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:

quoted

On Fri, 2011-06-03 at 00:00 +0200, Giuliano Pochini wrote:

quoted

On Sat, 28 May 2011 11:55:14 +0400
Andrey Gusev [off-list ref] wrote:

quoted

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