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authorAndrzej Hajda <a.hajda@samsung.com>2015-02-14 01:36:41 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-14 08:21:36 +0300
commitfcc139ae227b97bd81352e9102d8e79498d1e930 (patch)
treeba99b24ed6f6a39193e12dc35e10406b0332c6f3
parent3dec16ea38afce38ceb49c8938901318797a08c4 (diff)
downloadlinux-fcc139ae227b97bd81352e9102d8e79498d1e930.tar.xz
fs/namespace: convert devname allocation to kstrdup_const
VFS 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> Cc: 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/namespace.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index cd1e9681a0cf..6dae553dd69c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -201,7 +201,7 @@ static struct mount *alloc_vfsmnt(const char *name)
goto out_free_cache;
if (name) {
- mnt->mnt_devname = kstrdup(name, GFP_KERNEL);
+ mnt->mnt_devname = kstrdup_const(name, GFP_KERNEL);
if (!mnt->mnt_devname)
goto out_free_id;
}
@@ -234,7 +234,7 @@ static struct mount *alloc_vfsmnt(const char *name)
#ifdef CONFIG_SMP
out_free_devname:
- kfree(mnt->mnt_devname);
+ kfree_const(mnt->mnt_devname);
#endif
out_free_id:
mnt_free_id(mnt);
@@ -568,7 +568,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
static void free_vfsmnt(struct mount *mnt)
{
- kfree(mnt->mnt_devname);
+ kfree_const(mnt->mnt_devname);
#ifdef CONFIG_SMP
free_percpu(mnt->mnt_pcp);
#endif