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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>
wifi-calibration
Andrzej Hajda 2015-02-13 14:36:41 -08:00 committed by Linus Torvalds
parent 3dec16ea38
commit fcc139ae22
1 changed files with 3 additions and 3 deletions
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6
fs/namespace.c
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@ -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