[mirror_ubuntu-artful-kernel.git] / include / linux / gfp.h

#ifndef __LINUX_GFP_H
#define __LINUX_GFP_H

#include <linux/mmzone.h>
#include <linux/stddef.h>
#include <linux/linkage.h>
#include <linux/topology.h>

struct vm_area_struct;

/*
 * GFP bitmasks..
 *
 * Zone modifiers (see linux/mmzone.h - low three bits)
 *
 * Do not put any conditional on these. If necessary modify the definitions
 * without the underscores and use the consistently. The definitions here may
 * be used in bit comparisons.
 */
#define __GFP_DMA	((__force gfp_t)0x01u)
#define __GFP_HIGHMEM	((__force gfp_t)0x02u)
#define __GFP_DMA32	((__force gfp_t)0x04u)

/*
 * Action modifiers - doesn't change the zoning
 *
 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
 * _might_ fail.  This depends upon the particular VM implementation.
 *
 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
 * cannot handle allocation failures.
 *
 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
 *
 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
 * mechanism or reclaimed
 */
#define __GFP_WAIT	((__force gfp_t)0x10u)	/* Can wait and reschedule? */
#define __GFP_HIGH	((__force gfp_t)0x20u)	/* Should access emergency pools? */
#define __GFP_IO	((__force gfp_t)0x40u)	/* Can start physical IO? */
#define __GFP_FS	((__force gfp_t)0x80u)	/* Can call down to low-level FS? */
#define __GFP_COLD	((__force gfp_t)0x100u)	/* Cache-cold page required */
#define __GFP_NOWARN	((__force gfp_t)0x200u)	/* Suppress page allocation failure warning */
#define __GFP_REPEAT	((__force gfp_t)0x400u)	/* See above */
#define __GFP_NOFAIL	((__force gfp_t)0x800u)	/* See above */
#define __GFP_NORETRY	((__force gfp_t)0x1000u)/* See above */
#define __GFP_COMP	((__force gfp_t)0x4000u)/* Add compound page metadata */
#define __GFP_ZERO	((__force gfp_t)0x8000u)/* Return zeroed page on success */
#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
#define __GFP_HARDWALL   ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
#define __GFP_THISNODE	((__force gfp_t)0x40000u)/* No fallback, no policies */
#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
#define __GFP_MOVABLE	((__force gfp_t)0x100000u)  /* Page is movable */
#define __GFP_NOTRACK	((__force gfp_t)0x200000u)  /* Don't track with kmemcheck */

/*
 * This may seem redundant, but it's a way of annotating false positives vs.
 * allocations that simply cannot be supported (e.g. page tables).
 */
#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)

#define __GFP_BITS_SHIFT 22	/* Room for 22 __GFP_FOO bits */
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))

/* This equals 0, but use constants in case they ever change */
#define GFP_NOWAIT	(GFP_ATOMIC & ~__GFP_HIGH)
/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
#define GFP_ATOMIC	(__GFP_HIGH)
#define GFP_NOIO	(__GFP_WAIT)
#define GFP_NOFS	(__GFP_WAIT | __GFP_IO)
#define GFP_KERNEL	(__GFP_WAIT | __GFP_IO | __GFP_FS)
#define GFP_TEMPORARY	(__GFP_WAIT | __GFP_IO | __GFP_FS | \
			 __GFP_RECLAIMABLE)
#define GFP_USER	(__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
#define GFP_HIGHUSER	(__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
			 __GFP_HIGHMEM)
#define GFP_HIGHUSER_MOVABLE	(__GFP_WAIT | __GFP_IO | __GFP_FS | \
				 __GFP_HARDWALL | __GFP_HIGHMEM | \
				 __GFP_MOVABLE)

#ifdef CONFIG_NUMA
#define GFP_THISNODE	(__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
#else
#define GFP_THISNODE	((__force gfp_t)0)
#endif

/* This mask makes up all the page movable related flags */
#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)

/* Control page allocator reclaim behavior */
#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
			__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
			__GFP_NORETRY|__GFP_NOMEMALLOC)

/* Control allocation constraints */
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)

/* Do not use these with a slab allocator */
#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)

/* Flag - indicates that the buffer will be suitable for DMA.  Ignored on some
   platforms, used as appropriate on others */

#define GFP_DMA		__GFP_DMA

/* 4GB DMA on some platforms */
#define GFP_DMA32	__GFP_DMA32

/* Convert GFP flags to their corresponding migrate type */
static inline int allocflags_to_migratetype(gfp_t gfp_flags)
{
	WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);

	if (unlikely(page_group_by_mobility_disabled))
		return MIGRATE_UNMOVABLE;

