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| #ifndef __LINUX_GFP_H |
| #define __LINUX_GFP_H |
| |
| #include <linux/mmdebug.h> |
| #include <linux/types.h> |
| #include <linux/stddef.h> |
| #include <linux/linkage.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_NO_KSWAPD 0x400000u |
| #define ___GFP_OTHER_NODE 0x800000u |
| #define ___GFP_WRITE 0x1000000u |
| /* If the above are modified, __GFP_BITS_SHIFT may need updating */ |
| |
| /* |
| * 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_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
| #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_USER | __GFP_HIGHMEM) |
| #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) |
| #define GFP_IOFS (__GFP_IO | __GFP_FS) |
| #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
| __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
| __GFP_NO_KSWAPD) |
| |
| /* |
| * GFP_THISNODE does not perform any reclaim, you most likely want to |
| * use __GFP_THISNODE to allocate from a given node without fallback! |
| */ |
| #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 |
| |
| |
| #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+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) \ |
| ) |
| |
| |
| #endif /* __LINUX_GFP_H */ |