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authorAndrzej Hajda <a.hajda@samsung.com>2015-02-13 14:36:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 21:21:35 -0800
commit75287a677ba1beab7ca0db948468f44eb23a709f (patch)
tree94ce4c696199aac8372d9e6e5a5162bad64fc54c
parenta4bb1e43e22d3cade8f942fc6f95920248eb2fd0 (diff)
kernfs: convert node name allocation to kstrdup_const
sysfs 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> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Mike Turquette <mturquette@linaro.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Tejun Heo <tj@kernel.org> Cc: Greg KH <greg@kroah.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/kernfs/dir.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 2d881b381d2b..35e40879860a 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -412,7 +412,7 @@ void kernfs_put(struct kernfs_node *kn)
if (kernfs_type(kn) == KERNFS_LINK)
kernfs_put(kn->symlink.target_kn);
if (!(kn->flags & KERNFS_STATIC_NAME))
- kfree(kn->name);
+ kfree_const(kn->name);
if (kn->iattr) {
if (kn->iattr->ia_secdata)
security_release_secctx(kn->iattr->ia_secdata,
@@ -506,12 +506,12 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
const char *name, umode_t mode,
unsigned flags)
{
- char *dup_name = NULL;
+ const char *dup_name = NULL;
struct kernfs_node *kn;
int ret;
if (!(flags & KERNFS_STATIC_NAME)) {
- name = dup_name = kstrdup(name, GFP_KERNEL);
+ name = dup_name = kstrdup_const(name, GFP_KERNEL);
if (!name)
return NULL;
}
@@ -538,7 +538,7 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
err_out2:
kmem_cache_free(kernfs_node_cache, kn);
err_out1:
- kfree(dup_name);
+ kfree_const(dup_name);
return NULL;
}
@@ -1264,7 +1264,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
/* rename kernfs_node */
if (strcmp(kn->name, new_name) != 0) {
error = -ENOMEM;
- new_name = kstrdup(new_name, GFP_KERNEL);
+ new_name = kstrdup_const(new_name, GFP_KERNEL);
if (!new_name)
goto out;
} else {
@@ -1297,7 +1297,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
kernfs_link_sibling(kn);
kernfs_put(old_parent);
- kfree(old_name);
+ kfree_const(old_name);
error = 0;
out: