[stable] PROBLEM: 2.6.39 doesn’t boot on POWER MAC

[Greg KH]

On Fri, Jun 03, 2011 at 01:10:45PM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2011-06-03 at 12:41 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2011-06-03 at 00:00 +0200, Giuliano Pochini wrote:
> > > On Sat, 28 May 2011 11:55:14 +0400
> > > Andrey Gusev <ronne at list.ru> wrote:
> > > 
> > > > Hi!
> > > > A kernel 2.6.39 doesn't boot on my POWER MAC G4.
> > > 
> > > Same problem with my dual-G4 MDD. A few more infos:
> > > The machine hangs just after the message "Returning from prom_init" (still
> > > in the OF screen).
> > > The kernel works fine with the option maxcpus=1, but it locks up as soon as
> > > I try to enable the second CPU with echo 1 > /sys.../online.
> > 
> > I just verified that current upstream 3.0-rc1+ does boot fine.
> 
> The fix is:
> 
>   c560bbceaf6b06e52f1ef20131b76a3fdc0a2c19
>   powerpc/4xx: Fix regression in SMP on 476
> 
> It looks like the regression wasn't specific to 476 but to all ppc
> 32-bit SMP setups. The bugs is specific to 2.6.39.
> 
> Greg, it should cherry-pick as-is but here's a copy in case you need it.

Now applied, thanks.

greg k-h