| #ifndef __LINUX_GFP_H |
| #define __LINUX_GFP_H |
| |
| #include <linux/mmzone.h> |
| #include <linux/stddef.h> |
| #include <linux/linkage.h> |
| |
| struct vm_area_struct; |
| |
| /* |
| * GFP bitmasks.. |
| * |
| * Zone modifiers (see linux/mmzone.h - low three bits) |
| * |
| * Do not put any conditional on these. If necessary modify the definitions |
| * without the underscores and use the consistently. The definitions here may |
| * be used in bit comparisons. |
| */ |
| #define __GFP_DMA ((__force gfp_t)0x01u) |
| #define __GFP_HIGHMEM ((__force gfp_t)0x02u) |
| #define __GFP_DMA32 ((__force gfp_t)0x04u) |
| |
| /* |
| * Action modifiers - doesn't change the zoning |
| * |
| * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
| * _might_ fail. This depends upon the particular VM implementation. |
| * |
| * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
| * cannot handle allocation failures. |
| * |
| * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
| */ |
| #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
| #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ |
| #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ |
| #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ |
| #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ |
| #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ |
| #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ |
| #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ |
| #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ |
| #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
| #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ |
| #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ |
| #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
| #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
| |
| #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
| #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
| |
| /* if you forget to add the bitmask here kernel will crash, period */ |
| #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ |
| __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ |
| __GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \ |
| __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE) |
| |
| /* This equals 0, but use constants in case they ever change */ |
| #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) |
| /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
| #define GFP_ATOMIC (__GFP_HIGH) |
| #define GFP_NOIO (__GFP_WAIT) |
| #define GFP_NOFS (__GFP_WAIT | __GFP_IO) |
| #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) |
| #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ |
| __GFP_HIGHMEM) |
| |
| #ifdef CONFIG_NUMA |
| #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
| #else |
| #define GFP_THISNODE ((__force gfp_t)0) |
| #endif |
| |
| |
| /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
| platforms, used as appropriate on others */ |
| |
| #define GFP_DMA __GFP_DMA |
| |
| /* 4GB DMA on some platforms */ |
| #define GFP_DMA32 __GFP_DMA32 |
| |
| |
| static inline enum zone_type gfp_zone(gfp_t flags) |
| { |
| #ifdef CONFIG_ZONE_DMA |
| if (flags & __GFP_DMA) |
| return ZONE_DMA; |
| #endif |
| #ifdef CONFIG_ZONE_DMA32 |
| if (flags & __GFP_DMA32) |
| return ZONE_DMA32; |
| #endif |
| #ifdef CONFIG_HIGHMEM |
| if (flags & __GFP_HIGHMEM) |
| return ZONE_HIGHMEM; |
| #endif |
| return ZONE_NORMAL; |
| } |
| |
| /* |
| * There is only one page-allocator function, and two main namespaces to |
| * it. The alloc_page*() variants return 'struct page *' and as such |
| * can allocate highmem pages, the *get*page*() variants return |
| * virtual kernel addresses to the allocated page(s). |
| */ |
| |
| /* |
| * We get the zone list from the current node and the gfp_mask. |
| * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
| * |
| * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| * optimized to &contig_page_data at compile-time. |
| */ |
| |
| #ifndef HAVE_ARCH_FREE_PAGE |
| static inline void arch_free_page(struct page *page, int order) { } |
| #endif |
| #ifndef HAVE_ARCH_ALLOC_PAGE |
| static inline void arch_alloc_page(struct page *page, int order) { } |
| #endif |
| |
| extern struct page * |
| FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
| |
| static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
| unsigned int order) |
| { |
| if (unlikely(order >= MAX_ORDER)) |
| return NULL; |
| |
| /* Unknown node is current node */ |
| if (nid < 0) |
| nid = numa_node_id(); |
| |
| return __alloc_pages(gfp_mask, order, |
| NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
| } |
| |
| #ifdef CONFIG_NUMA |
| extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
| |
| static inline struct page * |
| alloc_pages(gfp_t gfp_mask, unsigned int order) |
| { |
| if (unlikely(order >= MAX_ORDER)) |
| return NULL; |
| |
| return alloc_pages_current(gfp_mask, order); |
| } |
| extern struct page *alloc_page_vma(gfp_t gfp_mask, |
| struct vm_area_struct *vma, unsigned long addr); |
| #else |
| #define alloc_pages(gfp_mask, order) \ |
| alloc_pages_node(numa_node_id(), gfp_mask, order) |
| #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) |
| #endif |
| #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
| |
| extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
| extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); |
| |
| #define __get_free_page(gfp_mask) \ |
| __get_free_pages((gfp_mask),0) |
| |
| #define __get_dma_pages(gfp_mask, order) \ |
| __get_free_pages((gfp_mask) | GFP_DMA,(order)) |
| |
| extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); |
| extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); |
| extern void FASTCALL(free_hot_page(struct page *page)); |
| extern void FASTCALL(free_cold_page(struct page *page)); |
| |
| #define __free_page(page) __free_pages((page), 0) |
| #define free_page(addr) free_pages((addr),0) |
| |
| void page_alloc_init(void); |
| void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
| |
| #endif /* __LINUX_GFP_H */ |