[deliverable/linux.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>
#include <linux/mmdebug.h>

struct vm_area_struct;

/* Plain integer GFP bitmasks. Do not use this directly. */
#define ___GFP_DMA		0x01u
#define ___GFP_HIGHMEM		0x02u
#define ___GFP_DMA32		0x04u
#define ___GFP_MOVABLE		0x08u
#define ___GFP_WAIT		0x10u
#define ___GFP_HIGH		0x20u
#define ___GFP_IO		0x40u
#define ___GFP_FS		0x80u
#define ___GFP_COLD		0x100u
#define ___GFP_NOWARN		0x200u
#define ___GFP_REPEAT		0x400u
#define ___GFP_NOFAIL		0x800u
#define ___GFP_NORETRY		0x1000u
#define ___GFP_MEMALLOC		0x2000u
#define ___GFP_COMP		0x4000u
#define ___GFP_ZERO		0x8000u
#define ___GFP_NOMEMALLOC	0x10000u
#define ___GFP_HARDWALL		0x20000u
#define ___GFP_THISNODE		0x40000u
#define ___GFP_RECLAIMABLE	0x80000u
#define ___GFP_NOTRACK		0x200000u
#define ___GFP_OTHER_NODE	0x800000u
#define ___GFP_WRITE		0x1000000u

/*
 * 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 them consistently. The definitions here may
 * be used in bit comparisons.
 */
#define __GFP_DMA	((__force gfp_t)___GFP_DMA)
#define __GFP_HIGHMEM	((__force gfp_t)___GFP_HIGHMEM)
#define __GFP_DMA32	((__force gfp_t)___GFP_DMA32)
#define __GFP_MOVABLE	((__force gfp_t)___GFP_MOVABLE)  /* Page is movable */
#define GFP_ZONEMASK	(__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
/*
 * 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.  This modifier is deprecated and no new
 * users should be added.
 *
 * __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)___GFP_WAIT)	/* Can wait and reschedule? */
#define __GFP_HIGH	((__force gfp_t)___GFP_HIGH)	/* Should access emergency pools? */
#define __GFP_IO	((__force gfp_t)___GFP_IO)	/* Can start physical IO? */
#define __GFP_FS	((__force gfp_t)___GFP_FS)	/* Can call down to low-level FS? */
#define __GFP_COLD	((__force gfp_t)___GFP_COLD)	/* Cache-cold page required */
#define __GFP_NOWARN	((__force gfp_t)___GFP_NOWARN)	/* Suppress page allocation failure warning */
#define __GFP_REPEAT	((__force gfp_t)___GFP_REPEAT)	/* See above */
#define __GFP_NOFAIL	((__force gfp_t)___GFP_NOFAIL)	/* See above */
#define __GFP_NORETRY	((__force gfp_t)___GFP_NORETRY) /* See above */
#define __GFP_MEMALLOC	((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
#define __GFP_COMP	((__force gfp_t)___GFP_COMP)	/* Add compound page metadata */
#define __GFP_ZERO	((__force gfp_t)___GFP_ZERO)	/* Return zeroed page on success */
#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves.
							 * This takes precedence over the
							 * __GFP_MEMALLOC flag if both are
							 * set
							 */
#define __GFP_HARDWALL   ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */
#define __GFP_THISNODE	((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */
#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
#define __GFP_NOTRACK	((__force gfp_t)___GFP_NOTRACK)  /* Don't track with kmemcheck */

#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
#define __GFP_WRITE	((__force gfp_t)___GFP_WRITE)	/* Allocator intends to dirty page */

/*
 * 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 25	/* Room for N __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)
#define GFP_IOFS	(__GFP_IO | __GFP_FS)
#define GFP_TRANSHUGE	(GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
			 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN)

#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_MEMALLOC|__GFP_NOMEMALLOC)

/* Control slab gfp mask during early boot */
#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS))

/* 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);
}

#ifdef CONFIG_HIGHMEM
#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
#else
#define OPT_ZONE_HIGHMEM ZONE_NORMAL
#endif

