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#ifndef __LINUX_GFP_H #define __LINUX_GFP_H #include <linux/mmzone.h> #include <linux/stddef.h> #include <linux/linkage.h> /* * GFP bitmasks.. */ /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low four bits) */ #define __GFP_DMA 0x01 #define __GFP_HIGHMEM 0x02 /* Action modifiers - doesn't change the zoning */ #define __GFP_WAIT 0x10 /* Can wait and reschedule? */ #define __GFP_HIGH 0x20 /* Should access emergency pools? */ #define __GFP_IO 0x40 /* Can start low memory physical IO? */ #define __GFP_HIGHIO 0x80 /* Can start high mem physical IO? */ #define __GFP_FS 0x100 /* Can call down to low-level FS? */ #define GFP_NOHIGHIO ( __GFP_WAIT | __GFP_IO) #define GFP_NOIO ( __GFP_WAIT) #define GFP_NOFS ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO) #define GFP_ATOMIC (__GFP_HIGH) #define GFP_USER ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO | __GFP_FS) #define GFP_HIGHUSER ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO | __GFP_FS | __GFP_HIGHMEM) #define GFP_KERNEL ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO | __GFP_FS) #define GFP_NFS ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO | __GFP_FS) #define GFP_KSWAPD ( __GFP_WAIT | __GFP_IO | __GFP_HIGHIO | __GFP_FS) /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some platforms, used as appropriate on others */ #define GFP_DMA __GFP_DMA /* * 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). */ extern struct page * FASTCALL(_alloc_pages(unsigned int gfp_mask, unsigned int order)); extern struct page * FASTCALL(__alloc_pages(unsigned int gfp_mask, unsigned int order, zonelist_t *zonelist)); extern struct page * alloc_pages_node(int nid, unsigned int gfp_mask, unsigned int order); static inline struct page * alloc_pages(unsigned int gfp_mask, unsigned int order) { /* * Gets optimized away by the compiler. */ if (order >= MAX_ORDER) return NULL; return _alloc_pages(gfp_mask, order); } #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) extern unsigned long FASTCALL(__get_free_pages(unsigned int gfp_mask, unsigned int order)); extern unsigned long FASTCALL(get_zeroed_page(unsigned int 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)) /* * The old interface name will be removed in 2.5: */ #define get_free_page get_zeroed_page /* * There is only one 'core' page-freeing function. */ extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); #define __free_page(page) __free_pages((page), 0) #define free_page(addr) free_pages((addr),0) #endif /* __LINUX_GFP_H */ |