netdev - Re: [PATCH 2.6.27-rc8 5/6] e1000e: debug contention on NVM SWFLAG

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Message-ID: <alpine.LNX.1.10.0810031736150.26779@jikos.suse.cz>
Date:	Fri, 3 Oct 2008 17:39:17 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	arjan@...ux.intel.com, airlied@...il.com, davem@...emloft.net,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [PATCH 2.6.27-rc8 5/6] e1000e: debug contention on NVM SWFLAG

On Fri, 3 Oct 2008, Linus Torvalds wrote:

> > The debugging message is racy anyway with respect to accessing 
> > nvm_owner, right? It should be done after the mutex has been 
> > succesfully acquired.
> It's done that way on purpose - to see who _could_ be racing.

I know. I just wanted to point out that we probably don't want the patch 
in 2.6.27 in this form, users wouldn't like to have warning in their logs 
every time mutex is not acquired on a first attempt :)

We are currently running reproduction tests on affected machines to verify 
that this patch really fixes the root cause of this whole e1000e saga.

-- 
Jiri Kosina
SUSE Labs
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