Root/
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> |
7 | #include <linux/topology.h> |
8 | #include <linux/mmdebug.h> |
9 | |
10 | struct vm_area_struct; |
11 | |
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 |
37 | #define ___GFP_NO_KSWAPD 0x400000u |
38 | #define ___GFP_OTHER_NODE 0x800000u |
39 | |
40 | /* |
41 | * GFP bitmasks.. |
42 | * |
43 | * Zone modifiers (see linux/mmzone.h - low three bits) |
44 | * |
45 | * Do not put any conditional on these. If necessary modify the definitions |
46 | * without the underscores and use them consistently. The definitions here may |
47 | * be used in bit comparisons. |
48 | */ |
49 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
50 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) |
51 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) |
52 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ |
53 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
54 | /* |
55 | * Action modifiers - doesn't change the zoning |
56 | * |
57 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
58 | * _might_ fail. This depends upon the particular VM implementation. |
59 | * |
60 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
61 | * cannot handle allocation failures. This modifier is deprecated and no new |
62 | * users should be added. |
63 | * |
64 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
65 | * |
66 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration |
67 | * mechanism or reclaimed |
68 | */ |
69 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
70 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ |
71 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ |
72 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ |
73 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ |
74 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ |
75 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ |
76 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ |
77 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ |
78 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ |
79 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ |
80 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ |
81 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ |
82 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ |
83 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ |
84 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ |
85 | |
86 | #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
87 | #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
88 | |
89 | /* |
90 | * This may seem redundant, but it's a way of annotating false positives vs. |
91 | * allocations that simply cannot be supported (e.g. page tables). |
92 | */ |
93 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) |
94 | |
95 | #define __GFP_BITS_SHIFT 23 /* Room for 23 __GFP_FOO bits */ |
96 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
97 | |
98 | /* This equals 0, but use constants in case they ever change */ |
99 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) |
100 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
101 | #define GFP_ATOMIC (__GFP_HIGH) |
102 | #define GFP_NOIO (__GFP_WAIT) |
103 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) |
104 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) |
105 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
106 | __GFP_RECLAIMABLE) |
107 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
108 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ |
109 | __GFP_HIGHMEM) |
110 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
111 | __GFP_HARDWALL | __GFP_HIGHMEM | \ |
112 | __GFP_MOVABLE) |
113 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
114 | #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
115 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
116 | __GFP_NO_KSWAPD) |
117 | |
118 | #ifdef CONFIG_NUMA |
119 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
120 | #else |
121 | #define GFP_THISNODE ((__force gfp_t)0) |
122 | #endif |
123 | |
124 | /* This mask makes up all the page movable related flags */ |
125 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
126 | |
127 | /* Control page allocator reclaim behavior */ |
128 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ |
129 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ |
130 | __GFP_NORETRY|__GFP_NOMEMALLOC) |
131 | |
132 | /* Control slab gfp mask during early boot */ |
133 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
134 | |
135 | /* Control allocation constraints */ |
136 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) |
137 | |
138 | /* Do not use these with a slab allocator */ |
139 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) |
140 | |
141 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
142 | platforms, used as appropriate on others */ |
143 | |
144 | #define GFP_DMA __GFP_DMA |
145 | |
146 | /* 4GB DMA on some platforms */ |
147 | #define GFP_DMA32 __GFP_DMA32 |
148 | |
149 | /* Convert GFP flags to their corresponding migrate type */ |
150 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) |
151 | { |
152 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); |
153 | |
154 | if (unlikely(page_group_by_mobility_disabled)) |
155 | return MIGRATE_UNMOVABLE; |
156 | |
157 | /* Group based on mobility */ |
158 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | |
159 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); |
160 | } |
161 | |
162 | #ifdef CONFIG_HIGHMEM |
163 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM |
164 | #else |
165 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL |
166 | #endif |
167 | |
168 | #ifdef CONFIG_ZONE_DMA |
169 | #define OPT_ZONE_DMA ZONE_DMA |
170 | #else |
171 | #define OPT_ZONE_DMA ZONE_NORMAL |
172 | #endif |
173 | |
174 | #ifdef CONFIG_ZONE_DMA32 |
175 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
176 | #else |
177 | #define OPT_ZONE_DMA32 ZONE_NORMAL |
178 | #endif |
179 | |
180 | /* |
181 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the |
182 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long |
183 | * and there are 16 of them to cover all possible combinations of |
184 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
185 | * |
186 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. |
187 | * But GFP_MOVABLE is not only a zone specifier but also an allocation |
188 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. |
189 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
190 | * |
191 | * bit result |
192 | * ================= |
193 | * 0x0 => NORMAL |
194 | * 0x1 => DMA or NORMAL |
195 | * 0x2 => HIGHMEM or NORMAL |
196 | * 0x3 => BAD (DMA+HIGHMEM) |
197 | * 0x4 => DMA32 or DMA or NORMAL |
198 | * 0x5 => BAD (DMA+DMA32) |
199 | * 0x6 => BAD (HIGHMEM+DMA32) |