#ifdef CONFIG_ZONE_DMA
#define OPT_ZONE_DMA ZONE_DMA
#else
#define OPT_ZONE_DMA ZONE_NORMAL
#endif

#ifdef CONFIG_ZONE_DMA32
#define OPT_ZONE_DMA32 ZONE_DMA32
#else
#define OPT_ZONE_DMA32 ZONE_NORMAL
#endif

/*
 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
 * and there are 16 of them to cover all possible combinations of
 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
 *
 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
 * But GFP_MOVABLE is not only a zone specifier but also an allocation
 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
 *
 *       bit       result
 *       =================
 *       0x0    => NORMAL
 *       0x1    => DMA or NORMAL
 *       0x2    => HIGHMEM or NORMAL
 *       0x3    => BAD (DMA+HIGHMEM)
 *       0x4    => DMA32 or DMA or NORMAL
 *       0x5    => BAD (DMA+DMA32)
 *       0x6    => BAD (HIGHMEM+DMA32)
 *       0x7    => BAD (HIGHMEM+DMA32+DMA)
 *       0x8    => NORMAL (MOVABLE+0)
 *       0x9    => DMA or NORMAL (MOVABLE+DMA)
 *       0xa    => MOVABLE (Movable is valid only if HIGHMEM is set too)
 *       0xb    => BAD (MOVABLE+HIGHMEM+DMA)
 *       0xc    => DMA32 (MOVABLE+HIGHMEM+DMA32)
 *       0xd    => BAD (MOVABLE+DMA32+DMA)
 *       0xe    => BAD (MOVABLE+DMA32+HIGHMEM)
 *       0xf    => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
 *
 * ZONES_SHIFT must be <= 2 on 32 bit platforms.
 */

#if 16 * ZONES_SHIFT > BITS_PER_LONG
#error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
#endif

#define GFP_ZONE_TABLE ( \
	(ZONE_NORMAL << 0 * ZONES_SHIFT)				      \
	| (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT)			      \
	| (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT)		      \
	| (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT)		      \
	| (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT)			      \
	| (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT)	      \
	| (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT)   \
	| (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT)   \
)

/*
 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
 * entry starting with bit 0. Bit is set if the combination is not
 * allowed.
 */
#define GFP_ZONE_BAD ( \
	1 << (___GFP_DMA | ___GFP_HIGHMEM)				      \
	| 1 << (___GFP_DMA | ___GFP_DMA32)				      \
	| 1 << (___GFP_DMA32 | ___GFP_HIGHMEM)				      \
	| 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM)		      \
	| 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA)		      \
	| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA)		      \
	| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM)		      \
	| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM)  \
)

static inline enum zone_type gfp_zone(gfp_t flags)
{
	enum zone_type z;
	int bit = (__force int) (flags & GFP_ZONEMASK);

	z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
					 ((1 << ZONES_SHIFT) - 1);
	VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
	return z;
}

/*
 * 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_nodemask(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_nodemask(gfp_mask, order, zonelist, NULL);
}

static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
						unsigned int order)
{
	/* Unknown node is current node */
	if (nid < 0)
		nid = numa_node_id();

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

static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
						unsigned int order)
{
	VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid));

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

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);
/* This is different from alloc_pages_exact_node !!! */
void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);

#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_cold_page(struct page *page, int cold);
extern void free_hot_cold_page_list(struct list_head *list, int cold);

#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);

/*
 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
 * GFP flags are used before interrupts are enabled. Once interrupts are
 * enabled, it is set to __GFP_BITS_MASK while the system is running. During
 * hibernation, it is used by PM to avoid I/O during memory allocation while
 * devices are suspended.
 */
extern gfp_t gfp_allowed_mask;

/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);

extern void pm_restrict_gfp_mask(void);
extern void pm_restore_gfp_mask(void);

