linux-kernel - Re: [PATCH v5 1/3] clocksource: timer-keystone: introduce clocksource driver for Keystone

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Date:	Wed, 5 Feb 2014 21:27:51 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ivan Khoronzhuk <ivan.khoronzhuk@...com>
cc:	santosh.shilimkar@...com, rob@...dley.net, linux@....linux.org.uk,
	galak@...eaurora.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	daniel.lezcano@...aro.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, grygorii.strashko@...com
Subject: Re: [PATCH v5 1/3] clocksource: timer-keystone: introduce clocksource
 driver for Keystone

On Wed, 5 Feb 2014, Ivan Khoronzhuk wrote:
> +	/* here we have to be sure the timer has been disabled */

Sigh. This is not a proper explanation for a barrier, really. You want
to explain what it serializes against what. i.e. you want to explain
why you are using the relaxed functions and avoid a separate non
relaxed variant in favour of an explicit barrier.

> +	__iowmb();

The proper thing is to have an inline function key_stone_barrier() and
a full explanation of the issue in exactly that place instead of
handwaving comments here and there.

Thanks,

	tglx
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