[RFC PATCH 4/4] mm/slab: use kstrdup_const for allocating cache names

[Andrzej Hajda]

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@xxxxxxxxxxx>
---
 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

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