linux-kernel - Re: [PATCH 3/3] [UDP6]: Counter increment on BH mode

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Message-ID: <20071216085818.GA27280@elte.hu>
Date:	Sun, 16 Dec 2007 09:58:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Wang Chen <wangchen@...fujitsu.com>,
	Gerrit Renker <gerrit@....abdn.ac.uk>, davem@...emloft.net,
	andi@...stfloor.org, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 3/3] [UDP6]: Counter increment on BH mode


* Herbert Xu <herbert@...dor.apana.org.au> wrote:

> On Sat, Dec 15, 2007 at 07:43:28PM +0100, Ingo Molnar wrote:
> >
> > we could perhaps introduce stat_smp_processor_id(), which signals that 
> > the CPU id is used for statistical purposes and does not have to be 
> > exact? In any case, your patch looks good too.
> 
> Unfortunately that doesn't work because we can then have two CPUs 
> trying to update the same counter which may corrupt it.

ah, indeed. I missed that correctness aspect of your patch. Good catch!

	Ingo
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