source: GPL/trunk/include/linux/gfp.h

#ifndef __LINUX_GFP_H
#define __LINUX_GFP_H

#include <linux/types.h>

/*
 * GFP bitmasks..
 */
#define __GFP_WAIT      0x01
#define __GFP_LOW       0x02
#define __GFP_MED       0x04
#define __GFP_HIGH      0x08
#define __GFP_IO        0x10
#define __GFP_SWAP      0x20

/* 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_RECLAIMABLE      0x10u
#define ___GFP_HIGH             0x20u
#define ___GFP_IO               0x40u
#define ___GFP_FS               0x80u
#define ___GFP_ZERO             0x100u
#define ___GFP_ATOMIC           0x200u
#define ___GFP_DIRECT_RECLAIM   0x400u
#define ___GFP_KSWAPD_RECLAIM   0x800u
#define ___GFP_WRITE            0x1000u
#define ___GFP_NOWARN           0x2000u
#define ___GFP_RETRY_MAYFAIL    0x4000u
#define ___GFP_NOFAIL           0x8000u
#define ___GFP_NORETRY          0x10000u
#define ___GFP_MEMALLOC         0x20000u
#define ___GFP_COMP             0x40000u
#define ___GFP_NOMEMALLOC       0x80000u
#define ___GFP_HARDWALL         0x100000u
#define ___GFP_THISNODE         0x200000u
#define ___GFP_ACCOUNT          0x400000u
#ifdef CONFIG_LOCKDEP
#define ___GFP_NOLOCKDEP        0x800000u
#else
#define ___GFP_NOLOCKDEP        0
#endif
/* If the above are modified, __GFP_BITS_SHIFT may need updating */

#define __GFP_NORETRY   0
#define __GFP_NOWARN    ((__force gfp_t)___GFP_NOWARN)
#define __GFP_COMP      ((__force gfp_t)___GFP_COMP)
#define __GFP_ZERO      ((__force gfp_t)___GFP_ZERO)
#define __GFP_RETRY_MAYFAIL     ((__force gfp_t)___GFP_RETRY_MAYFAIL)
#define GFP_DMA32 0             /* driver must check for 32-bit address */
#define GFP_BUFFER      (__GFP_LOW | __GFP_WAIT)
#define GFP_ATOMIC      (__GFP_HIGH)
#define GFP_USER        (__GFP_LOW | __GFP_WAIT | __GFP_IO)
#define GFP_HIGHUSER    (GFP_USER | __GFP_HIGHMEM)
#define GFP_KERNEL      (__GFP_MED | __GFP_WAIT | __GFP_IO)
#define GFP_NFS         (__GFP_HIGH | __GFP_WAIT | __GFP_IO)
#define GFP_KSWAPD      (__GFP_IO | __GFP_SWAP)


/*
 * Physical address zone modifiers (see linux/mmzone.h - low four 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)  /* ZONE_MOVABLE allowed */
#define GFP_ZONEMASK    (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
/* Flag - indicates that the buffer will be suitable for DMA.  Ignored on some
   platforms, used as appropriate on others */

#define GFP_DMA         __GFP_DMA

/* Flag - indicates that the buffer can be taken from high memory which is not
   directly addressable by the kernel */

#define GFP_HIGHMEM     __GFP_HIGHMEM
#define __GFP_DMAHIGHMEM  0x100
#define GFP_DMAHIGHMEM    __GFP_DMAHIGHMEM

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

#endif /* __LINUX_GFP_H */