linux-kernel - Re: [PATCH] ioapic: fix potential resume deadlock

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Message-ID: <20110516113205.GF19837@elte.hu>
Date:	Mon, 16 May 2011 13:32:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel J Blueman <daniel.blueman@...il.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ioapic: fix potential resume deadlock


* Daniel J Blueman <daniel.blueman@...il.com> wrote:

> Hi Suresh,
> 
> On 14 May 2011 01:48, Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> > On Wed, 2011-05-11 at 09:15 -0700, Daniel J Blueman wrote:
> >> Superb, this works, tested against 2.6.39-rc7 and addresses the "BUG:
> >> sleeping function called from invalid context at mm/slub.c:824"
> >> warning I was previously seeing. It would be good to get this fix into
> >> 2.6.39-final if possible.
> >>
> >> Tested-by: Daniel J Blueman <daniel.blueman@...il.com>
> >
> > Thanks Daniel for testing my quick patch. I have appended the complete
> > patch which cleans up this code.
> >
> > Ingo, This patch is relatively big (mostly removes the duplicate code
> > and changes the location where we allocate ioapic_saved_data, so that
> > this can be shared between interrupt-remapping and io-apic
> > suspend/resume flows). May be this can go into 2.6.40-rc1 and probably
> > go to 2.6.39-stable?
> >
> > Or we can take the Daniel's GFP_ATOMIC patch for 2.6.39 and push this
> > patch for 2.6.40-rc1. I am ok either way.
> []
> 
> Testing this, all looks well in that the patch resolves the
> potentially sleeping allocation, however I do see (on boot) this
> suspicious message (though suspend and resume does work):
> 
> IOAPIC 0: suspend/resume impossible!
> 
> I guess it's not expected...

No. Has this been introduced by Suresh's patch?

Thanks,

	Ingo
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