linux-kernel - Re: [PATCH] printk: drop logbuf

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Message-ID: <54665C24.9060605@linaro.org>
Date:	Fri, 14 Nov 2014 13:46:44 -0600
From:	Alex Elder <elder@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	akpm@...ux-foundation.org, bobby.prani@...il.com, pmladek@...e.cz,
	jack@...e.cz, mcgrof@...e.com, joe@...ches.com,
	linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>
Subject: Re: [PATCH] printk: drop logbuf_cpu volatile qualifier

On 11/14/2014 01:45 PM, Steven Rostedt wrote:
> On Fri, 14 Nov 2014 13:19:31 -0600
> Alex Elder <elder@...aro.org> wrote:
> 
>> Pranith Kumar posted a patch in which removed the "volatile"
>> qualifier for the "logbuf_cpu" variable in vprintk_emit().
>>     https://lkml.org/lkml/2014/11/13/894
>> In his patch, he used ACCESS_ONCE() for all references to
>> that symbol to provide whatever protection was intended.
>>
>> There was some discussion that followed, and in the end
>> Stephen Rostedt concluded that not only was "volatile" not
> 
> I don't know of a Stephen Rostedt. J

Sorry.  I'm sure that's a source of annoyance.  -Alex

>> needed, neither was it required to use ACCESS_ONCE().  I
>> offered an elaborate description that concluded Stephen
> 
> Who is this Stephen you talk about?

. . .

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