[PATCH 3.2 075/125] powerpc: Don't setup CPUs with bad status

From: Ben Hutchings
Date: Tue Jul 08 2014 - 15:36:40 EST

3.2.61-rc1 review patch. If anyone has any objections, please let me know.


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

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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
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
@@ -449,7 +449,7 @@ 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, intserv[j]);
- set_cpu_present(cpu, true);
+ set_cpu_present(cpu, of_device_is_available(dn));
set_hard_smp_processor_id(cpu, intserv[j]);
set_cpu_possible(cpu, true);

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/