[RFC PATCH 2/6] slub: add kmalloc_align()

[Lai Jiangshan]

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@xxxxxxxxxxxxxx>
---
 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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