Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Rusty Russell | 082edb7 | 2009-03-13 23:43:37 +1030 | [diff] [blame] | 7 | #include <linux/topology.h> |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 8 | #include <linux/mmdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
| 10 | struct vm_area_struct; |
| 11 | |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 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 |
| 26 | #define ___GFP_COMP 0x4000u |
| 27 | #define ___GFP_ZERO 0x8000u |
| 28 | #define ___GFP_NOMEMALLOC 0x10000u |
| 29 | #define ___GFP_HARDWALL 0x20000u |
| 30 | #define ___GFP_THISNODE 0x40000u |
| 31 | #define ___GFP_RECLAIMABLE 0x80000u |
| 32 | #ifdef CONFIG_KMEMCHECK |
| 33 | #define ___GFP_NOTRACK 0x200000u |
| 34 | #else |
| 35 | #define ___GFP_NOTRACK 0 |
| 36 | #endif |
Andrea Arcangeli | 32dba98 | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 37 | #define ___GFP_NO_KSWAPD 0x400000u |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 38 | #define ___GFP_OTHER_NODE 0x800000u |
Johannes Weiner | a756cf5 | 2012-01-10 15:07:49 -0800 | [diff] [blame] | 39 | #define ___GFP_WRITE 0x1000000u |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | /* |
| 42 | * GFP bitmasks.. |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 43 | * |
| 44 | * Zone modifiers (see linux/mmzone.h - low three bits) |
| 45 | * |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 46 | * Do not put any conditional on these. If necessary modify the definitions |
matt mooney | 263ff5d | 2010-05-24 14:32:44 -0700 | [diff] [blame] | 47 | * without the underscores and use them consistently. The definitions here may |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 48 | * be used in bit comparisons. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | */ |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 50 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
| 51 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) |
| 52 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) |
| 53 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 54 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | /* |
| 56 | * Action modifiers - doesn't change the zoning |
| 57 | * |
| 58 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
| 59 | * _might_ fail. This depends upon the particular VM implementation. |
| 60 | * |
| 61 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
David Rientjes | 478352e | 2010-03-05 13:42:23 -0800 | [diff] [blame] | 62 | * cannot handle allocation failures. This modifier is deprecated and no new |
| 63 | * users should be added. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | * |
| 65 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 66 | * |
| 67 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration |
| 68 | * mechanism or reclaimed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | */ |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 70 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
| 71 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ |
| 72 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ |
| 73 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ |
| 74 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ |
| 75 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ |
| 76 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ |
| 77 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ |
| 78 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ |
| 79 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ |
| 80 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ |
| 81 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ |
| 82 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ |
| 83 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ |
| 84 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ |
| 85 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Andrea Arcangeli | 32dba98 | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 87 | #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 88 | #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
Johannes Weiner | a756cf5 | 2012-01-10 15:07:49 -0800 | [diff] [blame] | 89 | #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ |
Andrea Arcangeli | 32dba98 | 2011-01-13 15:46:49 -0800 | [diff] [blame] | 90 | |
Vegard Nossum | 2dff440 | 2008-05-31 15:56:17 +0200 | [diff] [blame] | 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 | |
Johannes Weiner | a756cf5 | 2012-01-10 15:07:49 -0800 | [diff] [blame] | 97 | #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 98 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Jeff Dike | 7b04d71 | 2006-04-10 22:53:27 -0700 | [diff] [blame] | 100 | /* This equals 0, but use constants in case they ever change */ |
| 101 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) |
Paul Jackson | 4eac915 | 2006-01-11 12:17:19 -0800 | [diff] [blame] | 102 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 107 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
| 108 | __GFP_RECLAIMABLE) |
Paul Jackson | f90b1d2 | 2005-09-06 15:18:10 -0700 | [diff] [blame] | 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) |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 112 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
