linux-kernel - Re: [PATCH] "volatile considered harmful", take 3

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Message-ID: <46460223.5090909@zytor.com>
Date:	Sat, 12 May 2007 11:06:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	Satyam Sharma <satyam.sharma@...il.com>,
	Jonathan Corbet <corbet@....net>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Johannes Stezenbach <js@...uxtv.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Heikki Orsila <shdl@...alwe.fi>,
	jimmy bahuleyan <knight.camelot@...il.com>
Subject: Re: [PATCH] "volatile considered harmful", take 3

Stefan Richter wrote:
> H. Peter Anvin wrote:
> [slightly off topic: GCCisms in Linux kernel]
>> It contains *many* constructs that are not defined in, for
>> example, C99, and it would in fact be impossible to write the Linux
>> kernel using only C99-compliant constructs.
> 
> True.  On the other hand, it is possible to keep large parts of the
> kernel independent of compiler implementation details.  And it is not
> only possible but also beneficial, e.g. because the compiler's
> implementation changes over time.

It is, but this is not likely to be one of those things.

Either way, I fully agree with the following (from Jeff):

> jimmy bahuleyan wrote:
>> i believe, the doc here is pretty unambiguous regarding the fact that
>> volatile should be avoided. And as Stefan pointed out, anyone who feels
>> the need to use, must surely _know_ what he is doing & hence is in a
>> position t make that decision
> 
> Honestly, the above quoted paragraph states the situation better than any long, complicated document.

	-hpa
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