From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 5 Dec 2016 17:25:42 +0000 (-0500)
Subject: ARM32: use dmb ish (inner shareable domain) for smp barriers
X-Git-Tag: v0.10.0~13
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=7fe7e9f353c3596b78b6bed1f4267037de750a48;hp=7fe7e9f353c3596b78b6bed1f4267037de750a48;p=urcu.git

ARM32: use dmb ish (inner shareable domain) for smp barriers

Based on https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01272.html:

From: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>:

"Hans Boehm pointed out that we were using dmb sy instead of dmb ish.
Given that the ARM-ARM says that the inner shareability domain is really
the one that contains all PE's controlled by a single hypervisor or
operating system, it would be safe to replace all dmb sy's with dmb
ish's. "

Keep full system barriers for cmm_mb()/cmm_rmb()/cmm_wmb().

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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