From: Chris Metcalf <cmetcalf@tilera.com>
Date: Fri, 30 Mar 2012 19:46:29 +0000 (-0400)
Subject: arch/tile: use atomic exchange in arch_write_unlock()
X-Git-Tag: v3.4-rc2~7^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab306cae660e524edbeb8889e4e23d3c97717b9c;p=pandora-kernel.git

arch/tile: use atomic exchange in arch_write_unlock()

This idiom is used elsewhere when we do an unlock by writing a zero,
but I missed it here.  Using an atomic operation avoids waiting
on the write buffer for the unlocking write to be sent to the home cache.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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