Re: [stable] [patch 09/12] Fix SMP poweroff hangs

Greg KH
2007-10-09T22:59:59Z

On Tue, Oct 09, 2007 at 10:17:02AM -0500, Olof Johansson wrote:
> On Mon, Oct 08, 2007 at 11:06:33AM -0700, Greg KH wrote:
> > From: Mark Lord <lkml@rtr.ca>
> >
> > commit 4047727e5ae33f9b8d2b7766d1994ea6e5ec2991 from upstream
> >
> > We need to disable all CPUs other than the boot CPU (usually 0) before
> > attempting to power-off modern SMP machines. This fixes the
> > hang-on-poweroff issue on my MythTV SMP box, and also on Thomas Gleixner's
> > new toybox.
>
> Paul Mackerras has reported crashes when rebooting some older ppc64
> systems due to this patch.
>
> See http://ozlabs.org/pipermail/linuxppc-dev/2007-October/043969.html.

Has anything been done in mainline to possibly fix this?

If not, I think we'll leave it in, as it does solve a number of reported
problems.

thanks,

greg k-h