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>
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@ -201,7 +201,7 @@ static struct mount *alloc_vfsmnt(const char *name)
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goto out_free_cache;
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if (name) {
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mnt->mnt_devname = kstrdup(name, GFP_KERNEL);
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mnt->mnt_devname = kstrdup_const(name, GFP_KERNEL);
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if (!mnt->mnt_devname)
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goto out_free_id;
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}
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@ -234,7 +234,7 @@ static struct mount *alloc_vfsmnt(const char *name)
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#ifdef CONFIG_SMP
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out_free_devname:
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kfree(mnt->mnt_devname);
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kfree_const(mnt->mnt_devname);
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#endif
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out_free_id:
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mnt_free_id(mnt);
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@ -568,7 +568,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
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static void free_vfsmnt(struct mount *mnt)
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{
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kfree(mnt->mnt_devname);
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kfree_const(mnt->mnt_devname);
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#ifdef CONFIG_SMP
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free_percpu(mnt->mnt_pcp);
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#endif
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