direct-io.hg

view linux-2.6-xen-sparse/include/linux/gfp.h @ 11509:2e6c10dc7c0b

[POWERPC][XEN] make sure put_domain() is called in case of allocate_rma() failuer

Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
author Jimi Xenidis <jimix@watson.ibm.com>
date Tue Sep 12 10:53:46 2006 -0400 (2006-09-12)
parents ea67b8a9c7e0
children 4fad820a2233
line source
1 #ifndef __LINUX_GFP_H
2 #define __LINUX_GFP_H
4 #include <linux/mmzone.h>
5 #include <linux/stddef.h>
6 #include <linux/linkage.h>
7 #include <linux/config.h>
9 struct vm_area_struct;
11 /*
12 * GFP bitmasks..
13 */
14 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */
15 #define __GFP_DMA ((__force gfp_t)0x01u)
16 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
17 #ifdef CONFIG_DMA_IS_DMA32
18 #define __GFP_DMA32 ((__force gfp_t)0x01) /* ZONE_DMA is ZONE_DMA32 */
19 #elif BITS_PER_LONG < 64
20 #define __GFP_DMA32 ((__force gfp_t)0x00) /* ZONE_NORMAL is ZONE_DMA32 */
21 #else
22 #define __GFP_DMA32 ((__force gfp_t)0x04) /* Has own ZONE_DMA32 */
23 #endif
25 /*
26 * Action modifiers - doesn't change the zoning
27 *
28 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
29 * _might_ fail. This depends upon the particular VM implementation.
30 *
31 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
32 * cannot handle allocation failures.
33 *
34 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
35 */
36 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
37 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
38 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
39 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
40 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
41 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
42 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
43 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
44 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
45 #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */
46 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
47 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
48 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
51 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
52 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
54 /* if you forget to add the bitmask here kernel will crash, period */
55 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
56 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
57 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
58 __GFP_NOMEMALLOC|__GFP_HARDWALL)
60 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
61 #define GFP_ATOMIC (__GFP_HIGH)
62 #define GFP_NOIO (__GFP_WAIT)
63 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
64 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
65 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
66 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
67 __GFP_HIGHMEM)
69 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
70 platforms, used as appropriate on others */
72 #define GFP_DMA __GFP_DMA
74 /* 4GB DMA on some platforms */
75 #define GFP_DMA32 __GFP_DMA32
78 static inline int gfp_zone(gfp_t gfp)
79 {
80 int zone = GFP_ZONEMASK & (__force int) gfp;
81 BUG_ON(zone >= GFP_ZONETYPES);
82 return zone;
83 }
85 /*
86 * There is only one page-allocator function, and two main namespaces to
87 * it. The alloc_page*() variants return 'struct page *' and as such
88 * can allocate highmem pages, the *get*page*() variants return
89 * virtual kernel addresses to the allocated page(s).
90 */
92 /*
93 * We get the zone list from the current node and the gfp_mask.
94 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
95 *
96 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
97 * optimized to &contig_page_data at compile-time.
98 */
100 #ifndef HAVE_ARCH_FREE_PAGE
101 /*
102 * If arch_free_page returns non-zero then the generic free_page code can
103 * immediately bail: the arch-specific function has done all the work.
104 */
105 static inline int arch_free_page(struct page *page, int order) { return 0; }
106 #endif
108 extern struct page *
109 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
111 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
112 unsigned int order)
113 {
114 if (unlikely(order >= MAX_ORDER))
115 return NULL;
117 /* Unknown node is current node */
118 if (nid < 0)
119 nid = numa_node_id();
121 return __alloc_pages(gfp_mask, order,
122 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
123 }
125 #ifdef CONFIG_NUMA
126 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
128 static inline struct page *
129 alloc_pages(gfp_t gfp_mask, unsigned int order)
130 {
131 if (unlikely(order >= MAX_ORDER))
132 return NULL;
134 return alloc_pages_current(gfp_mask, order);
135 }
136 extern struct page *alloc_page_vma(gfp_t gfp_mask,
137 struct vm_area_struct *vma, unsigned long addr);
138 #else
139 #define alloc_pages(gfp_mask, order) \
140 alloc_pages_node(numa_node_id(), gfp_mask, order)
141 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
142 #endif
143 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
145 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
146 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
148 #define __get_free_page(gfp_mask) \
149 __get_free_pages((gfp_mask),0)
151 #define __get_dma_pages(gfp_mask, order) \
152 __get_free_pages((gfp_mask) | GFP_DMA,(order))
154 extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
155 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
156 extern void FASTCALL(free_hot_page(struct page *page));
157 extern void FASTCALL(free_cold_page(struct page *page));
159 #define __free_page(page) __free_pages((page), 0)
160 #define free_page(addr) free_pages((addr),0)
162 void page_alloc_init(void);
163 #ifdef CONFIG_NUMA
164 void drain_node_pages(int node);
165 #else
166 static inline void drain_node_pages(int node) { };
167 #endif
169 #endif /* __LINUX_GFP_H */