| 113 | __GFP_HARDWALL | __GFP_HIGHMEM | \ |
| 114 | __GFP_MOVABLE) |
Rafael J. Wysocki | 452aa69 | 2010-03-05 13:42:13 -0800 | [diff] [blame] | 115 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
Andrea Arcangeli | 71e3aac | 2011-01-13 15:46:52 -0800 | [diff] [blame] | 116 | #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
| 117 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
| 118 | __GFP_NO_KSWAPD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 120 | #ifdef CONFIG_NUMA |
Christoph Lameter | 980128f | 2006-09-25 23:31:46 -0700 | [diff] [blame] | 121 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 122 | #else |
Al Viro | f2e97df | 2007-02-09 16:38:55 +0000 | [diff] [blame] | 123 | #define GFP_THISNODE ((__force gfp_t)0) |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 124 | #endif |
| 125 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 126 | /* This mask makes up all the page movable related flags */ |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 127 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 128 | |
| 129 | /* Control page allocator reclaim behavior */ |
| 130 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ |
| 131 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ |
| 132 | __GFP_NORETRY|__GFP_NOMEMALLOC) |
| 133 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 134 | /* Control slab gfp mask during early boot */ |
matt mooney | fd23855 | 2010-05-24 14:32:45 -0700 | [diff] [blame] | 135 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 136 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 137 | /* Control allocation constraints */ |
| 138 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) |
| 139 | |
| 140 | /* Do not use these with a slab allocator */ |
| 141 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) |
Christoph Lameter | 980128f | 2006-09-25 23:31:46 -0700 | [diff] [blame] | 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
| 144 | platforms, used as appropriate on others */ |
| 145 | |
| 146 | #define GFP_DMA __GFP_DMA |
| 147 | |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 148 | /* 4GB DMA on some platforms */ |
| 149 | #define GFP_DMA32 __GFP_DMA32 |
| 150 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 151 | /* Convert GFP flags to their corresponding migrate type */ |
| 152 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) |
| 153 | { |
| 154 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); |
| 155 | |
| 156 | if (unlikely(page_group_by_mobility_disabled)) |
| 157 | return MIGRATE_UNMOVABLE; |
| 158 | |
| 159 | /* Group based on mobility */ |
| 160 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | |
| 161 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); |
| 162 | } |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 163 | |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 164 | #ifdef CONFIG_HIGHMEM |
| 165 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM |
| 166 | #else |
| 167 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL |
| 168 | #endif |
| 169 | |
| 170 | #ifdef CONFIG_ZONE_DMA |
| 171 | #define OPT_ZONE_DMA ZONE_DMA |
| 172 | #else |
| 173 | #define OPT_ZONE_DMA ZONE_NORMAL |
| 174 | #endif |
| 175 | |
| 176 | #ifdef CONFIG_ZONE_DMA32 |
| 177 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
| 178 | #else |
| 179 | #define OPT_ZONE_DMA32 ZONE_NORMAL |
| 180 | #endif |
| 181 | |
| 182 | /* |
| 183 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the |
| 184 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long |
| 185 | * and there are 16 of them to cover all possible combinations of |
matt mooney | 263ff5d | 2010-05-24 14:32:44 -0700 | [diff] [blame] | 186 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 187 | * |
| 188 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. |
| 189 | * But GFP_MOVABLE is not only a zone specifier but also an allocation |
| 190 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. |
matt mooney | 263ff5d | 2010-05-24 14:32:44 -0700 | [diff] [blame] | 191 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 192 | * |
| 193 | * bit result |
| 194 | * ================= |
| 195 | * 0x0 => NORMAL |
| 196 | * 0x1 => DMA or NORMAL |
| 197 | * 0x2 => HIGHMEM or NORMAL |
| 198 | * 0x3 => BAD (DMA+HIGHMEM) |
| 199 | * 0x4 => DMA32 or DMA or NORMAL |
| 200 | * 0x5 => BAD (DMA+DMA32) |
| 201 | * 0x6 => BAD (HIGHMEM+DMA32) |
| 202 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) |
| 203 | * 0x8 => NORMAL (MOVABLE+0) |
| 204 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) |
| 205 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) |
| 206 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) |
| 207 | * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) |
| 208 | * 0xd => BAD (MOVABLE+DMA32+DMA) |
| 209 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) |
| 210 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) |
| 211 | * |
| 212 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. |
| 213 | */ |
| 214 | |
| 215 | #if 16 * ZONES_SHIFT > BITS_PER_LONG |
| 216 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer |
| 217 | #endif |
| 218 | |
| 219 | #define GFP_ZONE_TABLE ( \ |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 220 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