	/* Group based on mobility */
	return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
		((gfp_flags & __GFP_RECLAIMABLE) != 0);
}

static inline enum zone_type gfp_zone(gfp_t flags)
{
#ifdef CONFIG_ZONE_DMA
	if (flags & __GFP_DMA)
		return ZONE_DMA;
#endif
#ifdef CONFIG_ZONE_DMA32
	if (flags & __GFP_DMA32)
		return ZONE_DMA32;
#endif
	if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
			(__GFP_HIGHMEM | __GFP_MOVABLE))
		return ZONE_MOVABLE;
#ifdef CONFIG_HIGHMEM
	if (flags & __GFP_HIGHMEM)
		return ZONE_HIGHMEM;
#endif
	return ZONE_NORMAL;
}

/*
 * There is only one page-allocator function, and two main namespaces to
 * it. The alloc_page*() variants return 'struct page *' and as such
 * can allocate highmem pages, the *get*page*() variants return
 * virtual kernel addresses to the allocated page(s).
 */

static inline int gfp_zonelist(gfp_t flags)
{
	if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
		return 1;

	return 0;
}

/*
 * We get the zone list from the current node and the gfp_mask.
 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
 * There are two zonelists per node, one for all zones with memory and
 * one containing just zones from the node the zonelist belongs to.
 *
 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
 * optimized to &contig_page_data at compile-time.
 */
static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
{
	return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
}

#ifndef HAVE_ARCH_FREE_PAGE
static inline void arch_free_page(struct page *page, int order) { }
#endif
#ifndef HAVE_ARCH_ALLOC_PAGE
static inline void arch_alloc_page(struct page *page, int order) { }
#endif

struct page *
__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
		       struct zonelist *zonelist, nodemask_t *nodemask);

static inline struct page *
__alloc_pages(gfp_t gfp_mask, unsigned int order,
		struct zonelist *zonelist)
{
	return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
}

static inline struct page *
__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
		struct zonelist *zonelist, nodemask_t *nodemask)
{
	return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
}


static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
						unsigned int order)
{
	if (unlikely(order >= MAX_ORDER))
		return NULL;

	/* Unknown node is current node */
	if (nid < 0)
		nid = numa_node_id();

	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
}

#ifdef CONFIG_NUMA
extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);

static inline struct page *
alloc_pages(gfp_t gfp_mask, unsigned int order)
{
	if (unlikely(order >= MAX_ORDER))
		return NULL;

	return alloc_pages_current(gfp_mask, order);
}
extern struct page *alloc_page_vma(gfp_t gfp_mask,
			struct vm_area_struct *vma, unsigned long addr);
#else
#define alloc_pages(gfp_mask, order) \
		alloc_pages_node(numa_node_id(), gfp_mask, order)
#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
#endif
#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)

extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
extern unsigned long get_zeroed_page(gfp_t gfp_mask);

void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
void free_pages_exact(void *virt, size_t size);

#define __get_free_page(gfp_mask) \
		__get_free_pages((gfp_mask),0)

#define __get_dma_pages(gfp_mask, order) \
		__get_free_pages((gfp_mask) | GFP_DMA,(order))

extern void __free_pages(struct page *page, unsigned int order);
extern void free_pages(unsigned long addr, unsigned int order);
extern void free_hot_page(struct page *page);
extern void free_cold_page(struct page *page);

#define __free_page(page) __free_pages((page), 0)
#define free_page(addr) free_pages((addr),0)

void page_alloc_init(void);
void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
void drain_all_pages(void);
void drain_local_pages(void *dummy);

