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

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Message-Id: <1189775743.3100.9.camel@chaos>
Date:	Fri, 14 Sep 2007 15:15:43 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	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

On Fri, 2007-09-14 at 14:50 +0200, Thomas Gleixner wrote:
> 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.

Hmmpf, the flag is still cleared when the cpu goes offline. Need to take
a closer look.

	tglx


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