#ifdef CONFIG_PM_SLEEP
extern bool pm_suspended_storage(void);
#else
static inline bool pm_suspended_storage(void)
{
	return false;
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_CMA

/* The below functions must be run on a range from a single zone. */
extern int alloc_contig_range(unsigned long start, unsigned long end,
			      unsigned migratetype);
extern void free_contig_range(unsigned long pfn, unsigned nr_pages);

/* CMA stuff */
extern void init_cma_reserved_pageblock(struct page *page);

#endif

#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>
6484eb3e	8	#include <linux/mmdebug.h>
1da177e4 LT	9
	10	struct vm_area_struct;
	11
16b56cf4 NK	12	/* Plain integer GFP bitmasks. Do not use this directly. */
	13	#define ___GFP_DMA 0x01u
	14	#define ___GFP_HIGHMEM 0x02u
	15	#define ___GFP_DMA32 0x04u
	16	#define ___GFP_MOVABLE 0x08u
	17	#define ___GFP_WAIT 0x10u
	18	#define ___GFP_HIGH 0x20u
	19	#define ___GFP_IO 0x40u
	20	#define ___GFP_FS 0x80u
	21	#define ___GFP_COLD 0x100u
	22	#define ___GFP_NOWARN 0x200u
	23	#define ___GFP_REPEAT 0x400u
	24	#define ___GFP_NOFAIL 0x800u
	25	#define ___GFP_NORETRY 0x1000u
b37f1dd0	26	#define ___GFP_MEMALLOC 0x2000u
16b56cf4 NK	27	#define ___GFP_COMP 0x4000u
	28	#define ___GFP_ZERO 0x8000u
	29	#define ___GFP_NOMEMALLOC 0x10000u
	30	#define ___GFP_HARDWALL 0x20000u
	31	#define ___GFP_THISNODE 0x40000u
	32	#define ___GFP_RECLAIMABLE 0x80000u
16b56cf4	33	#define ___GFP_NOTRACK 0x200000u
78afd561	34	#define ___GFP_OTHER_NODE 0x800000u
a756cf59	35	#define ___GFP_WRITE 0x1000000u
16b56cf4	36
1da177e4 LT	37	/*
1da177e4 LT	38	* GFP bitmasks..
e53ef38d CL	39	*
	40	* Zone modifiers (see linux/mmzone.h - low three bits)
	41	*
e53ef38d	42	* Do not put any conditional on these. If necessary modify the definitions
263ff5d8	43	* without the underscores and use them consistently. The definitions here may
e53ef38d	44	* be used in bit comparisons.
1da177e4	45	*/
16b56cf4 NK	46	#define __GFP_DMA ((__force gfp_t)___GFP_DMA)
	47	#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM)
	48	#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32)
	49	#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */
b70d94ee	50	#define GFP_ZONEMASK (__GFP_DMA\|__GFP_HIGHMEM\|__GFP_DMA32\|__GFP_MOVABLE)
1da177e4 LT	51	/*
	52	* Action modifiers - doesn't change the zoning
	53	*
	54	* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
	55	* _might_ fail. This depends upon the particular VM implementation.
	56	*
	57	* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
478352e7 DR	58	* cannot handle allocation failures. This modifier is deprecated and no new
478352e7 DR	59	* users should be added.
1da177e4 LT	60	*
1da177e4 LT	61	* __GFP_NORETRY: The VM implementation must not retry indefinitely.
769848c0 MG	62	*
	63	* __GFP_MOVABLE: Flag that this page will be movable by the page migration
	64	* mechanism or reclaimed
1da177e4	65	*/
16b56cf4 NK	66	#define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */
	67	#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */
	68	#define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */
	69	#define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */
	70	#define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */
	71	#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */
	72	#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */
	73	#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */
	74	#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */
b37f1dd0	75	#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
