powerpc: mpc85xx regression since 2.6.39-rc2, one cpu core lame

From: Richard Cochran
Date: Tue May 17 2011 - 12:28:38 EST


Recent 2.6.39-rc kernels behave strangely on the Freescale dual core
mpc8572 and p2020. There is a long pause (like 2 seconds) in the boot
sequence after "mpic: requesting IPIs..."

When the system comes up, only one core shows in /proc/cpuinfo. Later
on, lots of messages appear like the following:

INFO: task ksoftirqd/1:9 blocked for more than 120 seconds.

I bisected [1] the problem to:

commit c56e58537d504706954a06570b4034c04e5b7500
Author: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Tue Mar 8 14:40:04 2011 +1100

powerpc/smp: Create idle threads on demand and properly reset them

I don't see from that commit what had gone wrong. Perhaps you can
help resolve this?


1. I had to patch commit e5462d16 by hand when bisecting, which is a
fixup for commit fa3f82c8 and not yet merged in c56e5853.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/