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powerpc: Don't setup CPUs with bad status

Message ID 1402028931-13195-1-git-send-email-mikey@neuling.org (mailing list archive)
State Accepted
Commit 59a53afe70fd530040bdc69581f03d880157f15a
Headers show

Commit Message

Michael Neuling June 6, 2014, 4:28 a.m. UTC 
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@neuling.org>
Tested-by: Anton Blanchard <anton@samba.org>
cc: stable@vger.kernel.org
---
 arch/powerpc/kernel/setup-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index d4d4183..e239df3 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -471,7 +471,7 @@  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++;