diff options
Diffstat (limited to 'mm/slab_common.c')
| -rw-r--r-- | mm/slab_common.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index 023dc0451d16..78c0dcb0221b 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -737,6 +737,26 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags) return kmalloc_caches[kmalloc_type(flags)][index]; } +size_t kmalloc_size_roundup(size_t size) +{ + struct kmem_cache *c; + + /* Short-circuit the 0 size case. */ + if (unlikely(size == 0)) + return 0; + /* Short-circuit saturated "too-large" case. */ + if (unlikely(size == SIZE_MAX)) + return SIZE_MAX; + /* Above the smaller buckets, size is a multiple of page size. */ + if (size > KMALLOC_MAX_CACHE_SIZE) + return PAGE_SIZE << get_order(size); + + /* The flags don't matter since size_index is common to all. */ + c = kmalloc_slab(size, GFP_KERNEL); + return c ? c->object_size : 0; +} +EXPORT_SYMBOL(kmalloc_size_roundup); + #ifdef CONFIG_ZONE_DMA #define KMALLOC_DMA_NAME(sz) .name[KMALLOC_DMA] = "dma-kmalloc-" #sz, #else |