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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2013-07-27 22:15:01 +0000
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2013-07-27 22:15:01 +0000
commit7996a3d79d55b7f879dfd62e202bbfe2963718d3 (patch)
tree8d9f6759fec4099b9be503c11c7ed174f7204980 /libdde-linux26/contrib/include/linux/gfp.h
parent4fbe7358c7747a9165f776eb19addbb9baf7def2 (diff)
really properly move files
Diffstat (limited to 'libdde-linux26/contrib/include/linux/gfp.h')
-rw-r--r--libdde-linux26/contrib/include/linux/gfp.h247
1 files changed, 247 insertions, 0 deletions
diff --git a/libdde-linux26/contrib/include/linux/gfp.h b/libdde-linux26/contrib/include/linux/gfp.h
new file mode 100644
index 00000000..dd20cd78
--- /dev/null
+++ b/libdde-linux26/contrib/include/linux/gfp.h
@@ -0,0 +1,247 @@
+#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.
+ *
+ * __GFP_MOVABLE: Flag that this page will be movable by the page migration
+ * mechanism or reclaimed
+ */
+#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) /* See above */
+#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
+#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
+#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_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
+#define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
+
+#define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */
+#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
+
+/* 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_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
+ __GFP_RECLAIMABLE)
+#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
+#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
+ __GFP_HIGHMEM)
+#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
+ __GFP_HARDWALL | __GFP_HIGHMEM | \
+ __GFP_MOVABLE)
+
+#ifdef CONFIG_NUMA
+#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
+#else
+#define GFP_THISNODE ((__force gfp_t)0)
+#endif
+
+/* This mask makes up all the page movable related flags */
+#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
+
+/* Control page allocator reclaim behavior */
+#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
+ __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
+ __GFP_NORETRY|__GFP_NOMEMALLOC)
+
+/* Control allocation constraints */
+#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
+
+/* Do not use these with a slab allocator */
+#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
+
+/* 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
+
+/* Convert GFP flags to their corresponding migrate type */
+static inline int allocflags_to_migratetype(gfp_t gfp_flags)
+{
+ WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
+
+ if (unlikely(page_group_by_mobility_disabled))
+ return MIGRATE_UNMOVABLE;
+
+ /* Group based on mobility */
+ return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
+ ((gfp_flags & __GFP_RECLAIMABLE) != 0);
+}
+
+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
+ if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
+ (__GFP_HIGHMEM | __GFP_MOVABLE))
+ return ZONE_MOVABLE;
+#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).
+ */
+
+static inline int gfp_zonelist(gfp_t flags)
+{
+ if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
+ return 1;
+
+ return 0;
+}
+
+/*
+ * 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.
+ * There are two zonelists per node, one for all zones with memory and
+ * one containing just zones from the node the zonelist belongs to.
+ *
+ * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
+ * optimized to &contig_page_data at compile-time.
+ */
+static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
+{
+ return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
+}
+
+#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
+
+struct page *
+__alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
+ struct zonelist *zonelist, nodemask_t *nodemask);
+
+static inline struct page *
+__alloc_pages(gfp_t gfp_mask, unsigned int order,
+ struct zonelist *zonelist)
+{
+ return __alloc_pages_internal(gfp_mask, order, zonelist, NULL);
+}
+
+static inline struct page *
+__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
+ struct zonelist *zonelist, nodemask_t *nodemask)
+{
+ return __alloc_pages_internal(gfp_mask, order, zonelist, nodemask);
+}
+
+
+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_zonelist(nid, 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 __get_free_pages(gfp_t gfp_mask, unsigned int order);
+extern unsigned long get_zeroed_page(gfp_t gfp_mask);
+
+void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
+void free_pages_exact(void *virt, size_t size);
+
+#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 __free_pages(struct page *page, unsigned int order);
+extern void free_pages(unsigned long addr, unsigned int order);
+extern void free_hot_page(struct page *page);
+extern void 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);
+void drain_all_pages(void);
+void drain_local_pages(void *dummy);
+
+#endif /* __LINUX_GFP_H */
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