| 221 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ |
| 222 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ |
| 223 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ |
| 224 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ |
| 225 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ |
| 226 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ |
| 227 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 228 | ) |
| 229 | |
| 230 | /* |
matt mooney | 263ff5d | 2010-05-24 14:32:44 -0700 | [diff] [blame] | 231 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 232 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
| 233 | * entry starting with bit 0. Bit is set if the combination is not |
| 234 | * allowed. |
| 235 | */ |
| 236 | #define GFP_ZONE_BAD ( \ |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 237 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
| 238 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ |
| 239 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| 240 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| 241 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ |
| 242 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ |
| 243 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| 244 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 245 | ) |
| 246 | |
Christoph Lameter | 19655d3 | 2006-09-25 23:31:19 -0700 | [diff] [blame] | 247 | static inline enum zone_type gfp_zone(gfp_t flags) |
Christoph Lameter | 4e4785b | 2006-09-25 23:31:17 -0700 | [diff] [blame] | 248 | { |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 249 | enum zone_type z; |
Namhyung Kim | 16b56cf | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 250 | int bit = (__force int) (flags & GFP_ZONEMASK); |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 251 | |
| 252 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & |
| 253 | ((1 << ZONES_SHIFT) - 1); |
Dave Hansen | 82d4b57 | 2011-05-24 17:11:42 -0700 | [diff] [blame] | 254 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
Christoph Lameter | b70d94e | 2009-06-16 15:32:46 -0700 | [diff] [blame] | 255 | return z; |
Christoph Lameter | 4e4785b | 2006-09-25 23:31:17 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | /* |
| 259 | * There is only one page-allocator function, and two main namespaces to |
| 260 | * it. The alloc_page*() variants return 'struct page *' and as such |
| 261 | * can allocate highmem pages, the *get*page*() variants return |
| 262 | * virtual kernel addresses to the allocated page(s). |
| 263 | */ |
| 264 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 265 | static inline int gfp_zonelist(gfp_t flags) |
| 266 | { |
| 267 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) |
| 268 | return 1; |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* |
| 274 | * We get the zone list from the current node and the gfp_mask. |
| 275 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 276 | * There are two zonelists per node, one for all zones with memory and |
| 277 | * one containing just zones from the node the zonelist belongs to. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | * |
| 279 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| 280 | * optimized to &contig_page_data at compile-time. |
| 281 | */ |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 282 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
| 283 | { |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 284 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 285 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | #ifndef HAVE_ARCH_FREE_PAGE |
| 288 | static inline void arch_free_page(struct page *page, int order) { } |
| 289 | #endif |
Nick Piggin | cc102509 | 2006-12-06 20:32:00 -0800 | [diff] [blame] | 290 | #ifndef HAVE_ARCH_ALLOC_PAGE |
| 291 | static inline void arch_alloc_page(struct page *page, int order) { } |
| 292 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
KOSAKI Motohiro | e4048e5 | 2008-07-23 21:27:01 -0700 | [diff] [blame] | 294 | struct page * |
Mel Gorman | d239171 | 2009-06-16 15:31:52 -0700 | [diff] [blame] | 295 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
KOSAKI Motohiro | e4048e5 | 2008-07-23 21:27:01 -0700 | [diff] [blame] | 296 | struct zonelist *zonelist, nodemask_t *nodemask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
KOSAKI Motohiro | e4048e5 | 2008-07-23 21:27:01 -0700 | [diff] [blame] | 298 | static inline struct page * |
| 299 | __alloc_pages(gfp_t gfp_mask, unsigned int order, |
| 300 | struct zonelist *zonelist) |
| 301 | { |
Mel Gorman | d239171 | 2009-06-16 15:31:52 -0700 | [diff] [blame] | 302 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
KOSAKI Motohiro | e4048e5 | 2008-07-23 21:27:01 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 305 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | unsigned int order) |
| 307 | { |
Andi Kleen | 819a692 | 2006-01-11 22:43:45 +0100 | [diff] [blame] | 308 | /* Unknown node is current node */ |
| 309 | if (nid < 0) |
| 310 | nid = numa_node_id(); |
| 311 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 312 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } |
| 314 | |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 315 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
| 316 | unsigned int order) |
