diff options
Diffstat (limited to 'mm/slab_common.c')
| -rw-r--r-- | mm/slab_common.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c index f684b06649c3..315e83f5daea 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -758,6 +758,26 @@ 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 @@ -1285,20 +1305,6 @@ void kfree_sensitive(const void *p) } EXPORT_SYMBOL(kfree_sensitive); -/** - * ksize - get the actual amount of memory allocated for a given object - * @objp: Pointer to the object - * - * kmalloc may internally round up allocations and return more memory - * than requested. ksize() can be used to determine the actual amount of - * memory allocated. The caller may use this additional memory, even though - * a smaller amount of memory was initially specified with the kmalloc call. - * The caller must guarantee that objp points to a valid object previously - * allocated with either kmalloc() or kmem_cache_alloc(). The object - * must not be freed during the duration of the call. - * - * Return: size of the actual memory used by @objp in bytes - */ size_t ksize(const void *objp) { size_t size; |