#endif /* __LINUX_GFP_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_GFP_H
	2	#define __LINUX_GFP_H
	3
	4	#include <linux/mmzone.h>
	5	#include <linux/stddef.h>
	6	#include <linux/linkage.h>
082edb7b	7	#include <linux/topology.h>
1da177e4 LT	8
	9	struct vm_area_struct;
	10
	11	/*
	12	* GFP bitmasks..
e53ef38d CL	13	*
	14	* Zone modifiers (see linux/mmzone.h - low three bits)
	15	*
e53ef38d CL	16	* Do not put any conditional on these. If necessary modify the definitions
	17	* without the underscores and use the consistently. The definitions here may
	18	* be used in bit comparisons.
1da177e4	19	*/
af4ca457 AV	20	#define __GFP_DMA ((__force gfp_t)0x01u)
af4ca457 AV	21	#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
e53ef38d	22	#define __GFP_DMA32 ((__force gfp_t)0x04u)
1da177e4 LT	23
	24	/*
	25	* Action modifiers - doesn't change the zoning
	26	*
	27	* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
	28	* _might_ fail. This depends upon the particular VM implementation.
	29	*
	30	* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
	31	* cannot handle allocation failures.
	32	*
	33	* __GFP_NORETRY: The VM implementation must not retry indefinitely.
769848c0 MG	34	*
	35	* __GFP_MOVABLE: Flag that this page will be movable by the page migration
	36	* mechanism or reclaimed
1da177e4	37	*/
af4ca457 AV	38	#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
	39	#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
	40	#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
	41	#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
	42	#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
	43	#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
ab857d09 NA	44	#define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
	45	#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
	46	#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
af4ca457 AV	47	#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
	48	#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
	49	#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
2d6c666e	50	#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
9b819d20	51	#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
e12ba74d MG	52	#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
e12ba74d MG	53	#define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
2dff4405	54	#define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
1da177e4	55
2dff4405 VN	56	/*
	57	* This may seem redundant, but it's a way of annotating false positives vs.
	58	* allocations that simply cannot be supported (e.g. page tables).
	59	*/
	60	#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
	61
	62	#define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */
af4ca457	63	#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
1da177e4	64
7b04d717 JD	65	/* This equals 0, but use constants in case they ever change */
7b04d717 JD	66	#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
4eac915d	67	/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
1da177e4 LT	68	#define GFP_ATOMIC (__GFP_HIGH)
	69	#define GFP_NOIO (__GFP_WAIT)
	70	#define GFP_NOFS (__GFP_WAIT \| __GFP_IO)
	71	#define GFP_KERNEL (__GFP_WAIT \| __GFP_IO \| __GFP_FS)
e12ba74d MG	72	#define GFP_TEMPORARY (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| \
e12ba74d MG	73	__GFP_RECLAIMABLE)
f90b1d2f PJ	74	#define GFP_USER (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| __GFP_HARDWALL)
	75	#define GFP_HIGHUSER (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| __GFP_HARDWALL \| \
	76	__GFP_HIGHMEM)
769848c0 MG	77	#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| \
	78	__GFP_HARDWALL \| __GFP_HIGHMEM \| \
	79	__GFP_MOVABLE)
1da177e4	80
77f700da	81	#ifdef CONFIG_NUMA
980128f2	82	#define GFP_THISNODE (__GFP_THISNODE \| __GFP_NOWARN \| __GFP_NORETRY)
77f700da	83	#else
f2e97df6	84	#define GFP_THISNODE ((__force gfp_t)0)
77f700da CL	85	#endif
77f700da CL	86
6cb06229	87	/* This mask makes up all the page movable related flags */
e12ba74d	88	#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE\|__GFP_MOVABLE)
6cb06229 CL	89
	90	/* Control page allocator reclaim behavior */
	91	#define GFP_RECLAIM_MASK (__GFP_WAIT\|__GFP_HIGH\|__GFP_IO\|__GFP_FS\|\
	92	__GFP_NOWARN\|__GFP_REPEAT\|__GFP_NOFAIL\|\
	93	__GFP_NORETRY\|__GFP_NOMEMALLOC)
	94
	95	/* Control allocation constraints */
	96	#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL\|__GFP_THISNODE)
	97
	98	/* Do not use these with a slab allocator */
	99	#define GFP_SLAB_BUG_MASK (__GFP_DMA32\|__GFP_HIGHMEM\|~__GFP_BITS_MASK)
980128f2	100
1da177e4 LT	101	/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
	102	platforms, used as appropriate on others */
	103
	104	#define GFP_DMA __GFP_DMA
	105
a2f1b424 AK	106	/* 4GB DMA on some platforms */
	107	#define GFP_DMA32 __GFP_DMA32
	108
467c996c MG	109	/* Convert GFP flags to their corresponding migrate type */
	110	static inline int allocflags_to_migratetype(gfp_t gfp_flags)
	111	{
	112	WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
	113
	114	if (unlikely(page_group_by_mobility_disabled))
