[deliverable/linux.git] / mm / internal.h

/* 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/fs.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);
}

extern int __do_page_cache_readahead(struct address_space *mapping,
		struct file *filp, pgoff_t offset, unsigned long nr_to_read,
		unsigned long lookahead_size);

/*
 * Submit IO for the read-ahead request in file_ra_state.
 */
static inline unsigned long ra_submit(struct file_ra_state *ra,
		struct address_space *mapping, struct file *filp)
{
	return __do_page_cache_readahead(mapping, filp,
					ra->start, ra->size, ra->async_size);
}

/*
 * 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_PAGE(PageTail(page), page);
	VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
	set_page_count(page, 1);
}

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_PAGE(atomic_read(&page->first_page->_count) <= 0, page);
	if (get_page_head)
		atomic_inc(&page->first_page->_count);
	get_huge_page_tail(page);
}

/*
 * 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_PAGE(atomic_read(&page->_count) <= 0, page);
		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);
extern bool zone_reclaimable(struct zone *zone);

/*
 * in mm/rmap.c:
 */
extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);

/*
 * 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
extern int user_min_free_kbytes;

#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 */
	enum migrate_mode mode;		/* Async or sync migration mode */
	bool ignore_skip_hint;		/* Scan blocks even if marked skip */
	bool finished_update_free;	/* True when the zone cached pfns are
					 * no longer being updated
					 */
	bool finished_update_migrate;

	int order;			/* order a direct compactor needs */
	int migratetype;		/* MOVABLE, RECLAIMABLE etc */
	struct zone *zone;
	bool contended;			/* True if a lock was contended */
};

unsigned long
isolate_freepages_range(struct compact_control *cc,
			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, bool unevictable);

#endif

/*
 * This function returns the order of a free page in the buddy system. In
 * general, page_zone(page)->lock must be held by the caller to prevent the
 * page from being allocated in parallel and returning garbage as the order.
 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
 * page cannot be allocated or merged in parallel.
 */
static inline unsigned long page_order(struct page *page)
{
	/* PageBuddy() must be checked by the caller */
	return page_private(page);
}

static inline bool is_cow_mapping(vm_flags_t flags)
{
	return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
}

/* 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, int *nonblocking);
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);
}

/*
 * 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 unsigned int 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);

/*
 * 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;
		int nr_pages = hpage_nr_pages(page);

		local_irq_save(flags);
		__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
		SetPageMlocked(newpage);
		__mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
		local_irq_restore(flags);
	}
}

extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern unsigned long vma_address(struct page *page,
				 struct vm_area_struct *vma);
#endif
#else /* !CONFIG_MMU */
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

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);
unsigned long reclaim_clean_pages_from_list(struct zone *zone,
					    struct list_head *page_list);
/* The ALLOC_WMARK bits are used as an index to zone->watermark */
#define ALLOC_WMARK_MIN		WMARK_MIN
#define ALLOC_WMARK_LOW		WMARK_LOW
#define ALLOC_WMARK_HIGH	WMARK_HIGH
#define ALLOC_NO_WATERMARKS	0x04 /* don't check watermarks at all */

/* Mask to get the watermark bits */
#define ALLOC_WMARK_MASK	(ALLOC_NO_WATERMARKS-1)

#define ALLOC_HARDER		0x10 /* try to alloc harder */
#define ALLOC_HIGH		0x20 /* __GFP_HIGH set */
#define ALLOC_CPUSET		0x40 /* check for correct cpuset */
#define ALLOC_CMA		0x80 /* allow allocations from CMA areas */
#define ALLOC_FAIR		0x100 /* fair zone allocation */

