4 #include <linux/mmzone.h>
5 #include <linux/stddef.h>
6 #include <linux/linkage.h>
10 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
11 #define __GFP_DMA 0x01
12 #define __GFP_HIGHMEM 0x02
15 * Action modifiers - doesn't change the zoning
17 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
18 * _might_ fail. This depends upon the particular VM implementation.
20 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
21 * cannot handle allocation failures.
23 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
25 #define __GFP_WAIT 0x10 /* Can wait and reschedule? */
26 #define __GFP_HIGH 0x20 /* Should access emergency pools? */
27 #define __GFP_IO 0x40 /* Can start physical IO? */
28 #define __GFP_FS 0x80 /* Can call down to low-level FS? */
29 #define __GFP_COLD 0x100 /* Cache-cold page required */
30 #define __GFP_NOWARN 0x200 /* Suppress page allocation failure warning */
31 #define __GFP_REPEAT 0x400 /* Retry the allocation. Might fail */
32 #define __GFP_NOFAIL 0x800 /* Retry for ever. Cannot fail */
33 #define __GFP_NORETRY 0x1000 /* Do not retry. Might fail */
34 #define __GFP_NO_GROW 0x2000 /* Slab internal usage */
35 #define __GFP_COMP 0x4000 /* Add compound page metadata */
37 #define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */
38 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
40 /* if you forget to add the bitmask here kernel will crash, period */
41 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
42 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
43 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP)
45 #define GFP_ATOMIC (__GFP_HIGH)
46 #define GFP_NOIO (__GFP_WAIT)
47 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
48 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
49 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS)
50 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM)
52 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
53 platforms, used as appropriate on others */
55 #define GFP_DMA __GFP_DMA
59 * There is only one page-allocator function, and two main namespaces to
60 * it. The alloc_page*() variants return 'struct page *' and as such
61 * can allocate highmem pages, the *get*page*() variants return
62 * virtual kernel addresses to the allocated page(s).
66 * We get the zone list from the current node and the gfp_mask.
67 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
69 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
70 * optimized to &contig_page_data at compile-time.
72 extern struct page * FASTCALL(__alloc_pages(unsigned int, unsigned int, struct zonelist *));
73 static inline struct page * alloc_pages_node(int nid, unsigned int gfp_mask, unsigned int order)
75 if (unlikely(order >= MAX_ORDER))
78 return __alloc_pages(gfp_mask, order, NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
81 #define alloc_pages(gfp_mask, order) \
82 alloc_pages_node(numa_node_id(), gfp_mask, order)
83 #define alloc_page(gfp_mask) \
84 alloc_pages_node(numa_node_id(), gfp_mask, 0)
86 extern unsigned long FASTCALL(__get_free_pages(unsigned int gfp_mask, unsigned int order));
87 extern unsigned long FASTCALL(get_zeroed_page(unsigned int gfp_mask));
89 #define __get_free_page(gfp_mask) \
90 __get_free_pages((gfp_mask),0)
92 #define __get_dma_pages(gfp_mask, order) \
93 __get_free_pages((gfp_mask) | GFP_DMA,(order))
95 extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
96 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
97 extern void FASTCALL(free_hot_page(struct page *page));
98 extern void FASTCALL(free_cold_page(struct page *page));
100 #define __free_page(page) __free_pages((page), 0)
101 #define free_page(addr) free_pages((addr),0)
103 void page_alloc_init(void);
105 #endif /* __LINUX_GFP_H */