16b56cf4 NK	76	#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */
16b56cf4 NK	77	#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */
b37f1dd0 MG	78	#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves.
	79	* This takes precedence over the
	80	* __GFP_MEMALLOC flag if both are
	81	* set
	82	*/
16b56cf4 NK	83	#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */
	84	#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */
	85	#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
	86	#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
1da177e4	87
78afd561	88	#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
a756cf59	89	#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
32dba98e	90
2dff4405 VN	91	/*
	92	* This may seem redundant, but it's a way of annotating false positives vs.
	93	* allocations that simply cannot be supported (e.g. page tables).
	94	*/
	95	#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
	96
a756cf59	97	#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
af4ca457	98	#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
1da177e4	99
7b04d717 JD	100	/* This equals 0, but use constants in case they ever change */
7b04d717 JD	101	#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
4eac915d	102	/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
1da177e4 LT	103	#define GFP_ATOMIC (__GFP_HIGH)
	104	#define GFP_NOIO (__GFP_WAIT)
	105	#define GFP_NOFS (__GFP_WAIT \| __GFP_IO)
	106	#define GFP_KERNEL (__GFP_WAIT \| __GFP_IO \| __GFP_FS)
e12ba74d MG	107	#define GFP_TEMPORARY (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| \
e12ba74d MG	108	__GFP_RECLAIMABLE)
f90b1d2f PJ	109	#define GFP_USER (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| __GFP_HARDWALL)
	110	#define GFP_HIGHUSER (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| __GFP_HARDWALL \| \
	111	__GFP_HIGHMEM)
769848c0 MG	112	#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT \| __GFP_IO \| __GFP_FS \| \
	113	__GFP_HARDWALL \| __GFP_HIGHMEM \| \
	114	__GFP_MOVABLE)
452aa699	115	#define GFP_IOFS (__GFP_IO \| __GFP_FS)
71e3aac0	116	#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE \| __GFP_COMP \| \
c6543459	117	__GFP_NOMEMALLOC \| __GFP_NORETRY \| __GFP_NOWARN)
1da177e4	118
77f700da	119	#ifdef CONFIG_NUMA
980128f2	120	#define GFP_THISNODE (__GFP_THISNODE \| __GFP_NOWARN \| __GFP_NORETRY)
77f700da	121	#else
f2e97df6	122	#define GFP_THISNODE ((__force gfp_t)0)
77f700da CL	123	#endif
77f700da CL	124
6cb06229	125	/* This mask makes up all the page movable related flags */
e12ba74d	126	#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE\|__GFP_MOVABLE)
6cb06229 CL	127
	128	/* Control page allocator reclaim behavior */
	129	#define GFP_RECLAIM_MASK (__GFP_WAIT\|__GFP_HIGH\|__GFP_IO\|__GFP_FS\|\
	130	__GFP_NOWARN\|__GFP_REPEAT\|__GFP_NOFAIL\|\
b37f1dd0	131	__GFP_NORETRY\|__GFP_MEMALLOC\|__GFP_NOMEMALLOC)
6cb06229	132
7e85ee0c	133	/* Control slab gfp mask during early boot */
fd23855e	134	#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT\|__GFP_IO\|__GFP_FS))
7e85ee0c	135
6cb06229 CL	136	/* Control allocation constraints */
	137	#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL\|__GFP_THISNODE)
	138
	139	/* Do not use these with a slab allocator */
	140	#define GFP_SLAB_BUG_MASK (__GFP_DMA32\|__GFP_HIGHMEM\|~__GFP_BITS_MASK)
980128f2	141
1da177e4 LT	142	/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
	143	platforms, used as appropriate on others */
	144
	145	#define GFP_DMA __GFP_DMA
	146
