1 files changed, 134 insertions, 0 deletions

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
new file mode 100644
index 000000000000..848a1baac079
--- /dev/null
+++ b/include/linux/gfp.h
@@ -0,0 +1,134 @@
+#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 two bits) */
+#define __GFP_DMA       0x01
+#define __GFP_HIGHMEM   0x02
+
+/*
+ * 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      0x10u   /* Can wait and reschedule? */
+#define __GFP_HIGH      0x20u   /* Should access emergency pools? */
+#define __GFP_IO        0x40u   /* Can start physical IO? */
+#define __GFP_FS        0x80u   /* Can call down to low-level FS? */
+#define __GFP_COLD      0x100u  /* Cache-cold page required */
+#define __GFP_NOWARN    0x200u  /* Suppress page allocation failure warning */
+#define __GFP_REPEAT    0x400u  /* Retry the allocation.  Might fail */
+#define __GFP_NOFAIL    0x800u  /* Retry for ever.  Cannot fail */
+#define __GFP_NORETRY   0x1000u /* Do not retry.  Might fail */
+#define __GFP_NO_GROW   0x2000u /* Slab internal usage */
+#define __GFP_COMP      0x4000u /* Add compound page metadata */
+#define __GFP_ZERO      0x8000u /* Return zeroed page on success */
+
+#define __GFP_BITS_SHIFT 16     /* Room for 16 __GFP_FOO bits */
+#define __GFP_BITS_MASK ((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)
+
+#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)
+#define GFP_HIGHUSER    (__GFP_WAIT | __GFP_IO | __GFP_FS | __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
+
+
+/*
+ * 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(unsigned int, unsigned int, struct zonelist *));
+
+static inline struct page *alloc_pages_node(int nid, unsigned int __nocast gfp_mask,
+                                                unsigned int order)
+{
+        if (unlikely(order >= MAX_ORDER))
+                return NULL;
+
+        return __alloc_pages(gfp_mask, order,
+                NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
+}
+
+#ifdef CONFIG_NUMA
+extern struct page *alloc_pages_current(unsigned int __nocast gfp_mask, unsigned order);
+
+static inline struct page *
+alloc_pages(unsigned int __nocast 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(unsigned __nocast 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(unsigned int __nocast gfp_mask, unsigned int order));
+extern unsigned long FASTCALL(get_zeroed_page(unsigned int __nocast 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);
+
+#endif /* __LINUX_GFP_H */