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From: Greg Kurz <gkurz@linux.vnet.ibm.com>
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Date: Fri, 12 Dec 2014 12:37:40 +0100
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Subject: [PATCH] powerpc/powernv: force all CPUs to be bootable
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The subcore logic needs all the CPUs declared in the DT to be bootable,
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otherwise the kernel hangs at boot time. Since subcore support starts
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with POWER8, we can keep the current behaviour for older CPUs.
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Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
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---
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arch/powerpc/platforms/powernv/smp.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
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index 5fcfcf44e3a9..52552e60df36 100644
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--- a/arch/powerpc/platforms/powernv/smp.c
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+++ b/arch/powerpc/platforms/powernv/smp.c
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@@ -185,13 +185,24 @@ static void pnv_smp_cpu_kill_self(void)
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#endif /* CONFIG_HOTPLUG_CPU */
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+static int pnv_cpu_bootable(unsigned int nr)
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+{
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+ /* Starting with POWER8, all CPUs need to be booted to avoid hangs
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+ * during subcore init.
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+ */
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+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
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+ return 1;
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+
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+ return smp_generic_cpu_bootable(nr);
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+}
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+
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static struct smp_ops_t pnv_smp_ops = {
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.message_pass = smp_muxed_ipi_message_pass,
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.cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */
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.probe = xics_smp_probe,
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.kick_cpu = pnv_smp_kick_cpu,
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.setup_cpu = pnv_smp_setup_cpu,
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- .cpu_bootable = smp_generic_cpu_bootable,
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+ .cpu_bootable = pnv_cpu_bootable,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_disable = pnv_smp_cpu_disable,
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.cpu_die = generic_cpu_die,
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--
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2.1.0
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