a2f1b424 AK	147	/* 4GB DMA on some platforms */
	148	#define GFP_DMA32 __GFP_DMA32
	149
467c996c MG	150	/* Convert GFP flags to their corresponding migrate type */
	151	static inline int allocflags_to_migratetype(gfp_t gfp_flags)
	152	{
	153	WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
	154
	155	if (unlikely(page_group_by_mobility_disabled))
	156	return MIGRATE_UNMOVABLE;
	157
	158	/* Group based on mobility */
	159	return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) \|
	160	((gfp_flags & __GFP_RECLAIMABLE) != 0);
	161	}
a2f1b424	162
b70d94ee CL	163	#ifdef CONFIG_HIGHMEM
	164	#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
	165	#else
	166	#define OPT_ZONE_HIGHMEM ZONE_NORMAL
	167	#endif
	168
4b51d669	169	#ifdef CONFIG_ZONE_DMA
b70d94ee CL	170	#define OPT_ZONE_DMA ZONE_DMA
	171	#else
	172	#define OPT_ZONE_DMA ZONE_NORMAL
4b51d669	173	#endif
b70d94ee	174
4e4785bc	175	#ifdef CONFIG_ZONE_DMA32
b70d94ee CL	176	#define OPT_ZONE_DMA32 ZONE_DMA32
	177	#else
	178	#define OPT_ZONE_DMA32 ZONE_NORMAL
4e4785bc	179	#endif
b70d94ee CL	180
	181	/*
	182	* GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
	183	* zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
	184	* and there are 16 of them to cover all possible combinations of
263ff5d8	185	* __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
b70d94ee CL	186	*
	187	* The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
	188	* But GFP_MOVABLE is not only a zone specifier but also an allocation
	189	* policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
263ff5d8	190	* Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
b70d94ee CL	191	*
	192	* bit result
	193	* =================
	194	* 0x0 => NORMAL
	195	* 0x1 => DMA or NORMAL
	196	* 0x2 => HIGHMEM or NORMAL
	197	* 0x3 => BAD (DMA+HIGHMEM)
	198	* 0x4 => DMA32 or DMA or NORMAL
	199	* 0x5 => BAD (DMA+DMA32)
	200	* 0x6 => BAD (HIGHMEM+DMA32)
	201	* 0x7 => BAD (HIGHMEM+DMA32+DMA)
	202	* 0x8 => NORMAL (MOVABLE+0)
	203	* 0x9 => DMA or NORMAL (MOVABLE+DMA)
	204	* 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
	205	* 0xb => BAD (MOVABLE+HIGHMEM+DMA)
	206	* 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32)
	207	* 0xd => BAD (MOVABLE+DMA32+DMA)
	208	* 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
	209	* 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
	210	*
	211	* ZONES_SHIFT must be <= 2 on 32 bit platforms.
	212	*/
	213
	214	#if 16 * ZONES_SHIFT > BITS_PER_LONG
	215	#error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
	216	#endif
	217
	218	#define GFP_ZONE_TABLE ( \
16b56cf4 NK	219	(ZONE_NORMAL << 0 * ZONES_SHIFT) \
	220	\| (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \
	221	\| (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \
	222	\| (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \
	223	\| (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \
	224	\| (OPT_ZONE_DMA << (___GFP_MOVABLE \| ___GFP_DMA) * ZONES_SHIFT) \
	225	\| (ZONE_MOVABLE << (___GFP_MOVABLE \| ___GFP_HIGHMEM) * ZONES_SHIFT) \
	226	\| (OPT_ZONE_DMA32 << (___GFP_MOVABLE \| ___GFP_DMA32) * ZONES_SHIFT) \
b70d94ee CL	227	)
	228
	229	/*
263ff5d8	230	* GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
b70d94ee CL	231	* __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
	232	* entry starting with bit 0. Bit is set if the combination is not
	233	* allowed.
	234	*/
	235	#define GFP_ZONE_BAD ( \
16b56cf4 NK	236	1 << (___GFP_DMA \| ___GFP_HIGHMEM) \
	237	\| 1 << (___GFP_DMA \| ___GFP_DMA32) \
	238	\| 1 << (___GFP_DMA32 \| ___GFP_HIGHMEM) \
