1 files changed, 25 insertions, 24 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 0764c829d967..124270df8734 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -16,7 +16,9 @@ struct kmem_cache_node {
 	unsigned long nr_partial;
 	atomic_long_t nr_slabs;
 	struct list_head partial;
+#ifdef CONFIG_SLUB_DEBUG
 	struct list_head full;
+#endif
 };
 
 /*
@@ -28,7 +30,7 @@ struct kmem_cache {
 	int size;		/* The size of an object including meta data */
 	int objsize;		/* The size of an object without meta data */
 	int offset;		/* Free pointer offset. */
-	unsigned int order;
+	int order;
 
 	/*
 	 * Avoid an extra cache line for UP, SMP and for the node local to
@@ -44,7 +46,9 @@ struct kmem_cache {
 	int align;		/* Alignment */
 	const char *name;	/* Name (only for display!) */
 	struct list_head list;	/* List of slab caches */
+#ifdef CONFIG_SLUB_DEBUG
 	struct kobject kobj;	/* For sysfs */
+#endif
 
 #ifdef CONFIG_NUMA
 	int defrag_ratio;
@@ -56,7 +60,13 @@ struct kmem_cache {
 /*
  * Kmalloc subsystem.
  */
-#define KMALLOC_SHIFT_LOW 3
+#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
+#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
+#else
+#define KMALLOC_MIN_SIZE 8
+#endif
+
+#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
 
 /*
  * We keep the general caches in an array of slab caches that are used for
@@ -70,15 +80,15 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
  */
 static inline int kmalloc_index(size_t size)
 {
-	/*
-	 * We should return 0 if size == 0 but we use the smallest object
-	 * here for SLAB legacy reasons.
-	 */
-	WARN_ON_ONCE(size == 0);
+	if (!size)
+		return 0;
 
 	if (size > KMALLOC_MAX_SIZE)
 		return -1;
 
+	if (size <= KMALLOC_MIN_SIZE)
+		return KMALLOC_SHIFT_LOW;
+
 	if (size > 64 && size <= 96)
 		return 1;
 	if (size > 128 && size <= 192)
@@ -150,37 +160,28 @@ static inline struct kmem_cache *kmalloc_slab(size_t size)
 #define SLUB_DMA __GFP_DMA
 #else
 /* Disable DMA functionality */
-#define SLUB_DMA 0
+#define SLUB_DMA (__force gfp_t)0
 #endif
 
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
+void *__kmalloc(size_t size, gfp_t flags);
+
 static inline void *kmalloc(size_t size, gfp_t flags)
 {
 	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
 		struct kmem_cache *s = kmalloc_slab(size);
 
 		if (!s)
-			return NULL;
+			return ZERO_SIZE_PTR;
 
 		return kmem_cache_alloc(s, flags);
 	} else
 		return __kmalloc(size, flags);
 }
 
-static inline void *kzalloc(size_t size, gfp_t flags)
-{
-	if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
-		struct kmem_cache *s = kmalloc_slab(size);
-
-		if (!s)
-			return NULL;
-
-		return kmem_cache_zalloc(s, flags);
-	} else
-		return __kzalloc(size, flags);
-}
-
 #ifdef CONFIG_NUMA
-extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
+void *__kmalloc_node(size_t size, gfp_t flags, int node);
+void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
 
 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
@@ -188,7 +189,7 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 		struct kmem_cache *s = kmalloc_slab(size);
 
 		if (!s)
-			return NULL;
+			return ZERO_SIZE_PTR;
 
 		return kmem_cache_alloc_node(s, flags, node);
 	} else