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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.02.1402052123560.24986@ionos.tec.linutronix.de>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/