#endif	/* __MM_INTERNAL_H */
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 (dhowells@redhat.com)
	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
29f175d1	14	#include <linux/fs.h>
0f8053a5	15	#include <linux/mm.h>
1da177e4	16
42b77728 JB	17	void free_pgtables(struct mmu_gather tlb, struct vm_area_struct start_vma,
	18	unsigned long floor, unsigned long ceiling);
	19
7835e98b	20	static inline void set_page_count(struct page *page, int v)
77a8a788	21	{
7835e98b NP	22	atomic_set(&page->_count, v);
	23	}
	24
29f175d1 FF	25	extern int __do_page_cache_readahead(struct address_space *mapping,
	26	struct file *filp, pgoff_t offset, unsigned long nr_to_read,
	27	unsigned long lookahead_size);
	28
	29	/*
	30	* Submit IO for the read-ahead request in file_ra_state.
	31	*/
	32	static inline unsigned long ra_submit(struct file_ra_state *ra,
	33	struct address_space mapping, struct file filp)
	34	{
	35	return __do_page_cache_readahead(mapping, filp,
	36	ra->start, ra->size, ra->async_size);
	37	}
	38
7835e98b NP	39	/*
	40	* Turn a non-refcounted page (->_count == 0) into refcounted with
	41	* a count of one.
	42	*/
	43	static inline void set_page_refcounted(struct page *page)
	44	{
309381fe SL	45	VM_BUG_ON_PAGE(PageTail(page), page);
309381fe SL	46	VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
77a8a788	47	set_page_count(page, 1);
77a8a788 NP	48	}
77a8a788 NP	49
70b50f94 AA	50	static inline void __get_page_tail_foll(struct page *page,
	51	bool get_page_head)
	52	{
	53	/*
	54	* If we're getting a tail page, the elevated page->_count is
	55	* required only in the head page and we will elevate the head
	56	* page->_count and tail page->_mapcount.
	57	*
	58	* We elevate page_tail->_mapcount for tail pages to force
	59	* page_tail->_count to be zero at all times to avoid getting
	60	* false positives from get_page_unless_zero() with
	61	* speculative page access (like in
	62	* page_cache_get_speculative()) on tail pages.
	63	*/
309381fe	64	VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page);
70b50f94 AA	65	if (get_page_head)
70b50f94 AA	66	atomic_inc(&page->first_page->_count);
c728852f	67	get_huge_page_tail(page);
70b50f94 AA	68	}
	69
	70	/*
	71	* This is meant to be called as the FOLL_GET operation of
	72	* follow_page() and it must be called while holding the proper PT
	73	* lock while the pte (or pmd_trans_huge) is still mapping the page.
	74	*/
	75	static inline void get_page_foll(struct page *page)
	76	{
	77	if (unlikely(PageTail(page)))
	78	/*
	79	* This is safe only because
	80	* __split_huge_page_refcount() can't run under
	81	* get_page_foll() because we hold the proper PT lock.
	82	*/
	83	__get_page_tail_foll(page, true);
	84	else {
	85	/*
	86	* Getting a normal page or the head of a compound page
	87	* requires to already have an elevated page->_count.
	88	*/
309381fe	89	VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
70b50f94 AA	90	atomic_inc(&page->_count);
	91	}
	92	}
	93
03f6462a HD	94	extern unsigned long highest_memmap_pfn;
03f6462a HD	95
894bc310 LS	96	/*
	97	* in mm/vmscan.c:
	98	*/
62695a84	99	extern int isolate_lru_page(struct page *page);
894bc310	100	extern void putback_lru_page(struct page *page);
6e543d57	101	extern bool zone_reclaimable(struct zone *zone);
62695a84	102
6219049a BL	103	/*
	104	* in mm/rmap.c:
	105	*/
	106	extern pmd_t mm_find_pmd(struct mm_struct mm, unsigned long address);
	107
894bc310 LS	108	/*
	109	* in mm/page_alloc.c
	110	*/
0c0a4a51	111	extern void __free_pages_bootmem(struct page *page, unsigned int order);
20a0307c	112	extern void prep_compound_page(struct page *page, unsigned long order);
8d22ba1b WF	113	#ifdef CONFIG_MEMORY_FAILURE
	114	extern bool is_free_buddy_page(struct page *page);
	115	#endif
42aa83cb	116	extern int user_min_free_kbytes;
20a0307c	117
ff9543fd MN	118	#if defined CONFIG_COMPACTION \|\| defined CONFIG_CMA
	119
	120	/*
	121	* in mm/compaction.c
	122	*/
	123	/*
	124	* compact_control is used to track pages being migrated and the free pages
	125	* they are being migrated to during memory compaction. The free_pfn starts
	126	* at the end of a zone and migrate_pfn begins at the start. Movable pages
	127	* are moved to the end of a zone during a compaction run and the run
	128	* completes when free_pfn <= migrate_pfn
	129	*/
	130	struct compact_control {
	131	struct list_head freepages; /* List of free pages to migrate to */
	132	struct list_head migratepages; /* List of pages being migrated */
	133	unsigned long nr_freepages; /* Number of isolated free pages */
	134	unsigned long nr_migratepages; /* Number of pages to migrate */
