[mirror_ubuntu-bionic-kernel.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/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 __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);
	if (compound_tail_refcounted(page->first_page))
		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);
extern unsigned long zone_reclaimable_pages(struct zone *zone);
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

#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 */
	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

/*
 * 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, 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);
}

/*
 * Called only in fault path, to determine if a new page is being
 * mapped into a LOCKED vma.  If it is, 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)) {
		mod_zone_page_state(page_zone(page), NR_MLOCK,
				    hpage_nr_pages(page));
		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 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 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

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 */

#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
	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
70b50f94 AA	35	static inline void __get_page_tail_foll(struct page *page,
	36	bool get_page_head)
	37	{
	38	/*
	39	* If we're getting a tail page, the elevated page->_count is
	40	* required only in the head page and we will elevate the head
	41	* page->_count and tail page->_mapcount.
	42	*
	43	* We elevate page_tail->_mapcount for tail pages to force
	44	* page_tail->_count to be zero at all times to avoid getting
	45	* false positives from get_page_unless_zero() with
	46	* speculative page access (like in
	47	* page_cache_get_speculative()) on tail pages.
	48	*/
	49	VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
	50	VM_BUG_ON(atomic_read(&page->_count) != 0);
	51	VM_BUG_ON(page_mapcount(page) < 0);
	52	if (get_page_head)
	53	atomic_inc(&page->first_page->_count);
44518d2b AA	54	if (compound_tail_refcounted(page->first_page))
44518d2b AA	55	atomic_inc(&page->_mapcount);
70b50f94 AA	56	}
	57
	58	/*
	59	* This is meant to be called as the FOLL_GET operation of
	60	* follow_page() and it must be called while holding the proper PT
	61	* lock while the pte (or pmd_trans_huge) is still mapping the page.
	62	*/
	63	static inline void get_page_foll(struct page *page)
	64	{
	65	if (unlikely(PageTail(page)))
	66	/*
	67	* This is safe only because
	68	* __split_huge_page_refcount() can't run under
	69	* get_page_foll() because we hold the proper PT lock.
	70	*/
	71	__get_page_tail_foll(page, true);
	72	else {
	73	/*
	74	* Getting a normal page or the head of a compound page
	75	* requires to already have an elevated page->_count.
	76	*/
	77	VM_BUG_ON(atomic_read(&page->_count) <= 0);
	78	atomic_inc(&page->_count);
	79	}
	80	}
	81
03f6462a HD	82	extern unsigned long highest_memmap_pfn;
03f6462a HD	83
894bc310 LS	84	/*
	85	* in mm/vmscan.c:
	86	*/
62695a84	87	extern int isolate_lru_page(struct page *page);
894bc310	88	extern void putback_lru_page(struct page *page);
6e543d57 LD	89	extern unsigned long zone_reclaimable_pages(struct zone *zone);
6e543d57 LD	90	extern bool zone_reclaimable(struct zone *zone);
62695a84	91
6219049a BL	92	/*
	93	* in mm/rmap.c:
	94	*/
	95	extern pmd_t mm_find_pmd(struct mm_struct mm, unsigned long address);
	96
894bc310 LS	97	/*
	98	* in mm/page_alloc.c
	99	*/
0c0a4a51	100	extern void __free_pages_bootmem(struct page *page, unsigned int order);
20a0307c	101	extern void prep_compound_page(struct page *page, unsigned long order);
8d22ba1b WF	102	#ifdef CONFIG_MEMORY_FAILURE
	103	extern bool is_free_buddy_page(struct page *page);
	104	#endif
20a0307c	105
ff9543fd MN	106	#if defined CONFIG_COMPACTION \|\| defined CONFIG_CMA
	107
	108	/*
	109	* in mm/compaction.c
	110	*/
	111	/*
	112	* compact_control is used to track pages being migrated and the free pages
	113	* they are being migrated to during memory compaction. The free_pfn starts
	114	* at the end of a zone and migrate_pfn begins at the start. Movable pages
	115	* are moved to the end of a zone during a compaction run and the run
	116	* completes when free_pfn <= migrate_pfn
	117	*/
	118	struct compact_control {
	119	struct list_head freepages; /* List of free pages to migrate to */
	120	struct list_head migratepages; /* List of pages being migrated */
	121	unsigned long nr_freepages; /* Number of isolated free pages */
	122	unsigned long nr_migratepages; /* Number of pages to migrate */
	123	unsigned long free_pfn; /* isolate_freepages search base */
	124	unsigned long migrate_pfn; /* isolate_migratepages search base */
