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1da177e4 LT |
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/config.h> | |
8 | ||
9 | struct vm_area_struct; | |
10 | ||
11 | /* | |
12 | * GFP bitmasks.. | |
13 | */ | |
14 | /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */ | |
15 | #define __GFP_DMA 0x01 | |
16 | #define __GFP_HIGHMEM 0x02 | |
17 | ||
18 | /* | |
19 | * Action modifiers - doesn't change the zoning | |
20 | * | |
21 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
22 | * _might_ fail. This depends upon the particular VM implementation. | |
23 | * | |
24 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
25 | * cannot handle allocation failures. | |
26 | * | |
27 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
28 | */ | |
29 | #define __GFP_WAIT 0x10u /* Can wait and reschedule? */ | |
30 | #define __GFP_HIGH 0x20u /* Should access emergency pools? */ | |
31 | #define __GFP_IO 0x40u /* Can start physical IO? */ | |
32 | #define __GFP_FS 0x80u /* Can call down to low-level FS? */ | |
33 | #define __GFP_COLD 0x100u /* Cache-cold page required */ | |
34 | #define __GFP_NOWARN 0x200u /* Suppress page allocation failure warning */ | |
35 | #define __GFP_REPEAT 0x400u /* Retry the allocation. Might fail */ | |
36 | #define __GFP_NOFAIL 0x800u /* Retry for ever. Cannot fail */ | |
37 | #define __GFP_NORETRY 0x1000u /* Do not retry. Might fail */ | |
38 | #define __GFP_NO_GROW 0x2000u /* Slab internal usage */ | |
39 | #define __GFP_COMP 0x4000u /* Add compound page metadata */ | |
40 | #define __GFP_ZERO 0x8000u /* Return zeroed page on success */ | |
b84a35be | 41 | #define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */ |
1da177e4 | 42 | |
b84a35be | 43 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
1da177e4 LT |
44 | #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1) |
45 | ||
46 | /* if you forget to add the bitmask here kernel will crash, period */ | |
47 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ | |
48 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ | |
b84a35be NP |
49 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ |
50 | __GFP_NOMEMALLOC) | |
1da177e4 LT |
51 | |
52 | #define GFP_ATOMIC (__GFP_HIGH) | |
53 | #define GFP_NOIO (__GFP_WAIT) | |
54 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
55 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
56 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
57 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM) | |
58 | ||
59 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some | |
60 | platforms, used as appropriate on others */ | |
61 | ||
62 | #define GFP_DMA __GFP_DMA | |
63 | ||
64 | ||
65 | /* | |
66 | * There is only one page-allocator function, and two main namespaces to | |
67 | * it. The alloc_page*() variants return 'struct page *' and as such | |
68 | * can allocate highmem pages, the *get*page*() variants return | |
69 | * virtual kernel addresses to the allocated page(s). | |
70 | */ | |
71 | ||
72 | /* | |
73 | * We get the zone list from the current node and the gfp_mask. | |
74 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
75 | * | |
76 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
77 | * optimized to &contig_page_data at compile-time. | |
78 | */ | |
79 | ||
80 | #ifndef HAVE_ARCH_FREE_PAGE | |
81 | static inline void arch_free_page(struct page *page, int order) { } | |
82 | #endif | |
83 | ||
84 | extern struct page * | |
85 | FASTCALL(__alloc_pages(unsigned int, unsigned int, struct zonelist *)); | |
86 | ||
87 | static inline struct page *alloc_pages_node(int nid, unsigned int __nocast gfp_mask, | |
88 | unsigned int order) | |
89 | { | |
90 | if (unlikely(order >= MAX_ORDER)) | |
91 | return NULL; | |
92 | ||
93 | return __alloc_pages(gfp_mask, order, | |
94 | NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK)); | |
95 | } | |
96 | ||
97 | #ifdef CONFIG_NUMA | |
98 | extern struct page *alloc_pages_current(unsigned int __nocast gfp_mask, unsigned order); | |
99 | ||
100 | static inline struct page * | |
101 | alloc_pages(unsigned int __nocast gfp_mask, unsigned int order) | |
102 | { | |
103 | if (unlikely(order >= MAX_ORDER)) | |
104 | return NULL; | |
105 | ||
106 | return alloc_pages_current(gfp_mask, order); | |
107 | } | |
108 | extern struct page *alloc_page_vma(unsigned __nocast gfp_mask, | |
109 | struct vm_area_struct *vma, unsigned long addr); | |
110 | #else | |
111 | #define alloc_pages(gfp_mask, order) \ | |
112 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
113 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
114 | #endif | |
115 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
116 | ||
117 | extern unsigned long FASTCALL(__get_free_pages(unsigned int __nocast gfp_mask, unsigned int order)); | |
118 | extern unsigned long FASTCALL(get_zeroed_page(unsigned int __nocast gfp_mask)); | |
119 | ||
120 | #define __get_free_page(gfp_mask) \ | |
121 | __get_free_pages((gfp_mask),0) | |
122 | ||
123 | #define __get_dma_pages(gfp_mask, order) \ | |
124 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
125 | ||
126 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); | |
127 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); | |
128 | extern void FASTCALL(free_hot_page(struct page *page)); | |
129 | extern void FASTCALL(free_cold_page(struct page *page)); | |
130 | ||
131 | #define __free_page(page) __free_pages((page), 0) | |
132 | #define free_page(addr) free_pages((addr),0) | |
133 | ||
134 | void page_alloc_init(void); | |
135 | ||
136 | #endif /* __LINUX_GFP_H */ |