linux-kernel - Re: [PATCH v4 1/3] clocksource: timer-keystone: introduce clocksource driver for Keystone

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Message-ID: <alpine.DEB.2.02.1402042113270.24986@ionos.tec.linutronix.de>
Date:	Tue, 4 Feb 2014 21:17:28 +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 v4 1/3] clocksource: timer-keystone: introduce clocksource
 driver for Keystone

On Tue, 4 Feb 2014, Ivan Khoronzhuk wrote:

Please do not top post.

> It was so in v1. But it was decided to use explicit memory barriers,
> because we're always sure the memory barriers are there and that
> they're properly documented. Also in this case I don't need to add
> keystone readl/writel relaxed function variants and to use mixed calls of
> writel/writel_relaxed functions.
> 
> See:
> http://www.spinics.net/lists/arm-kernel/msg294941.html

Fair enough, but we want a proper explanation for explicit barriers in
the code and not in some random discussion of patch version X on some
random mailing list.

Aside of that it should be iowmb(), but I might miss something ...

Thanks,

	tglx

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