linux-kernel - Re: [RFC] Avoid PIT SMP lockups

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Message-ID: <4533AE82.6010502@suse.de>
Date:	Mon, 16 Oct 2006 18:08:34 +0200
From:	Gerd Hoffmann <kraxel@...e.de>
To:	john stultz <johnstul@...ibm.com>
Cc:	caglar@...dus.org.tr, Andi Kleen <ak@...e.de>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Avoid PIT SMP lockups

john stultz wrote:
> Hey Gerd,
> 	Looks like the smp replacements code in 2.6.18 is breaking with vmware.
> I'm guessing we're taking an interrupt while apply_replacements is
> running. Any ideas?

It's not the smp alternatives code, its the one for processor-specific
instructions.  The eip offset for alternative_instructions() in the
trace suggests it is the first call to apply_replacements.  The second
one is the one for the smp alternatives (which doesn't do anything btw
as we patch away the lock prefixes only).

cheers,

  Gerd

-- 
Gerd Hoffmann <kraxel@...e.de>
http://www.suse.de/~kraxel/julika-dora.jpeg
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