diff options
Diffstat (limited to 'include/linux/slub_def.h')
-rw-r--r-- | include/linux/slub_def.h | 57 |
1 files changed, 24 insertions, 33 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 7496207..3b361b2 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -72,7 +72,7 @@ struct kmem_cache { * We keep the general caches in an array of slab caches that are used for * 2^x bytes of allocations. */ -extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; +extern struct kmem_cache kmalloc_caches[PAGE_SHIFT]; /* * Sorry that the following has to be that ugly but some versions of GCC @@ -83,9 +83,6 @@ static __always_inline int kmalloc_index(size_t size) if (!size) return 0; - if (size > KMALLOC_MAX_SIZE) - return -1; - if (size <= KMALLOC_MIN_SIZE) return KMALLOC_SHIFT_LOW; @@ -102,6 +99,10 @@ static __always_inline int kmalloc_index(size_t size) if (size <= 512) return 9; if (size <= 1024) return 10; if (size <= 2 * 1024) return 11; +/* + * The following is only needed to support architectures with a larger page + * size than 4k. + */ if (size <= 4 * 1024) return 12; if (size <= 8 * 1024) return 13; if (size <= 16 * 1024) return 14; @@ -109,13 +110,9 @@ static __always_inline int kmalloc_index(size_t size) if (size <= 64 * 1024) return 16; if (size <= 128 * 1024) return 17; if (size <= 256 * 1024) return 18; - if (size <= 512 * 1024) return 19; + if (size <= 512 * 1024) return 19; if (size <= 1024 * 1024) return 20; if (size <= 2 * 1024 * 1024) return 21; - if (size <= 4 * 1024 * 1024) return 22; - if (size <= 8 * 1024 * 1024) return 23; - if (size <= 16 * 1024 * 1024) return 24; - if (size <= 32 * 1024 * 1024) return 25; return -1; /* @@ -140,19 +137,6 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size) if (index == 0) return NULL; - /* - * This function only gets expanded if __builtin_constant_p(size), so - * testing it here shouldn't be needed. But some versions of gcc need - * help. - */ - if (__builtin_constant_p(size) && index < 0) { - /* - * Generate a link failure. Would be great if we could - * do something to stop the compile here. - */ - extern void __kmalloc_size_too_large(void); - __kmalloc_size_too_large(); - } return &kmalloc_caches[index]; } @@ -168,15 +152,21 @@ void *__kmalloc(size_t size, gfp_t flags); static __always_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 (__builtin_constant_p(size)) { + if (size > PAGE_SIZE / 2) + return (void *)__get_free_pages(flags | __GFP_COMP, + get_order(size)); - if (!s) - return ZERO_SIZE_PTR; + if (!(flags & SLUB_DMA)) { + struct kmem_cache *s = kmalloc_slab(size); + + if (!s) + return ZERO_SIZE_PTR; - return kmem_cache_alloc(s, flags); - } else - return __kmalloc(size, flags); + return kmem_cache_alloc(s, flags); + } + } + return __kmalloc(size, flags); } #ifdef CONFIG_NUMA @@ -185,15 +175,16 @@ void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) { - if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) { - struct kmem_cache *s = kmalloc_slab(size); + if (__builtin_constant_p(size) && + size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) { + struct kmem_cache *s = kmalloc_slab(size); if (!s) return ZERO_SIZE_PTR; return kmem_cache_alloc_node(s, flags, node); - } else - return __kmalloc_node(size, flags, node); + } + return __kmalloc_node(size, flags, node); } #endif |