1 files changed, 100 insertions, 0 deletions

diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
new file mode 100644
index 000000000000..4b463e66ddea
--- /dev/null
+++ b/include/linux/slab_def.h
@@ -0,0 +1,100 @@
+#ifndef _LINUX_SLAB_DEF_H
+#define _LINUX_SLAB_DEF_H
+
+/*
+ * Definitions unique to the original Linux SLAB allocator.
+ *
+ * What we provide here is a way to optimize the frequent kmalloc
+ * calls in the kernel by selecting the appropriate general cache
+ * if kmalloc was called with a size that can be established at
+ * compile time.
+ */
+
+#include <linux/init.h>
+#include <asm/page.h>           /* kmalloc_sizes.h needs PAGE_SIZE */
+#include <asm/cache.h>          /* kmalloc_sizes.h needs L1_CACHE_BYTES */
+#include <linux/compiler.h>
+
+/* Size description struct for general caches. */
+struct cache_sizes {
+        size_t                  cs_size;
+        struct kmem_cache       *cs_cachep;
+        struct kmem_cache       *cs_dmacachep;
+};
+extern struct cache_sizes malloc_sizes[];
+
+static inline void *kmalloc(size_t size, gfp_t flags)
+{
+        if (__builtin_constant_p(size)) {
+                int i = 0;
+#define CACHE(x) \
+                if (size <= x) \
+                        goto found; \
+                else \
+                        i++;
+#include "kmalloc_sizes.h"
+#undef CACHE
+                {
+                        extern void __you_cannot_kmalloc_that_much(void);
+                        __you_cannot_kmalloc_that_much();
+                }
+found:
+                return kmem_cache_alloc((flags & GFP_DMA) ?
+                        malloc_sizes[i].cs_dmacachep :
+                        malloc_sizes[i].cs_cachep, flags);
+        }
+        return __kmalloc(size, flags);
+}
+
+static inline void *kzalloc(size_t size, gfp_t flags)
+{
+        if (__builtin_constant_p(size)) {
+                int i = 0;
+#define CACHE(x) \
+                if (size <= x) \
+                        goto found; \
+                else \
+                        i++;
+#include "kmalloc_sizes.h"
+#undef CACHE
+                {
+                        extern void __you_cannot_kzalloc_that_much(void);
+                        __you_cannot_kzalloc_that_much();
+                }
+found:
+                return kmem_cache_zalloc((flags & GFP_DMA) ?
+                        malloc_sizes[i].cs_dmacachep :
+                        malloc_sizes[i].cs_cachep, flags);
+        }
+        return __kzalloc(size, flags);
+}
+
+#ifdef CONFIG_NUMA
+extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
+
+static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+{
+        if (__builtin_constant_p(size)) {
+                int i = 0;
+#define CACHE(x) \
+                if (size <= x) \
+                        goto found; \
+                else \
+                        i++;
+#include "kmalloc_sizes.h"
+#undef CACHE
+                {
+                        extern void __you_cannot_kmalloc_that_much(void);
+                        __you_cannot_kmalloc_that_much();
+                }
+found:
+                return kmem_cache_alloc_node((flags & GFP_DMA) ?
+                        malloc_sizes[i].cs_dmacachep :
+                        malloc_sizes[i].cs_cachep, flags, node);
+        }
+        return __kmalloc_node(size, flags, node);
+}
+
+#endif  /* CONFIG_NUMA */
+
+#endif  /* _LINUX_SLAB_DEF_H */