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Subject[RFC PATCH 2/6] slub: add kmalloc_align()
Date
ALIGN_OF_LAST_BIT(size) is used instead of
ARCH_KMALLOC_MINALIGN when kmalloc kmem_caches are created.

No behavior changed except debug.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
include/linux/slub_def.h | 6 ++++++
mm/slub.c | 2 +-
2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a32bcfd..67ac6b4 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -280,6 +280,12 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
return __kmalloc(size, flags);
}

+static __always_inline
+void *kmalloc_align(size_t size, gfp_t flags, size_t align)
+{
+ return kmalloc(ALIGN(size, align), flags);
+}
+
#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
diff --git a/mm/slub.c b/mm/slub.c
index 4907563..01cf99d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3238,7 +3238,7 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
* This function is called with IRQs disabled during early-boot on
* single CPU so there's no need to take slub_lock here.
*/
- if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
+ if (!kmem_cache_open(s, name, size, ALIGN_OF_LAST_BIT(size),
flags, NULL))
goto panic;

--
1.7.4.4


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