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Message-Id: <1406067727-19683-111-git-send-email-kamal@canonical.com> Date: Tue, 22 Jul 2014 15:22:01 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Scott Wood <scottwood@...escale.com>, Michael Neuling <mikey@...ling.org>, Emil Medve <Emilian.Medve@...escale.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.8 110/116] powerpc: Don't skip ePAPR spin-table CPUs 3.8.13.27 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Scott Wood <scottwood@...escale.com> 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 enable-method. Signed-off-by: Scott Wood <scottwood@...escale.com> Cc: Michael Neuling <mikey@...ling.org> Cc: Emil Medve <Emilian.Medve@...escale.com> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- 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); cpu++; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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