From: Will Deacon <will.deacon@arm.com>
Date: Tue, 14 May 2013 09:08:07 +0000 (+0100)
Subject: ARM: mcpm: use -st dsb option prior to sev instructions
X-Git-Tag: v3.12-rc1~128^2^3~1^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=40a5c0b415f080638a744177653aac4527002bbf;p=pandora-kernel.git

ARM: mcpm: use -st dsb option prior to sev instructions

In a similar manner to our spinlock implementation, mcpm uses sev to
wake up cores waiting on a lock when the lock is unlocked. In order to
ensure that the final write unlocking the lock is visible, a dsb
instruction is executed immediately prior to the sev.

This patch changes these dsbs to use the -st option, since we only
require that the store unlocking the lock is made visible.

Acked-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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