tree 1311e860f1c86371852175c582d111ce565d411d
parent d8e89b47e00ee80e920761145144640aac4cf71a
author Will Deacon <will.deacon@arm.com> 1316784852 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1317037007 +0100

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>