	135	unsigned long free_pfn; /* isolate_freepages search base */
	136	unsigned long migrate_pfn; /* isolate_migratepages search base */
e0b9daeb	137	enum migrate_mode mode; /* Async or sync migration mode */
bb13ffeb	138	bool ignore_skip_hint; /* Scan blocks even if marked skip */
c89511ab MG	139	bool finished_update_free; /* True when the zone cached pfns are
	140	* no longer being updated
	141	*/
	142	bool finished_update_migrate;
ff9543fd MN	143
	144	int order; /* order a direct compactor needs */
	145	int migratetype; /* MOVABLE, RECLAIMABLE etc */
	146	struct zone *zone;
e64c5237	147	bool contended; /* True if a lock was contended */
ff9543fd MN	148	};
	149
	150	unsigned long
bb13ffeb MG	151	isolate_freepages_range(struct compact_control *cc,
bb13ffeb MG	152	unsigned long start_pfn, unsigned long end_pfn);
ff9543fd MN	153	unsigned long
ff9543fd MN	154	isolate_migratepages_range(struct zone zone, struct compact_control cc,
e46a2879	155	unsigned long low_pfn, unsigned long end_pfn, bool unevictable);
ff9543fd MN	156
ff9543fd MN	157	#endif
0f8053a5	158
48f13bf3	159	/*
6c14466c MG	160	* This function returns the order of a free page in the buddy system. In
	161	* general, page_zone(page)->lock must be held by the caller to prevent the
	162	* page from being allocated in parallel and returning garbage as the order.
	163	* If a caller does not hold page_zone(page)->lock, it must guarantee that the
	164	* page cannot be allocated or merged in parallel.
48f13bf3 MG	165	*/
	166	static inline unsigned long page_order(struct page *page)
	167	{
572438f9	168	/* PageBuddy() must be checked by the caller */
48f13bf3 MG	169	return page_private(page);
48f13bf3 MG	170	}
b5a0e011	171
4bbd4c77 KS	172	static inline bool is_cow_mapping(vm_flags_t flags)
	173	{
	174	return (flags & (VM_SHARED \| VM_MAYWRITE)) == VM_MAYWRITE;
	175	}
	176
6038def0 NK	177	/* mm/util.c */
	178	void __vma_link_list(struct mm_struct mm, struct vm_area_struct vma,
	179	struct vm_area_struct prev, struct rb_node rb_parent);
	180
af8e3354	181	#ifdef CONFIG_MMU
cea10a19 ML	182	extern long __mlock_vma_pages_range(struct vm_area_struct *vma,
cea10a19 ML	183	unsigned long start, unsigned long end, int *nonblocking);
af8e3354 HD	184	extern void munlock_vma_pages_range(struct vm_area_struct *vma,
	185	unsigned long start, unsigned long end);
	186	static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
	187	{
	188	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
	189	}
	190
b291f000	191	/*
73848b46	192	* must be called with vma's mmap_sem held for read or write, and page locked.
b291f000 NP	193	*/
b291f000 NP	194	extern void mlock_vma_page(struct page *page);
ff6a6da6	195	extern unsigned int munlock_vma_page(struct page *page);
b291f000 NP	196
	197	/*
	198	* Clear the page's PageMlocked(). This can be useful in a situation where
	199	* we want to unconditionally remove a page from the pagecache -- e.g.,
	200	* on truncation or freeing.
	201	*
	202	* It is legal to call this function for any page, mlocked or not.
	203	* If called for a page that is still mapped by mlocked vmas, all we do
	204	* is revert to lazy LRU behaviour -- semantics are not broken.
	205	*/
e6c509f8	206	extern void clear_page_mlock(struct page *page);
b291f000 NP	207
	208	/*
	209	* mlock_migrate_page - called only from migrate_page_copy() to
5344b7e6	210	* migrate the Mlocked page flag; update statistics.
b291f000 NP	211	*/
	212	static inline void mlock_migrate_page(struct page newpage, struct page page)
	213	{
5344b7e6 NP	214	if (TestClearPageMlocked(page)) {
5344b7e6 NP	215	unsigned long flags;
b32967ff	216	int nr_pages = hpage_nr_pages(page);
5344b7e6 NP	217
5344b7e6 NP	218	local_irq_save(flags);
b32967ff	219	__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
b291f000	220	SetPageMlocked(newpage);
b32967ff	221	__mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
5344b7e6 NP	222	local_irq_restore(flags);
5344b7e6 NP	223	}
b291f000 NP	224	}
b291f000 NP	225
b32967ff MG	226	extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
b32967ff MG	227
71e3aac0 AA	228	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	229	extern unsigned long vma_address(struct page *page,
	230	struct vm_area_struct *vma);
	231	#endif
af8e3354	232	#else /* !CONFIG_MMU */
b291f000 NP	233	static inline void clear_page_mlock(struct page *page) { }
	234	static inline void mlock_vma_page(struct page *page) { }
	235	static inline void mlock_migrate_page(struct page new, struct page old) { }
	236
af8e3354	237	#endif /* !CONFIG_MMU */
894bc310	238
69d177c2 AW	239	/*