	239	\| 1 << (___GFP_DMA \| ___GFP_DMA32 \| ___GFP_HIGHMEM) \
	240	\| 1 << (___GFP_MOVABLE \| ___GFP_HIGHMEM \| ___GFP_DMA) \
	241	\| 1 << (___GFP_MOVABLE \| ___GFP_DMA32 \| ___GFP_DMA) \
	242	\| 1 << (___GFP_MOVABLE \| ___GFP_DMA32 \| ___GFP_HIGHMEM) \
	243	\| 1 << (___GFP_MOVABLE \| ___GFP_DMA32 \| ___GFP_DMA \| ___GFP_HIGHMEM) \
b70d94ee CL	244	)
	245
	246	static inline enum zone_type gfp_zone(gfp_t flags)
	247	{
	248	enum zone_type z;
16b56cf4	249	int bit = (__force int) (flags & GFP_ZONEMASK);
b70d94ee CL	250
	251	z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
	252	((1 << ZONES_SHIFT) - 1);
82d4b577	253	VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
b70d94ee	254	return z;
4e4785bc CL	255	}
4e4785bc CL	256
1da177e4 LT	257	/*
	258	* There is only one page-allocator function, and two main namespaces to
	259	* it. The alloc_page() variants return 'struct page ' and as such
	260	* can allocate highmem pages, the getpage*() variants return
	261	* virtual kernel addresses to the allocated page(s).
	262	*/
	263
54a6eb5c MG	264	static inline int gfp_zonelist(gfp_t flags)
	265	{
	266	if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
	267	return 1;
	268
	269	return 0;
	270	}
	271
1da177e4 LT	272	/*
	273	* We get the zone list from the current node and the gfp_mask.
	274	* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
54a6eb5c MG	275	* There are two zonelists per node, one for all zones with memory and
54a6eb5c MG	276	* one containing just zones from the node the zonelist belongs to.
1da177e4 LT	277	*
	278	* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
	279	* optimized to &contig_page_data at compile-time.
	280	*/
0e88460d MG	281	static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
0e88460d MG	282	{
54a6eb5c	283	return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
0e88460d	284	}
1da177e4 LT	285
	286	#ifndef HAVE_ARCH_FREE_PAGE
	287	static inline void arch_free_page(struct page *page, int order) { }
	288	#endif
cc102509 NP	289	#ifndef HAVE_ARCH_ALLOC_PAGE
	290	static inline void arch_alloc_page(struct page *page, int order) { }
	291	#endif
1da177e4	292
e4048e5d	293	struct page *
d239171e	294	__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
e4048e5d KM	295	struct zonelist zonelist, nodemask_t nodemask);
	296
	297	static inline struct page *
	298	__alloc_pages(gfp_t gfp_mask, unsigned int order,
	299	struct zonelist *zonelist)
	300	{
d239171e	301	return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
e4048e5d KM	302	}
e4048e5d KM	303
dd0fc66f	304	static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
1da177e4 LT	305	unsigned int order)
1da177e4 LT	306	{
819a6928 AK	307	/* Unknown node is current node */
	308	if (nid < 0)
	309	nid = numa_node_id();
	310
0e88460d	311	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
1da177e4 LT	312	}
1da177e4 LT	313
6484eb3e MG	314	static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
	315	unsigned int order)
	316	{
f6d7e0cb	317	VM_BUG_ON(nid < 0 \|\| nid >= MAX_NUMNODES \|\| !node_online(nid));
6484eb3e MG	318
	319	return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
	320	}
	321
1da177e4	322	#ifdef CONFIG_NUMA
dd0fc66f	323	extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
1da177e4 LT	324
1da177e4 LT	325	static inline struct page *
dd0fc66f	326	alloc_pages(gfp_t gfp_mask, unsigned int order)
1da177e4	327	{
1da177e4 LT	328	return alloc_pages_current(gfp_mask, order);
1da177e4 LT	329	}
0bbbc0b3	330	extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
