	SetPageMlocked(newpage);
5344b7e6 NP	216	__inc_zone_page_state(newpage, NR_MLOCK);
	217	local_irq_restore(flags);
	218	}
b291f000 NP	219	}
b291f000 NP	220
71e3aac0 AA	221	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	222	extern unsigned long vma_address(struct page *page,
	223	struct vm_area_struct *vma);
	224	#endif
af8e3354	225	#else /* !CONFIG_MMU */
096a7cf4	226	static inline int mlocked_vma_newpage(struct vm_area_struct v, struct page p)
b291f000 NP	227	{
	228	return 0;
	229	}
	230	static inline void clear_page_mlock(struct page *page) { }
	231	static inline void mlock_vma_page(struct page *page) { }
	232	static inline void mlock_migrate_page(struct page new, struct page old) { }
	233
af8e3354	234	#endif /* !CONFIG_MMU */
894bc310	235
69d177c2 AW	236	/*
	237	* Return the mem_map entry representing the 'offset' subpage within
	238	* the maximally aligned gigantic page 'base'. Handle any discontiguity
	239	* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
	240	*/
	241	static inline struct page mem_map_offset(struct page base, int offset)
	242	{
	243	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
	244	return pfn_to_page(page_to_pfn(base) + offset);
	245	return base + offset;
	246	}
	247
	248	/*
25985edc	249	* Iterator over all subpages within the maximally aligned gigantic
69d177c2 AW	250	* page 'base'. Handle any discontiguity in the mem_map.
	251	*/
	252	static inline struct page mem_map_next(struct page iter,
	253	struct page *base, int offset)
	254	{
	255	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
	256	unsigned long pfn = page_to_pfn(base) + offset;
	257	if (!pfn_valid(pfn))
	258	return NULL;
	259	return pfn_to_page(pfn);
	260	}
	261	return iter + 1;
	262	}
	263
b5a0e011 AH	264	/*
	265	* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
	266	* so all functions starting at paging_init should be marked __init
	267	* in those cases. SPARSEMEM, however, allows for memory hotplug,
	268	* and alloc_bootmem_node is not used.
	269	*/
	270	#ifdef CONFIG_SPARSEMEM
	271	#define __paginginit __meminit
	272	#else
	273	#define __paginginit __init
	274	#endif
	275
6b74ab97 MG	276	/* Memory initialisation debug and verification */
	277	enum mminit_level {
	278	MMINIT_WARNING,
	279	MMINIT_VERIFY,
	280	MMINIT_TRACE
	281	};
	282
	283	#ifdef CONFIG_DEBUG_MEMORY_INIT
	284
	285	extern int mminit_loglevel;
	286
	287	#define mminit_dprintk(level, prefix, fmt, arg...) \
	288	do { \
	289	if (level < mminit_loglevel) { \
	290	printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
	291	printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
	292	} \
	293	} while (0)
	294
708614e6 MG	295	extern void mminit_verify_pageflags_layout(void);
	296	extern void mminit_verify_page_links(struct page *page,
	297	enum zone_type zone, unsigned long nid, unsigned long pfn);
68ad8df4	298	extern void mminit_verify_zonelist(void);
708614e6	299
6b74ab97 MG	300	#else
	301
	302	static inline void mminit_dprintk(enum mminit_level level,
	303	const char prefix, const char fmt, ...)
	304	{
	305	}
	306
708614e6 MG	307	static inline void mminit_verify_pageflags_layout(void)
	308	{
	309	}
	310
	311	static inline void mminit_verify_page_links(struct page *page,
	312	enum zone_type zone, unsigned long nid, unsigned long pfn)
	313	{
	314	}
68ad8df4 MG	315
	316	static inline void mminit_verify_zonelist(void)
	317	{
	318	}
6b74ab97	319	#endif /* CONFIG_DEBUG_MEMORY_INIT */
2dbb51c4 MG	320
	321	/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
	322	#if defined(CONFIG_SPARSEMEM)
	323	extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	324	unsigned long *end_pfn);
	325	#else
	326	static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	327	unsigned long *end_pfn)
	328	{
	329	}
	330	#endif /* CONFIG_SPARSEMEM */
	331
fa5e084e MG	332	#define ZONE_RECLAIM_NOSCAN -2
	333	#define ZONE_RECLAIM_FULL -1
	334	#define ZONE_RECLAIM_SOME 0
	335	#define ZONE_RECLAIM_SUCCESS 1
0f8053a5	336	#endif
7c116f2b	337
31d3d348 WF	338	extern int hwpoison_filter(struct page *p);
31d3d348 WF	339
7c116f2b WF	340	extern u32 hwpoison_filter_dev_major;
7c116f2b WF	341	extern u32 hwpoison_filter_dev_minor;
478c5ffc WF	342	extern u64 hwpoison_filter_flags_mask;
478c5ffc WF	343	extern u64 hwpoison_filter_flags_value;
4fd466eb	344	extern u64 hwpoison_filter_memcg;
1bfe5feb	345	extern u32 hwpoison_filter_enable;
eb36c587 AV	346
	347	extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
	348	unsigned long, unsigned long,
	349	unsigned long, unsigned long);