linux-kernel - Re: Linux 2.6.25-rc2

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Message-ID: <Pine.LNX.4.64.0802281211170.7699@twin.jikos.cz>
Date:	Thu, 28 Feb 2008 12:13:09 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Lameter <clameter@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: Linux 2.6.25-rc2

On Wed, 27 Feb 2008, Andrew Morton wrote:

> Doing ++ on a u32 _is_ atomic wrt interrupts on x86 and probably lots of
> other architectures, so we're OK using unsigned there.  

So you make implicit assumptions about how gcc compiles your ++? I am 
afraid you can't do that, gcc is absolutely free to turn variable++; 
statement to non-atomic sequence of instructions (memory->register load, 
increment register, for example).

-- 
Jiri Kosina
SUSE Labs

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