http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/gfp.h

#ifndef __LINUX_GFP_H #define __LINUX_GFP_H #include <linux/mmzone.h> #include <linux/stddef.h> #include <linux/linkage.h> #include <linux/config.h> struct vm_area_struct; /* * GFP bitmasks.. */ /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */ #define __GFP_DMA ((__force gfp_t)0x01u) #define __GFP_HIGHMEM ((__force gfp_t)0x02u) #ifdef CONFIG_DMA_IS_DMA32 #define __GFP_DMA32 ((__force gfp_t)0x01) /* ZONE_DMA is ZONE_DMA32 */ #elif BITS_PER_LONG < 64 #define __GFP_DMA32 ((__force gfp_t)0x00) /* ZONE_NORMAL is ZONE_DMA32 */ #else #define __GFP_DMA32 ((__force gfp_t)0x04) /* Has own ZONE_DMA32 */ #endif /* * 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_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */ #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_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_NO_GROW|__GFP_COMP| \ __GFP_NOMEMALLOC|__GFP_HARDWALL) /* 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) /* 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 int gfp_zone(gfp_t gfp) { int zone = GFP_ZONEMASK & (__force int) gfp; BUG_ON(zone >= GFP_ZONETYPES); return zone; } /* * 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 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); #ifdef CONFIG_NUMA void drain_node_pages(int node); #else static inline void drain_node_pages(int node) { }; #endif #endif /* __LINUX_GFP_H */