| 317 | { |
David Rientjes | f6d7e0c | 2012-01-10 15:07:38 -0800 | [diff] [blame] | 318 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 319 | |
| 320 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
| 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | #ifdef CONFIG_NUMA |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 324 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | static inline struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 327 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | return alloc_pages_current(gfp_mask, order); |
| 330 | } |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 331 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 332 | struct vm_area_struct *vma, unsigned long addr, |
| 333 | int node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | #else |
| 335 | #define alloc_pages(gfp_mask, order) \ |
| 336 | alloc_pages_node(numa_node_id(), gfp_mask, order) |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 337 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 338 | alloc_pages(gfp_mask, order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | #endif |
| 340 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 341 | #define alloc_page_vma(gfp_mask, vma, addr) \ |
| 342 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) |
Andi Kleen | 236344d | 2011-03-04 17:36:30 -0800 | [diff] [blame] | 343 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
| 344 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 346 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
| 347 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Timur Tabi | 2be0ffe | 2008-07-23 21:28:11 -0700 | [diff] [blame] | 349 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
| 350 | void free_pages_exact(void *virt, size_t size); |
Andi Kleen | ee85c2e | 2011-05-11 15:13:34 -0700 | [diff] [blame] | 351 | /* This is different from alloc_pages_exact_node !!! */ |
| 352 | void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); |
Timur Tabi | 2be0ffe | 2008-07-23 21:28:11 -0700 | [diff] [blame] | 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | #define __get_free_page(gfp_mask) \ |
matt mooney | fd23855 | 2010-05-24 14:32:45 -0700 | [diff] [blame] | 355 | __get_free_pages((gfp_mask), 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | #define __get_dma_pages(gfp_mask, order) \ |
matt mooney | fd23855 | 2010-05-24 14:32:45 -0700 | [diff] [blame] | 358 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 360 | extern void __free_pages(struct page *page, unsigned int order); |
| 361 | extern void free_pages(unsigned long addr, unsigned int order); |
Li Hong | fc91668 | 2010-03-05 13:41:54 -0800 | [diff] [blame] | 362 | extern void free_hot_cold_page(struct page *page, int cold); |
Konstantin Khlebnikov | cc59850 | 2012-01-10 15:07:04 -0800 | [diff] [blame] | 363 | extern void free_hot_cold_page_list(struct list_head *list, int cold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
| 365 | #define __free_page(page) __free_pages((page), 0) |
matt mooney | fd23855 | 2010-05-24 14:32:45 -0700 | [diff] [blame] | 366 | #define free_page(addr) free_pages((addr), 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | void page_alloc_init(void); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 369 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 370 | void drain_all_pages(void); |
| 371 | void drain_local_pages(void *dummy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 373 | /* |
| 374 | * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what |
| 375 | * GFP flags are used before interrupts are enabled. Once interrupts are |
| 376 | * enabled, it is set to __GFP_BITS_MASK while the system is running. During |
| 377 | * hibernation, it is used by PM to avoid I/O during memory allocation while |
| 378 | * devices are suspended. |
| 379 | */ |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 380 | extern gfp_t gfp_allowed_mask; |
| 381 | |
Rafael J. Wysocki | c9e664f | 2010-12-03 22:57:45 +0100 | [diff] [blame] | 382 | extern void pm_restrict_gfp_mask(void); |
| 383 | extern void pm_restore_gfp_mask(void); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 384 | |
Mel Gorman | f90ac39 | 2012-01-10 15:07:15 -0800 | [diff] [blame] | 385 | #ifdef CONFIG_PM_SLEEP |
| 386 | extern bool pm_suspended_storage(void); |
| 387 | #else |
| 388 | static inline bool pm_suspended_storage(void) |
| 389 | { |
| 390 | return false; |
| 391 | } |
| 392 | #endif /* CONFIG_PM_SLEEP */ |
| 393 | |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 394 | #ifdef CONFIG_CMA |
| 395 | |
| 396 | /* The below functions must be run on a range from a single zone. */ |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 397 | extern int alloc_contig_range(unsigned long start, unsigned long end, |
| 398 | unsigned migratetype); |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 399 | extern void free_contig_range(unsigned long pfn, unsigned nr_pages); |
| 400 | |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 401 | /* CMA stuff */ |
| 402 | extern void init_cma_reserved_pageblock(struct page *page); |
| 403 | |
Michal Nazarewicz | 041d3a8 | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 404 | #endif |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | #endif /* __LINUX_GFP_H */ |