linux-kernel - RE: cpu hotplug support broken in 2.6.23-rc3

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Date:	Fri, 14 Sep 2007 11:49:17 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Pavel Machek" <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Jeff Chua" <jeff.chua.linux@...il.com>, <rusty@...tycorp.com.au>,
	<vatsa@...ibm.com>, <zwane@....linux.org.uk>,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Len Brown" <lenb@...nel.org>
Subject: RE: cpu hotplug support broken in 2.6.23-rc3

 

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org 
>[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of 
>Thomas Gleixner
>Sent: Friday, September 14, 2007 5:51 AM
>To: Pavel Machek
>Cc: Rafael J. Wysocki; Jeff Chua; rusty@...tycorp.com.au; 
>vatsa@...ibm.com; zwane@....linux.org.uk; kernel list; Len Brown
>Subject: Re: cpu hotplug support broken in 2.6.23-rc3
>
>Pavel,
>
>On Fri, 2007-09-14 at 14:38 +0200, Pavel Machek wrote:
>> > I have an yet untested fix, which preserves the broadcast 
>state across
>> > the offline state, but Len is looking into it as well, 
>whether we can
>> > just reevaluate the power states (and the broadcast flags) 
>when a cpu
>> > becomes online again. If Len can do that easily for 
>2.6.23, I'd prefer
>> > that.
>> 
>> Is there a patch you want me to test? Or does Len have anything to
>> play with?
>
>Venki sent me an initial patch, but it has issues with the notify
>ordering. Find below my "cache the broadcast flags" version 
>for testing.
>

While wirting that patch, I knew solution could not be that simple :(.
Does the patch work for online offline case atleast?
Will look at the Suspend/Resume ordering part in that case.

Thanks,
Venki
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