	115	return MIGRATE_UNMOVABLE;
	116
	117	/* Group based on mobility */
	118	return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) \|
	119	((gfp_flags & __GFP_RECLAIMABLE) != 0);
	120	}
a2f1b424	121
19655d34	122	static inline enum zone_type gfp_zone(gfp_t flags)
4e4785bc	123	{
4b51d669	124	#ifdef CONFIG_ZONE_DMA
4e4785bc	125	if (flags & __GFP_DMA)
8cece85e	126	return ZONE_DMA;
4b51d669	127	#endif
4e4785bc CL	128	#ifdef CONFIG_ZONE_DMA32
4e4785bc CL	129	if (flags & __GFP_DMA32)
8cece85e	130	return ZONE_DMA32;
4e4785bc	131	#endif
2a1e274a MG	132	if ((flags & (__GFP_HIGHMEM \| __GFP_MOVABLE)) ==
2a1e274a MG	133	(__GFP_HIGHMEM \| __GFP_MOVABLE))
8cece85e	134	return ZONE_MOVABLE;
4e4785bc CL	135	#ifdef CONFIG_HIGHMEM
4e4785bc CL	136	if (flags & __GFP_HIGHMEM)
8cece85e	137	return ZONE_HIGHMEM;
4e4785bc	138	#endif
8cece85e	139	return ZONE_NORMAL;
4e4785bc CL	140	}
4e4785bc CL	141
1da177e4 LT	142	/*
	143	* There is only one page-allocator function, and two main namespaces to
	144	* it. The alloc_page() variants return 'struct page ' and as such
	145	* can allocate highmem pages, the getpage*() variants return
	146	* virtual kernel addresses to the allocated page(s).
	147	*/
	148
54a6eb5c MG	149	static inline int gfp_zonelist(gfp_t flags)
	150	{
	151	if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
	152	return 1;
	153
	154	return 0;
	155	}
	156
1da177e4 LT	157	/*
	158	* We get the zone list from the current node and the gfp_mask.
	159	* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
54a6eb5c MG	160	* There are two zonelists per node, one for all zones with memory and
54a6eb5c MG	161	* one containing just zones from the node the zonelist belongs to.
1da177e4 LT	162	*
	163	* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
	164	* optimized to &contig_page_data at compile-time.
	165	*/
0e88460d MG	166	static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
0e88460d MG	167	{
54a6eb5c	168	return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
0e88460d	169	}
1da177e4 LT	170
	171	#ifndef HAVE_ARCH_FREE_PAGE
	172	static inline void arch_free_page(struct page *page, int order) { }
	173	#endif
cc102509 NP	174	#ifndef HAVE_ARCH_ALLOC_PAGE
	175	static inline void arch_alloc_page(struct page *page, int order) { }
	176	#endif
1da177e4	177
e4048e5d KM	178	struct page *
	179	__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
	180	struct zonelist zonelist, nodemask_t nodemask);
	181
	182	static inline struct page *
	183	__alloc_pages(gfp_t gfp_mask, unsigned int order,
	184	struct zonelist *zonelist)
	185	{
	186	return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
	187	}
	188
	189	static inline struct page *
	190	__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
	191	struct zonelist zonelist, nodemask_t nodemask)
	192	{
	193	return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
	194	}
1da177e4	195
19770b32	196
dd0fc66f	197	static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
1da177e4 LT	198	unsigned int order)
	199	{
	200	if (unlikely(order >= MAX_ORDER))
	201	return NULL;
	202
819a6928 AK	203	/* Unknown node is current node */
	204	if (nid < 0)
	205	nid = numa_node_id();
	206
0e88460d	207	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
1da177e4 LT	208	}
	209
	210	#ifdef CONFIG_NUMA
dd0fc66f	211	extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
1da177e4 LT	212
1da177e4 LT	213	static inline struct page *
dd0fc66f	214	alloc_pages(gfp_t gfp_mask, unsigned int order)
1da177e4 LT	215	{
	216	if (unlikely(order >= MAX_ORDER))
	217	return NULL;
	218
	219	return alloc_pages_current(gfp_mask, order);
	220	}
dd0fc66f	221	extern struct page *alloc_page_vma(gfp_t gfp_mask,
1da177e4 LT	222	struct vm_area_struct *vma, unsigned long addr);
	223	#else
	224	#define alloc_pages(gfp_mask, order) \
	225	alloc_pages_node(numa_node_id(), gfp_mask, order)
	226	#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
	227	#endif
	228	#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
	229
b3c97528 HH	230	extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
b3c97528 HH	231	extern unsigned long get_zeroed_page(gfp_t gfp_mask);
1da177e4	232
2be0ffe2 TT	233	void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
	234	void free_pages_exact(void *virt, size_t size);
	235
1da177e4 LT	236	#define __get_free_page(gfp_mask) \
	237	__get_free_pages((gfp_mask),0)
	238
	239	#define __get_dma_pages(gfp_mask, order) \
	240	__get_free_pages((gfp_mask) \| GFP_DMA,(order))
	241
b3c97528 HH	242	extern void __free_pages(struct page *page, unsigned int order);
	243	extern void free_pages(unsigned long addr, unsigned int order);
	244	extern void free_hot_page(struct page *page);
	245	extern void free_cold_page(struct page *page);
1da177e4 LT	246
	247	#define __free_page(page) __free_pages((page), 0)
	248	#define free_page(addr) free_pages((addr),0)
	249
	250	void page_alloc_init(void);
4037d452	251	void drain_zone_pages(struct zone zone, struct per_cpu_pages pcp);
9f8f2172 CL	252	void drain_all_pages(void);
9f8f2172 CL	253	void drain_local_pages(void *dummy);
1da177e4 LT	254
1da177e4 LT	255	#endif /* __LINUX_GFP_H */