From: Michel Lespinasse <walken@google.com>
Date: Tue, 7 May 2013 13:45:57 +0000 (-0700)
Subject: rwsem: skip initial trylock in rwsem_down_write_failed
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~14^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b0fc9c09f1b;p=pandora-kernel.git

rwsem: skip initial trylock in rwsem_down_write_failed

We can skip the initial trylock in rwsem_down_write_failed() if there
are known active lockers already, thus saving one likely-to-fail
cmpxchg.

Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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