[net-next-2.6.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 __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);


/*
 * 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)
{
	VM_BUG_ON(!PageBuddy(page));
	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);

#define ZONE_RECLAIM_NOSCAN	-2
#define ZONE_RECLAIM_FULL	-1
#define ZONE_RECLAIM_SOME	0
#define ZONE_RECLAIM_SUCCESS	1
#endif
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
0f8053a5 NP	35	static inline void __put_page(struct page *page)
	36	{
	37	atomic_dec(&page->_count);
	38	}
	39
03f6462a HD	40	extern unsigned long highest_memmap_pfn;
03f6462a HD	41
894bc310 LS	42	/*
	43	* in mm/vmscan.c:
	44	*/
62695a84	45	extern int isolate_lru_page(struct page *page);
894bc310	46	extern void putback_lru_page(struct page *page);
62695a84	47
894bc310 LS	48	/*
	49	* in mm/page_alloc.c
	50	*/
0c0a4a51	51	extern void __free_pages_bootmem(struct page *page, unsigned int order);
20a0307c WF	52	extern void prep_compound_page(struct page *page, unsigned long order);
20a0307c WF	53
0f8053a5	54
48f13bf3 MG	55	/*
	56	* function for dealing with page's order in buddy system.
	57	* zone->lock is already acquired when we use these.
	58	* So, we don't need atomic page->flags operations here.
	59	*/
	60	static inline unsigned long page_order(struct page *page)
	61	{
	62	VM_BUG_ON(!PageBuddy(page));
	63	return page_private(page);
	64	}
b5a0e011	65
af8e3354 HD	66	#ifdef CONFIG_MMU
	67	extern long mlock_vma_pages_range(struct vm_area_struct *vma,
	68	unsigned long start, unsigned long end);
	69	extern void munlock_vma_pages_range(struct vm_area_struct *vma,
	70	unsigned long start, unsigned long end);
	71	static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
	72	{
	73	munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
	74	}
	75
b291f000 NP	76	/*
	77	* Called only in fault path via page_evictable() for a new page
	78	* to determine if it's being mapped into a LOCKED vma.
	79	* If so, mark page as mlocked.
	80	*/
	81	static inline int is_mlocked_vma(struct vm_area_struct vma, struct page page)
	82	{
	83	VM_BUG_ON(PageLRU(page));
	84
	85	if (likely((vma->vm_flags & (VM_LOCKED \| VM_SPECIAL)) != VM_LOCKED))
	86	return 0;
	87
5344b7e6 NP	88	if (!TestSetPageMlocked(page)) {
	89	inc_zone_page_state(page, NR_MLOCK);
	90	count_vm_event(UNEVICTABLE_PGMLOCKED);
	91	}
b291f000 NP	92	return 1;
	93	}
	94
	95	/*
73848b46	96	* must be called with vma's mmap_sem held for read or write, and page locked.
b291f000 NP	97	*/
b291f000 NP	98	extern void mlock_vma_page(struct page *page);
73848b46	99	extern void munlock_vma_page(struct page *page);
b291f000 NP	100
	101	/*
	102	* Clear the page's PageMlocked(). This can be useful in a situation where
	103	* we want to unconditionally remove a page from the pagecache -- e.g.,
	104	* on truncation or freeing.
	105	*
	106	* It is legal to call this function for any page, mlocked or not.
	107	* If called for a page that is still mapped by mlocked vmas, all we do
	108	* is revert to lazy LRU behaviour -- semantics are not broken.
	109	*/
	110	extern void __clear_page_mlock(struct page *page);
	111	static inline void clear_page_mlock(struct page *page)
	112	{
	113	if (unlikely(TestClearPageMlocked(page)))
	114	__clear_page_mlock(page);
	115	}
	116
	117	/*
	118	* mlock_migrate_page - called only from migrate_page_copy() to
5344b7e6	119	* migrate the Mlocked page flag; update statistics.
