47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
From: Greg Kurz <gkurz@linux.vnet.ibm.com>
|
|
Date: Fri, 12 Dec 2014 12:37:40 +0100
|
|
Subject: [PATCH] powerpc/powernv: force all CPUs to be bootable
|
|
|
|
The subcore logic needs all the CPUs declared in the DT to be bootable,
|
|
otherwise the kernel hangs at boot time. Since subcore support starts
|
|
with POWER8, we can keep the current behaviour for older CPUs.
|
|
|
|
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
|
|
---
|
|
arch/powerpc/platforms/powernv/smp.c | 13 ++++++++++++-
|
|
1 file changed, 12 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
|
|
index 4753958cd509..44ecd0925f56 100644
|
|
--- a/arch/powerpc/platforms/powernv/smp.c
|
|
+++ b/arch/powerpc/platforms/powernv/smp.c
|
|
@@ -185,13 +185,24 @@ static void pnv_smp_cpu_kill_self(void)
|
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
+static int pnv_cpu_bootable(unsigned int nr)
|
|
+{
|
|
+ /* Starting with POWER8, all CPUs need to be booted to avoid hangs
|
|
+ * during subcore init.
|
|
+ */
|
|
+ if (cpu_has_feature(CPU_FTR_ARCH_207S))
|
|
+ return 1;
|
|
+
|
|
+ return smp_generic_cpu_bootable(nr);
|
|
+}
|
|
+
|
|
static struct smp_ops_t pnv_smp_ops = {
|
|
.message_pass = smp_muxed_ipi_message_pass,
|
|
.cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */
|
|
.probe = xics_smp_probe,
|
|
.kick_cpu = pnv_smp_kick_cpu,
|
|
.setup_cpu = pnv_smp_setup_cpu,
|
|
- .cpu_bootable = smp_generic_cpu_bootable,
|
|
+ .cpu_bootable = pnv_cpu_bootable,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_disable = pnv_smp_cpu_disable,
|
|
.cpu_die = generic_cpu_die,
|
|
--
|
|
2.1.0
|
|
|