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

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Message-ID: <alpine.DEB.0.99.0705081217180.12908@chino.kir.corp.google.com>
Date:	Tue, 8 May 2007 12:18:33 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Sokolovsky <pmiscml@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH] doc: volatile considered evil

On Tue, 8 May 2007, Randy Dunlap wrote:

> [well, can be turned into a patch]
> 
> Here are some 'volatile' comments from Linus, extracted from
> several emails in at least 2 threads.
> 
> If this is close to useful, we can add it to Documentation/.
> 
> ===============================================================
> 
> ***** "volatile" considered useless and evil:  Just Say NO! *****
> 
> Do not use the C-language "volatile" keyword
> (extracted from lkml emails from Linus)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 

Since 'volatile' has two different semantics depending on the context in 
which it is used, this warning should be appended to include the fact that 
it is legitimate to use for inline assembly.
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