From: Will Deacon <will.deacon@arm.com>
Date: Fri, 10 May 2013 17:07:19 +0000 (+0100)
Subject: ARM: barrier: allow options to be passed to memory barrier instructions
X-Git-Tag: v3.12-rc1~128^2^3~1^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ea128065ed20d33bd02ff6dab689f88e38000be;p=pandora-kernel.git

ARM: barrier: allow options to be passed to memory barrier instructions

On ARMv7, the memory barrier instructions take an optional `option'
field which can be used to constrain the effects of a memory barrier
based on shareability and access type.

This patch allows the caller to pass these options if required, and
updates the smp_*() barriers to request inner-shareable barriers,
affecting only stores for the _wmb variant. wmb() is also changed to
use the -st version of dsb.

Reported-by: Albin Tonnerre <albin.tonnerre@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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