2f5f9486 AK	331	struct vm_area_struct *vma, unsigned long addr,
2f5f9486 AK	332	int node);
1da177e4 LT	333	#else
	334	#define alloc_pages(gfp_mask, order) \
	335	alloc_pages_node(numa_node_id(), gfp_mask, order)
2f5f9486	336	#define alloc_pages_vma(gfp_mask, order, vma, addr, node) \
0bbbc0b3	337	alloc_pages(gfp_mask, order)
1da177e4 LT	338	#endif
1da177e4 LT	339	#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
2f5f9486 AK	340	#define alloc_page_vma(gfp_mask, vma, addr) \
2f5f9486 AK	341	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id())
236344d6 AK	342	#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
236344d6 AK	343	alloc_pages_vma(gfp_mask, 0, vma, addr, node)
1da177e4	344
b3c97528 HH	345	extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
b3c97528 HH	346	extern unsigned long get_zeroed_page(gfp_t gfp_mask);
1da177e4	347
2be0ffe2 TT	348	void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
2be0ffe2 TT	349	void free_pages_exact(void *virt, size_t size);
ee85c2e1 AK	350	/* This is different from alloc_pages_exact_node !!! */
ee85c2e1 AK	351	void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
2be0ffe2	352
1da177e4	353	#define __get_free_page(gfp_mask) \
fd23855e	354	__get_free_pages((gfp_mask), 0)
1da177e4 LT	355
1da177e4 LT	356	#define __get_dma_pages(gfp_mask, order) \
fd23855e	357	__get_free_pages((gfp_mask) \| GFP_DMA, (order))
1da177e4	358
b3c97528 HH	359	extern void __free_pages(struct page *page, unsigned int order);
b3c97528 HH	360	extern void free_pages(unsigned long addr, unsigned int order);
fc91668e	361	extern void free_hot_cold_page(struct page *page, int cold);
cc59850e	362	extern void free_hot_cold_page_list(struct list_head *list, int cold);
1da177e4 LT	363
1da177e4 LT	364	#define __free_page(page) __free_pages((page), 0)
fd23855e	365	#define free_page(addr) free_pages((addr), 0)
1da177e4 LT	366
1da177e4 LT	367	void page_alloc_init(void);
4037d452	368	void drain_zone_pages(struct zone zone, struct per_cpu_pages pcp);
9f8f2172 CL	369	void drain_all_pages(void);
9f8f2172 CL	370	void drain_local_pages(void *dummy);
1da177e4	371
f90ac398 MG	372	/*
	373	* gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
	374	* GFP flags are used before interrupts are enabled. Once interrupts are
	375	* enabled, it is set to __GFP_BITS_MASK while the system is running. During
	376	* hibernation, it is used by PM to avoid I/O during memory allocation while
	377	* devices are suspended.
	378	*/
dcce284a BH	379	extern gfp_t gfp_allowed_mask;
dcce284a BH	380
c93bdd0e MG	381	/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
	382	bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
	383
c9e664f1 RW	384	extern void pm_restrict_gfp_mask(void);
c9e664f1 RW	385	extern void pm_restore_gfp_mask(void);
dcce284a	386
f90ac398 MG	387	#ifdef CONFIG_PM_SLEEP
	388	extern bool pm_suspended_storage(void);
	389	#else
	390	static inline bool pm_suspended_storage(void)
	391	{
	392	return false;
	393	}
	394	#endif /* CONFIG_PM_SLEEP */
	395
041d3a8c MN	396	#ifdef CONFIG_CMA
	397
	398	/* The below functions must be run on a range from a single zone. */
0815f3d8 MN	399	extern int alloc_contig_range(unsigned long start, unsigned long end,
0815f3d8 MN	400	unsigned migratetype);
041d3a8c MN	401	extern void free_contig_range(unsigned long pfn, unsigned nr_pages);
041d3a8c MN	402
47118af0 MN	403	/* CMA stuff */
	404	extern void init_cma_reserved_pageblock(struct page *page);
	405
041d3a8c MN	406	#endif
041d3a8c MN	407
1da177e4	408	#endif /* __LINUX_GFP_H */