This is a note to let you know that I've just added the patch titled
powerpc: Don't setup CPUs with bad status
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-don-t-setup-cpus-with-bad-status.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 59a53afe70fd530040bdc69581f03d880157f15a Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@xxxxxxxxxxx>
Date: Fri, 6 Jun 2014 14:28:51 +1000
Subject: powerpc: Don't setup CPUs with bad status
From: Michael Neuling <mikey@xxxxxxxxxxx>
commit 59a53afe70fd530040bdc69581f03d880157f15a upstream.
OPAL will mark a CPU that is guarded as "bad" in the status property of the CPU
node.
Unfortunatley Linux doesn't check this property and will put the bad CPU in the
present map. This has caused hangs on booting when we try to unsplit the core.
This patch checks the CPU is avaliable via this status property before putting
it in the present map.
Signed-off-by: Michael Neuling <mikey@xxxxxxxxxxx>
Tested-by: Anton Blanchard <anton@xxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/setup-common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -461,7 +461,7 @@ void __init smp_setup_cpu_maps(void)
for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
DBG(" thread %d -> cpu %d (hard id %d)\n",
j, cpu, be32_to_cpu(intserv[j]));
- set_cpu_present(cpu, true);
+ set_cpu_present(cpu, of_device_is_available(dn));
set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
set_cpu_possible(cpu, true);
cpu++;
Patches currently in stable-queue which might be from mikey@xxxxxxxxxxx are
queue-3.15/powerpc-don-t-skip-epapr-spin-table-cpus.patch
queue-3.15/powerpc-don-t-setup-cpus-with-bad-status.patch
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