[PATCH 4/5] mm/slab: convert cache name allocations to kstrdup_const

Andrzej Hajda
2015-01-12T09:20:18Z

slab frequently performs duplication of strings located
in read-only memory section. Replacing kstrdup by kstrdup_const
allows to avoid such operations.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
---
mm/slab_common.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index e03dd6f..2d94d1a 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -390,7 +390,7 @@ kmem_cache_create(const char *name, size_t size, size_t align,
if (s)
goto out_unlock;

- cache_name = kstrdup(name, GFP_KERNEL);
+ cache_name = kstrdup_const(name, GFP_KERNEL);
if (!cache_name) {
err = -ENOMEM;
goto out_unlock;
@@ -401,7 +401,7 @@ kmem_cache_create(const char *name, size_t size, size_t align,
flags, ctor, NULL, NULL);
if (IS_ERR(s)) {
err = PTR_ERR(s);
- kfree(cache_name);
+ kfree_const(cache_name);
}

out_unlock:
@@ -494,7 +494,7 @@ static int memcg_cleanup_cache_params(struct kmem_cache *s)

void slab_kmem_cache_release(struct kmem_cache *s)
{
- kfree(s->name);
+ kfree_const(s->name);
kmem_cache_free(kmem_cache, s);
}

--
1.9.1