linux-kernel - Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier call

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Message-ID: <570497C7.10501@wwwdotorg.org>
Date:	Tue, 5 Apr 2016 22:59:51 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Eric Anholt <eric@...olt.net>
Cc:	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Lee Jones <lee@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH 4/4] irqchip: bcm2836: Use a more generic memory barrier
 call

On 04/04/2016 09:44 PM, Eric Anholt wrote:
> dsb() requires an argument on arm64, so we needed to add "sy".
> Instead, take this opportunity to switch to the same smp_wmb() call
> that gic uses for its IPIs.  This is a less strong barrier than we
> were doing before (dmb(ishst) compared to dsb(sy)), but it seems to be
> the correct one.

I assume all MMIO is part of the ish domain?

If so, the series,
Acked-by: Stephen Warren <swarren@...dotorg.org>