143 lines
4.8 KiB
C
143 lines
4.8 KiB
C
#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/mmzone.h>
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#include <linux/stddef.h>
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#include <linux/linkage.h>
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#include <linux/config.h>
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struct vm_area_struct;
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/*
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* GFP bitmasks..
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*/
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/* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
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#define __GFP_DMA 0x01u
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#define __GFP_HIGHMEM 0x02u
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/*
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* Action modifiers - doesn't change the zoning
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*
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* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
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* _might_ fail. This depends upon the particular VM implementation.
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*
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* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
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* cannot handle allocation failures.
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*
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* __GFP_NORETRY: The VM implementation must not retry indefinitely.
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*/
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#define __GFP_WAIT 0x10u /* Can wait and reschedule? */
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#define __GFP_HIGH 0x20u /* Should access emergency pools? */
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#define __GFP_IO 0x40u /* Can start physical IO? */
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#define __GFP_FS 0x80u /* Can call down to low-level FS? */
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#define __GFP_COLD 0x100u /* Cache-cold page required */
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#define __GFP_NOWARN 0x200u /* Suppress page allocation failure warning */
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#define __GFP_REPEAT 0x400u /* Retry the allocation. Might fail */
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#define __GFP_NOFAIL 0x800u /* Retry for ever. Cannot fail */
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#define __GFP_NORETRY 0x1000u /* Do not retry. Might fail */
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#define __GFP_NO_GROW 0x2000u /* Slab internal usage */
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#define __GFP_COMP 0x4000u /* Add compound page metadata */
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#define __GFP_ZERO 0x8000u /* Return zeroed page on success */
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#define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */
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#define __GFP_NORECLAIM 0x20000u /* No realy zone reclaim during allocation */
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#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
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#define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
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/* if you forget to add the bitmask here kernel will crash, period */
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#define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
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__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
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__GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
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__GFP_NOMEMALLOC|__GFP_NORECLAIM)
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#define GFP_ATOMIC (__GFP_HIGH)
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#define GFP_NOIO (__GFP_WAIT)
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#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
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#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
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#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS)
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#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM)
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/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
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platforms, used as appropriate on others */
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#define GFP_DMA __GFP_DMA
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/*
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* There is only one page-allocator function, and two main namespaces to
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* it. The alloc_page*() variants return 'struct page *' and as such
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* can allocate highmem pages, the *get*page*() variants return
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* virtual kernel addresses to the allocated page(s).
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*/
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/*
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* We get the zone list from the current node and the gfp_mask.
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* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
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*
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* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
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* optimized to &contig_page_data at compile-time.
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*/
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#ifndef HAVE_ARCH_FREE_PAGE
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static inline void arch_free_page(struct page *page, int order) { }
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#endif
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extern struct page *
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FASTCALL(__alloc_pages(unsigned int, unsigned int, struct zonelist *));
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static inline struct page *alloc_pages_node(int nid, unsigned int __nocast gfp_mask,
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unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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return __alloc_pages(gfp_mask, order,
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NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
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}
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#ifdef CONFIG_NUMA
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extern struct page *alloc_pages_current(unsigned int __nocast gfp_mask, unsigned order);
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static inline struct page *
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alloc_pages(unsigned int __nocast gfp_mask, unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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return alloc_pages_current(gfp_mask, order);
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}
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extern struct page *alloc_page_vma(unsigned __nocast gfp_mask,
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struct vm_area_struct *vma, unsigned long addr);
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#else
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#define alloc_pages(gfp_mask, order) \
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alloc_pages_node(numa_node_id(), gfp_mask, order)
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#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
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#endif
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#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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extern unsigned long FASTCALL(__get_free_pages(unsigned int __nocast gfp_mask, unsigned int order));
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extern unsigned long FASTCALL(get_zeroed_page(unsigned int __nocast gfp_mask));
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#define __get_free_page(gfp_mask) \
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__get_free_pages((gfp_mask),0)
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#define __get_dma_pages(gfp_mask, order) \
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__get_free_pages((gfp_mask) | GFP_DMA,(order))
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extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
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extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
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extern void FASTCALL(free_hot_page(struct page *page));
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extern void FASTCALL(free_cold_page(struct page *page));
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#define __free_page(page) __free_pages((page), 0)
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#define free_page(addr) free_pages((addr),0)
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void page_alloc_init(void);
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#ifdef CONFIG_NUMA
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void drain_remote_pages(void);
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#else
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static inline void drain_remote_pages(void) { };
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#endif
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#endif /* __LINUX_GFP_H */
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