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Date:	Tue, 22 Jul 2014 15:22:01 -0700
From:	Kamal Mostafa <>
Cc:	Scott Wood <>,
	Michael Neuling <>,
	Emil Medve <>,
	Benjamin Herrenschmidt <>,
	Kamal Mostafa <>
Subject: [PATCH 3.8 110/116] powerpc: Don't skip ePAPR spin-table CPUs -stable review patch.  If anyone has any objections, please let me know.


From: Scott Wood <>

commit 6663a4fa6711050036562ddfd2086edf735fae21 upstream.

Commit 59a53afe70fd530040bdc69581f03d880157f15a "powerpc: Don't setup
CPUs with bad status" broke ePAPR SMP booting.  ePAPR says that CPUs
that aren't presently running shall have status of disabled, with
enable-method being used to determine whether the CPU can be enabled.

Fix by checking for spin-table, which is currently the only supported

Signed-off-by: Scott Wood <>
Cc: Michael Neuling <>
Cc: Emil Medve <>
Signed-off-by: Benjamin Herrenschmidt <>
Signed-off-by: Kamal Mostafa <>
 arch/powerpc/kernel/setup-common.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index b050263..069f857 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -455,9 +455,17 @@ void __init smp_setup_cpu_maps(void)
 		for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
+			bool avail;
 			DBG("    thread %d -> cpu %d (hard id %d)\n",
 			    j, cpu, intserv[j]);
-			set_cpu_present(cpu, of_device_is_available(dn));
+			avail = of_device_is_available(dn);
+			if (!avail)
+				avail = !of_property_match_string(dn,
+						"enable-method", "spin-table");
+			set_cpu_present(cpu, avail);
 			set_hard_smp_processor_id(cpu, intserv[j]);
 			set_cpu_possible(cpu, true);

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