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

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Message-Id: <20070508201542.3f4ebd5e.randy.dunlap@oracle.com>
Date:	Tue, 8 May 2007 20:15:42 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Rientjes <rientjes@...gle.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 19:38:56 -0700 (PDT) David Rientjes wrote:

> On Tue, 8 May 2007, Randy Dunlap wrote:
> 
> > "volatile" used on a gcc asm extension is different, granted.
> > It's not even a C-language "volatile" keyword AFAICT, so it doesn't
> > apply in this context.
> > 
> 
> Using 'volatile' for an asm construct certainly is a keyword; in fact, C99 
> defines 'volatile' as a token which is reserved for use as a keyword.

touche'

> > Anyway, how is this slightly modified title?
> > 
> > +***** "volatile" considered useless and evil:  Just Say NO! *****
> > +
> > +Do not use the C-language "volatile" keyword on kernel data
> > +(extracted from lkml emails from Linus)
> > 
> 
> It's still ambiguous.  A much more explicit title that nobody could argue 
> with would be "do not use the 'volatile' keyword as a type qualifier for 
> an object."

OK, I can accept that.

---
~Randy
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