linux-kernel - Re: [PATCH] doc: volatile considered evil

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Message-ID: <alpine.DEB.0.99.0705081702070.28511@chino.kir.corp.google.com>
Date:	Tue, 8 May 2007 17:06:23 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
cc:	Satyam Sharma <satyam.sharma@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Sokolovsky <pmiscml@...il.com>,
	linux-kernel@...r.kernel.org, jeremy@...p.org
Subject: Re: [PATCH] doc: volatile considered evil

On Tue, 8 May 2007, Randy Dunlap wrote:

> From: Randy Dunlap <randy.dunlap@...cle.com>
> 
> Add information on the problems with the C-language "volatile" keyword
> and why it should not be used (most of the time).
> 
> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> ---
>  Documentation/volatile-usage.txt |  129 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 129 insertions(+)
> 
> --- /dev/null
> +++ linux-2.6.21-git10/Documentation/volatile-usage.txt
> @@ -0,0 +1,129 @@
> +***** "volatile" considered useless and evil:  Just Say NO! *****
> +
> +Do not use the C-language "volatile" keyword
> +(extracted from lkml emails from Linus)
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +

Again, please change this sweeping introduction to explicitly state that 
Linus' emails were a criticism of using 'volatile' for objects (he refers 
to them as "data structures") and can be appropriate for asm constructs.
-
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