200 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) |
201 | * 0x8 => NORMAL (MOVABLE+0) |
202 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) |
203 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) |
204 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) |
205 | * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) |
206 | * 0xd => BAD (MOVABLE+DMA32+DMA) |
207 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) |
208 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) |
209 | * |
210 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. |
211 | */ |
212 | |
213 | #if 16 * ZONES_SHIFT > BITS_PER_LONG |
214 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer |
215 | #endif |
216 | |
217 | #define GFP_ZONE_TABLE ( \ |
218 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
219 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ |
220 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ |
221 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ |
222 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ |
223 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ |
224 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ |
225 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ |
226 | ) |
227 | |
228 | /* |
229 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
230 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
231 | * entry starting with bit 0. Bit is set if the combination is not |
232 | * allowed. |
233 | */ |
234 | #define GFP_ZONE_BAD ( \ |
235 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
236 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ |
237 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ |
238 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
239 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ |
240 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ |
241 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
242 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ |
243 | ) |
244 | |
245 | static inline enum zone_type gfp_zone(gfp_t flags) |
246 | { |
247 | enum zone_type z; |
248 | int bit = (__force int) (flags & GFP_ZONEMASK); |
249 | |
250 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & |
251 | ((1 << ZONES_SHIFT) - 1); |
252 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
253 | return z; |
254 | } |
255 | |
256 | /* |
257 | * There is only one page-allocator function, and two main namespaces to |
258 | * it. The alloc_page*() variants return 'struct page *' and as such |
259 | * can allocate highmem pages, the *get*page*() variants return |
260 | * virtual kernel addresses to the allocated page(s). |
261 | */ |
262 | |
263 | static inline int gfp_zonelist(gfp_t flags) |
264 | { |
265 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) |
266 | return 1; |
267 | |
268 | return 0; |
269 | } |
270 | |
271 | /* |
272 | * We get the zone list from the current node and the gfp_mask. |
273 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
274 | * There are two zonelists per node, one for all zones with memory and |
275 | * one containing just zones from the node the zonelist belongs to. |
276 | * |
277 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
278 | * optimized to &contig_page_data at compile-time. |
279 | */ |
280 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
281 | { |
282 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
283 | } |
284 | |
285 | #ifndef HAVE_ARCH_FREE_PAGE |
286 | static inline void arch_free_page(struct page *page, int order) { } |
287 | #endif |
288 | #ifndef HAVE_ARCH_ALLOC_PAGE |
289 | static inline void arch_alloc_page(struct page *page, int order) { } |
290 | #endif |
291 | |
292 | struct page * |
293 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
294 | struct zonelist *zonelist, nodemask_t *nodemask); |
295 | |
296 | static inline struct page * |
297 | __alloc_pages(gfp_t gfp_mask, unsigned int order, |
298 | struct zonelist *zonelist) |
299 | { |
300 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
301 | } |
302 | |
303 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
304 | unsigned int order) |
305 | { |
306 | /* Unknown node is current node */ |
307 | if (nid < 0) |
308 | nid = numa_node_id(); |
309 | |
310 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
311 | } |
312 | |
313 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
314 | unsigned int order) |
315 | { |
316 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); |
317 | |
318 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
319 | } |
320 | |
321 | #ifdef CONFIG_NUMA |
322 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
323 | |
324 | static inline struct page * |
325 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
326 | { |
327 | return alloc_pages_current(gfp_mask, order); |
328 | } |
329 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
330 | struct vm_area_struct *vma, unsigned long addr, |
331 | int node); |
332 | #else |
333 | #define alloc_pages(gfp_mask, order) \ |
334 | alloc_pages_node(numa_node_id(), gfp_mask, order) |
335 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ |
336 | alloc_pages(gfp_mask, order) |
337 | #endif |
338 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
339 | #define alloc_page_vma(gfp_mask, vma, addr) \ |
340 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) |
341 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
342 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) |
343 | |
344 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
345 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); |
346 | |
347 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
348 | void free_pages_exact(void *virt, size_t size); |
349 | /* This is different from alloc_pages_exact_node !!! */ |
350 | void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); |
351 | |
352 | #define __get_free_page(gfp_mask) \ |
353 | __get_free_pages((gfp_mask), 0) |
354 | |
355 | #define __get_dma_pages(gfp_mask, order) \ |
356 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
357 | |
358 | extern void __free_pages(struct page *page, unsigned int order); |
359 | extern void free_pages(unsigned long addr, unsigned int order); |
360 | extern void free_hot_cold_page(struct page *page, int cold); |
361 | |
362 | #define __free_page(page) __free_pages((page), 0) |
363 | #define free_page(addr) free_pages((addr), 0) |
364 | |
365 | void page_alloc_init(void); |
366 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
367 | void drain_all_pages(void); |
368 | void drain_local_pages(void *dummy); |
369 | |
370 | extern gfp_t gfp_allowed_mask; |
371 | |
372 | extern void pm_restrict_gfp_mask(void); |
373 | extern void pm_restore_gfp_mask(void); |
374 | |
375 | #endif /* __LINUX_GFP_H */ |
376 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9