	240	* Return the mem_map entry representing the 'offset' subpage within
	241	* the maximally aligned gigantic page 'base'. Handle any discontiguity
	242	* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
	243	*/
	244	static inline struct page mem_map_offset(struct page base, int offset)
	245	{
	246	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
	247	return pfn_to_page(page_to_pfn(base) + offset);
	248	return base + offset;
	249	}
	250
	251	/*
25985edc	252	* Iterator over all subpages within the maximally aligned gigantic
69d177c2 AW	253	* page 'base'. Handle any discontiguity in the mem_map.
	254	*/
	255	static inline struct page mem_map_next(struct page iter,
	256	struct page *base, int offset)
	257	{
	258	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
	259	unsigned long pfn = page_to_pfn(base) + offset;
	260	if (!pfn_valid(pfn))
	261	return NULL;
	262	return pfn_to_page(pfn);
	263	}
	264	return iter + 1;
	265	}
	266
b5a0e011 AH	267	/*
	268	* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
	269	* so all functions starting at paging_init should be marked __init
	270	* in those cases. SPARSEMEM, however, allows for memory hotplug,
	271	* and alloc_bootmem_node is not used.
	272	*/
	273	#ifdef CONFIG_SPARSEMEM
	274	#define __paginginit __meminit
	275	#else
	276	#define __paginginit __init
	277	#endif
	278
6b74ab97 MG	279	/* Memory initialisation debug and verification */
	280	enum mminit_level {
	281	MMINIT_WARNING,
	282	MMINIT_VERIFY,
	283	MMINIT_TRACE
	284	};
	285
	286	#ifdef CONFIG_DEBUG_MEMORY_INIT
	287
	288	extern int mminit_loglevel;
	289
	290	#define mminit_dprintk(level, prefix, fmt, arg...) \
	291	do { \
	292	if (level < mminit_loglevel) { \
	293	printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
	294	printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
	295	} \
	296	} while (0)
	297
708614e6 MG	298	extern void mminit_verify_pageflags_layout(void);
	299	extern void mminit_verify_page_links(struct page *page,
	300	enum zone_type zone, unsigned long nid, unsigned long pfn);
68ad8df4	301	extern void mminit_verify_zonelist(void);
708614e6	302
6b74ab97 MG	303	#else
	304
	305	static inline void mminit_dprintk(enum mminit_level level,
	306	const char prefix, const char fmt, ...)
	307	{
	308	}
	309
708614e6 MG	310	static inline void mminit_verify_pageflags_layout(void)
	311	{
	312	}
	313
	314	static inline void mminit_verify_page_links(struct page *page,
	315	enum zone_type zone, unsigned long nid, unsigned long pfn)
	316	{
	317	}
68ad8df4 MG	318
	319	static inline void mminit_verify_zonelist(void)
	320	{
	321	}
6b74ab97	322	#endif /* CONFIG_DEBUG_MEMORY_INIT */
2dbb51c4 MG	323
	324	/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
	325	#if defined(CONFIG_SPARSEMEM)
	326	extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	327	unsigned long *end_pfn);
	328	#else
	329	static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	330	unsigned long *end_pfn)
	331	{
	332	}
	333	#endif /* CONFIG_SPARSEMEM */
	334
fa5e084e MG	335	#define ZONE_RECLAIM_NOSCAN -2
	336	#define ZONE_RECLAIM_FULL -1
	337	#define ZONE_RECLAIM_SOME 0
	338	#define ZONE_RECLAIM_SUCCESS 1
7c116f2b	339
31d3d348 WF	340	extern int hwpoison_filter(struct page *p);
31d3d348 WF	341
7c116f2b WF	342	extern u32 hwpoison_filter_dev_major;
7c116f2b WF	343	extern u32 hwpoison_filter_dev_minor;
478c5ffc WF	344	extern u64 hwpoison_filter_flags_mask;
478c5ffc WF	345	extern u64 hwpoison_filter_flags_value;
4fd466eb	346	extern u64 hwpoison_filter_memcg;
1bfe5feb	347	extern u32 hwpoison_filter_enable;
eb36c587 AV	348
	349	extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
	350	unsigned long, unsigned long,
	351	unsigned long, unsigned long);
ca57df79 XQ	352
ca57df79 XQ	353	extern void set_pageblock_order(void);
02c6de8d MK	354	unsigned long reclaim_clean_pages_from_list(struct zone *zone,
02c6de8d MK	355	struct list_head *page_list);
d95ea5d1 BZ	356	/* The ALLOC_WMARK bits are used as an index to zone->watermark */
	357	#define ALLOC_WMARK_MIN WMARK_MIN
	358	#define ALLOC_WMARK_LOW WMARK_LOW
	359	#define ALLOC_WMARK_HIGH WMARK_HIGH
	360	#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
	361
	362	/* Mask to get the watermark bits */
	363	#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
	364
	365	#define ALLOC_HARDER 0x10 /* try to alloc harder */
	366	#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
	367	#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
	368	#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
3a025760	369	#define ALLOC_FAIR 0x100 /* fair zone allocation */
d95ea5d1	370
db971418	371	#endif /* __MM_INTERNAL_H */