From: Will Deacon <will.deacon@arm.com>
Date: Fri, 23 Sep 2011 13:34:12 +0000 (+0100)
Subject: ARM: 7099/1: futex: preserve oldval in SMP __futex_atomic_op
X-Git-Tag: v3.1-rc8~9^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df77abcafc8dc881b6c9347548651777088e4b27;p=pandora-kernel.git

ARM: 7099/1: futex: preserve oldval in SMP __futex_atomic_op

The SMP implementation of __futex_atomic_op clobbers oldval with the
status flag from the exclusive store. This causes it to always read as
zero when performing the FUTEX_OP_CMP_* operation.

This patch updates the ARM __futex_atomic_op implementations to take a
tmp argument, allowing us to store the strex status flag without
overwriting the register containing oldval.

Cc: stable@kernel.org
Reported-by: Minho Ban <mhban@samsung.com>
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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