68e3e926	125	bool sync; /* Synchronous migration */
bb13ffeb	126	bool ignore_skip_hint; /* Scan blocks even if marked skip */
c89511ab MG	127	bool finished_update_free; /* True when the zone cached pfns are
	128	* no longer being updated
	129	*/
	130	bool finished_update_migrate;
ff9543fd MN	131
	132	int order; /* order a direct compactor needs */
	133	int migratetype; /* MOVABLE, RECLAIMABLE etc */
	134	struct zone *zone;
e64c5237	135	bool contended; /* True if a lock was contended */
ff9543fd MN	136	};
	137
	138	unsigned long
bb13ffeb MG	139	isolate_freepages_range(struct compact_control *cc,
bb13ffeb MG	140	unsigned long start_pfn, unsigned long end_pfn);
ff9543fd MN	141	unsigned long
ff9543fd MN	142	isolate_migratepages_range(struct zone zone, struct compact_control cc,
e46a2879	143	unsigned long low_pfn, unsigned long end_pfn, bool unevictable);
ff9543fd MN	144
ff9543fd MN	145	#endif
0f8053a5	146
48f13bf3 MG	147	/*
	148	* function for dealing with page's order in buddy system.
	149	* zone->lock is already acquired when we use these.
	150	* So, we don't need atomic page->flags operations here.
	151	*/
	152	static inline unsigned long page_order(struct page *page)
	153	{
572438f9	154	/* PageBuddy() must be checked by the caller */
48f13bf3 MG	155	return page_private(page);
48f13bf3 MG	156	}
b5a0e011	157
6038def0 NK	158	/* mm/util.c */
	159	void __vma_link_list(struct mm_struct mm, struct vm_area_struct vma,
	160	struct vm_area_struct prev, struct rb_node rb_parent);
	161
af8e3354	162	#ifdef CONFIG_MMU
cea10a19 ML	163	extern long __mlock_vma_pages_range(struct vm_area_struct *vma,
cea10a19 ML	164	unsigned long start, unsigned long end, int *nonblocking);
af8e3354 HD	165	extern void munlock_vma_pages_range(struct vm_area_struct *vma,
	166	unsigned long start, unsigned long end);
	167	static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
	168	{
	169	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
	170	}
	171
b291f000	172	/*
39b5f29a HD	173	* Called only in fault path, to determine if a new page is being
39b5f29a HD	174	* mapped into a LOCKED vma. If it is, mark page as mlocked.
b291f000	175	*/
096a7cf4 YH	176	static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
096a7cf4 YH	177	struct page *page)
b291f000 NP	178	{
	179	VM_BUG_ON(PageLRU(page));
	180
	181	if (likely((vma->vm_flags & (VM_LOCKED \| VM_SPECIAL)) != VM_LOCKED))
	182	return 0;
	183
5344b7e6	184	if (!TestSetPageMlocked(page)) {
8449d21f DR	185	mod_zone_page_state(page_zone(page), NR_MLOCK,
8449d21f DR	186	hpage_nr_pages(page));
5344b7e6 NP	187	count_vm_event(UNEVICTABLE_PGMLOCKED);
5344b7e6 NP	188	}
b291f000 NP	189	return 1;
	190	}
	191
	192	/*
73848b46	193	* must be called with vma's mmap_sem held for read or write, and page locked.
b291f000 NP	194	*/
b291f000 NP	195	extern void mlock_vma_page(struct page *page);
ff6a6da6	196	extern unsigned int munlock_vma_page(struct page *page);
b291f000 NP	197
	198	/*
	199	* Clear the page's PageMlocked(). This can be useful in a situation where
	200	* we want to unconditionally remove a page from the pagecache -- e.g.,
	201	* on truncation or freeing.
	202	*
	203	* It is legal to call this function for any page, mlocked or not.
	204	* If called for a page that is still mapped by mlocked vmas, all we do
	205	* is revert to lazy LRU behaviour -- semantics are not broken.
	206	*/
e6c509f8	207	extern void clear_page_mlock(struct page *page);
b291f000 NP	208
	209	/*
	210	* mlock_migrate_page - called only from migrate_page_copy() to
5344b7e6	211	* migrate the Mlocked page flag; update statistics.
b291f000 NP	212	*/
	213	static inline void mlock_migrate_page(struct page newpage, struct page page)
	214	{
5344b7e6 NP	215	if (TestClearPageMlocked(page)) {
5344b7e6 NP	216	unsigned long flags;
b32967ff	217	int nr_pages = hpage_nr_pages(page);
5344b7e6 NP	218
5344b7e6 NP	219	local_irq_save(flags);
b32967ff	220	__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
b291f000	221	SetPageMlocked(newpage);
b32967ff	222	__mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
5344b7e6 NP	223	local_irq_restore(flags);
5344b7e6 NP	224	}
b291f000 NP	225	}
b291f000 NP	226
b32967ff MG	227	extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
b32967ff MG	228
71e3aac0 AA	229	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	230	extern unsigned long vma_address(struct page *page,
	231	struct vm_area_struct *vma);
	232	#endif
af8e3354	233	#else /* !CONFIG_MMU */
096a7cf4	234	static inline int mlocked_vma_newpage(struct vm_area_struct v, struct page p)
b291f000 NP	235	{
	236	return 0;
	237	}
	238	static inline void clear_page_mlock(struct page *page) { }
	239	static inline void mlock_vma_page(struct page *page) { }
