linux-kernel - Re: "APIC error on CPU1: 00(40)" during resume (was: Regression from 2.6.26: Hibernation (possibly suspend) broken on Toshiba R500)

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Date:	Wed, 10 Dec 2008 09:13:30 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
cc:	Frans Pop <elendil@...net.nl>, Ingo Molnar <mingo@...e.hu>,
	lenb@...nel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Greg KH <greg@...ah.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tiwai@...e.de, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: "APIC error on CPU1: 00(40)" during resume (was: Regression from
 2.6.26: Hibernation (possibly suspend) broken on Toshiba R500)



On Wed, 10 Dec 2008, Matthew Garrett wrote:

> On Wed, Dec 10, 2008 at 08:26:37AM -0800, Linus Torvalds wrote:
> 
> > So it looks like we don't reprogram the APIC -at-all- on secondary CPU's.
> > 
> > What am I missing?
> 
> We unplug all CPUs except the boot one at suspend time. Does the APIC 
> get reprogrammed when they're replugged on resume?

Ahh, indeed. That ends up doing setup_local_APIC() in smp_callin().

I wonder if we should do that from apic_resume() too - instead of saving 
any state we could probably just re-initialize it.

The setup_local_APIC() function also seems to be a lot more careful than 
"resume_apic()" is about ordering (well, at least it has _comments_ on the 
ordering), and it does things like ack'ing all pending irq's.

Hmm.

			Linus
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