From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 28 May 2008 00:18:17 +0000 (+1000)
Subject: [POWERPC] Add "memory" clobber to MMIO accessors
X-Git-Tag: v2.6.26-rc5~27^2~2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfab3bdf8292edec19492c89520b1ad11279a648;p=pandora-kernel.git

[POWERPC] Add "memory" clobber to MMIO accessors

Gcc might re-order MMIO accessors vs. surrounding consistent
memory accesses, which is a "bad thing", and could break drivers.
This fixes it by adding a "memory" clobber to the MMIO accessors,
which should prevent gcc from doing that reordering.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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