From: NeilBrown <neilb@suse.de>
Date: Fri, 8 Aug 2014 21:19:54 +0000 (-0700)
Subject: autofs4: don't take spinlock when not needed in autofs4_lookup_expiring
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~116^2~175
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=668128e90b9596668141539326178dacc42af188;p=pandora-kernel.git

autofs4: don't take spinlock when not needed in autofs4_lookup_expiring

If the expiring_list is empty, we can avoid a costly spinlock in the
rcu-walk path through autofs4_d_manage (once the rest of the path
becomes rcu-walk friendly).

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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