b291f000 NP	120	*/
	121	static inline void mlock_migrate_page(struct page newpage, struct page page)
	122	{
5344b7e6 NP	123	if (TestClearPageMlocked(page)) {
	124	unsigned long flags;
	125
	126	local_irq_save(flags);
	127	__dec_zone_page_state(page, NR_MLOCK);
b291f000	128	SetPageMlocked(newpage);
5344b7e6 NP	129	__inc_zone_page_state(newpage, NR_MLOCK);
	130	local_irq_restore(flags);
	131	}
b291f000 NP	132	}
b291f000 NP	133
af8e3354	134	#else /* !CONFIG_MMU */
b291f000 NP	135	static inline int is_mlocked_vma(struct vm_area_struct v, struct page p)
	136	{
	137	return 0;
	138	}
	139	static inline void clear_page_mlock(struct page *page) { }
	140	static inline void mlock_vma_page(struct page *page) { }
	141	static inline void mlock_migrate_page(struct page new, struct page old) { }
	142
af8e3354	143	#endif /* !CONFIG_MMU */
894bc310	144
69d177c2 AW	145	/*
	146	* Return the mem_map entry representing the 'offset' subpage within
	147	* the maximally aligned gigantic page 'base'. Handle any discontiguity
	148	* in the mem_map at MAX_ORDER_NR_PAGES boundaries.
	149	*/
	150	static inline struct page mem_map_offset(struct page base, int offset)
	151	{
	152	if (unlikely(offset >= MAX_ORDER_NR_PAGES))
	153	return pfn_to_page(page_to_pfn(base) + offset);
	154	return base + offset;
	155	}
	156
	157	/*
	158	* Iterator over all subpages withing the maximally aligned gigantic
	159	* page 'base'. Handle any discontiguity in the mem_map.
	160	*/
	161	static inline struct page mem_map_next(struct page iter,
	162	struct page *base, int offset)
	163	{
	164	if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
	165	unsigned long pfn = page_to_pfn(base) + offset;
	166	if (!pfn_valid(pfn))
	167	return NULL;
	168	return pfn_to_page(pfn);
	169	}
	170	return iter + 1;
	171	}
	172
b5a0e011 AH	173	/*
	174	* FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
	175	* so all functions starting at paging_init should be marked __init
	176	* in those cases. SPARSEMEM, however, allows for memory hotplug,
	177	* and alloc_bootmem_node is not used.
	178	*/
	179	#ifdef CONFIG_SPARSEMEM
	180	#define __paginginit __meminit
	181	#else
	182	#define __paginginit __init
	183	#endif
	184
6b74ab97 MG	185	/* Memory initialisation debug and verification */
	186	enum mminit_level {
	187	MMINIT_WARNING,
	188	MMINIT_VERIFY,
	189	MMINIT_TRACE
	190	};
	191
	192	#ifdef CONFIG_DEBUG_MEMORY_INIT
	193
	194	extern int mminit_loglevel;
	195
	196	#define mminit_dprintk(level, prefix, fmt, arg...) \
	197	do { \
	198	if (level < mminit_loglevel) { \
	199	printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
	200	printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
	201	} \
	202	} while (0)
	203
708614e6 MG	204	extern void mminit_verify_pageflags_layout(void);
	205	extern void mminit_verify_page_links(struct page *page,
	206	enum zone_type zone, unsigned long nid, unsigned long pfn);
68ad8df4	207	extern void mminit_verify_zonelist(void);
708614e6	208
6b74ab97 MG	209	#else
	210
	211	static inline void mminit_dprintk(enum mminit_level level,
	212	const char prefix, const char fmt, ...)
	213	{
	214	}
	215
708614e6 MG	216	static inline void mminit_verify_pageflags_layout(void)
	217	{
	218	}
	219
	220	static inline void mminit_verify_page_links(struct page *page,
	221	enum zone_type zone, unsigned long nid, unsigned long pfn)
	222	{
	223	}
68ad8df4 MG	224
	225	static inline void mminit_verify_zonelist(void)
	226	{
	227	}
6b74ab97	228	#endif /* CONFIG_DEBUG_MEMORY_INIT */
2dbb51c4 MG	229
	230	/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
	231	#if defined(CONFIG_SPARSEMEM)
	232	extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	233	unsigned long *end_pfn);
	234	#else
	235	static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
	236	unsigned long *end_pfn)
	237	{
	238	}
	239	#endif /* CONFIG_SPARSEMEM */
	240
b291f000	241	int __get_user_pages(struct task_struct tsk, struct mm_struct mm,
58fa879e	242	unsigned long start, int len, unsigned int foll_flags,
b291f000 NP	243	struct page pages, struct vm_area_struct vmas);
b291f000 NP	244
fa5e084e MG	245	#define ZONE_RECLAIM_NOSCAN -2
	246	#define ZONE_RECLAIM_FULL -1
	247	#define ZONE_RECLAIM_SOME 0
	248	#define ZONE_RECLAIM_SUCCESS 1
0f8053a5	249	#endif