	240	static inline void mlock_migrate_page(struct page new, struct page old) { }
	241
af8e3354	242	#endif /* !CONFIG_MMU */
894bc310	243
69d177c2 AW	244	/*
	245	* Return the mem_map entry representing the 'offset' subpage within
	246	* the maximally aligned gigantic page 'base'. Handle any discontiguity
	247	* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
	248	*/
	249	static inline struct page mem_map_offset(struct page base, int offset)
	250	{
	251	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
	252	return pfn_to_page(page_to_pfn(base) + offset);
	253	return base + offset;
	254	}
	255
	256	/*
25985edc	257	* Iterator over all subpages within the maximally aligned gigantic
69d177c2 AW	258	* page 'base'. Handle any discontiguity in the mem_map.
	259	*/
	260	static inline struct page mem_map_next(struct page iter,
	261	struct page *base, int offset)
	262	{
	263	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
	264	unsigned long pfn = page_to_pfn(base) + offset;
	265	if (!pfn_valid(pfn))
	266	return NULL;
	267	return pfn_to_page(pfn);
	268	}
	269	return iter + 1;
	270	}
	271
b5a0e011 AH	272	/*
	273	* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
	274	* so all functions starting at paging_init should be marked __init
	275	* in those cases. SPARSEMEM, however, allows for memory hotplug,
	276	* and alloc_bootmem_node is not used.
	277	*/
	278	#ifdef CONFIG_SPARSEMEM
	279	#define __paginginit __meminit
	280	#else
	281	#define __paginginit __init
	282	#endif
	283
6b74ab97 MG	284	/* Memory initialisation debug and verification */
	285	enum mminit_level {
	286	MMINIT_WARNING,
	287	MMINIT_VERIFY,
	288	MMINIT_TRACE
	289	};
	290
	291	#ifdef CONFIG_DEBUG_MEMORY_INIT
	292
	293	extern int mminit_loglevel;
	294
	295	#define mminit_dprintk(level, prefix, fmt, arg...) \
	296	do { \
	297	if (level < mminit_loglevel) { \
	298	printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
	299	printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
	300	} \
	301	} while (0)
	302
708614e6 MG	303	extern void mminit_verify_pageflags_layout(void);
	304	extern void mminit_verify_page_links(struct page *page,
	305	enum zone_type zone, unsigned long nid, unsigned long pfn);
68ad8df4	306	extern void mminit_verify_zonelist(void);
708614e6	307
6b74ab97 MG	308	#else
	309
	310	static inline void mminit_dprintk(enum mminit_level level,
	311	const char prefix, const char fmt, ...)
	312	{
	313	}
	314
708614e6 MG	315	static inline void mminit_verify_pageflags_layout(void)
	316	{
	317	}
	318
	319	static inline void mminit_verify_page_links(struct page *page,
	320	enum zone_type zone, unsigned long nid, unsigned long pfn)
	321	{
	322	}
68ad8df4 MG	323
	324	static inline void mminit_verify_zonelist(void)
	325	{
	326	}
6b74ab97	327	#endif /* CONFIG_DEBUG_MEMORY_INIT */
2dbb51c4 MG	328
	329	/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
	330	#if defined(CONFIG_SPARSEMEM)
	331	extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	332	unsigned long *end_pfn);
	333	#else
	334	static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	335	unsigned long *end_pfn)
	336	{
	337	}
	338	#endif /* CONFIG_SPARSEMEM */
	339
fa5e084e MG	340	#define ZONE_RECLAIM_NOSCAN -2
	341	#define ZONE_RECLAIM_FULL -1
	342	#define ZONE_RECLAIM_SOME 0
	343	#define ZONE_RECLAIM_SUCCESS 1
7c116f2b	344
31d3d348 WF	345	extern int hwpoison_filter(struct page *p);
31d3d348 WF	346
7c116f2b WF	347	extern u32 hwpoison_filter_dev_major;
7c116f2b WF	348	extern u32 hwpoison_filter_dev_minor;
478c5ffc WF	349	extern u64 hwpoison_filter_flags_mask;
478c5ffc WF	350	extern u64 hwpoison_filter_flags_value;
4fd466eb	351	extern u64 hwpoison_filter_memcg;
1bfe5feb	352	extern u32 hwpoison_filter_enable;
eb36c587 AV	353
	354	extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
	355	unsigned long, unsigned long,
	356	unsigned long, unsigned long);
ca57df79 XQ	357
ca57df79 XQ	358	extern void set_pageblock_order(void);
02c6de8d MK	359	unsigned long reclaim_clean_pages_from_list(struct zone *zone,
02c6de8d MK	360	struct list_head *page_list);
d95ea5d1 BZ	361	/* The ALLOC_WMARK bits are used as an index to zone->watermark */
	362	#define ALLOC_WMARK_MIN WMARK_MIN
	363	#define ALLOC_WMARK_LOW WMARK_LOW
	364	#define ALLOC_WMARK_HIGH WMARK_HIGH
	365	#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
	366
	367	/* Mask to get the watermark bits */
	368	#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
	369
	370	#define ALLOC_HARDER 0x10 /* try to alloc harder */
	371	#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
	372	#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
	373	#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
	374
db971418	375	#endif /* __MM_INTERNAL_H */