From 855bfe0de1a05a01f89975ea8ba9f5521fb0f567 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Sun, 1 Apr 2018 20:36:14 +1000 Subject: [PATCH] powerpc: hard disable irqs in smp_send_stop loop The hard lockup watchdog can fire under local_irq_disable on platforms with irq soft masking. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/smp.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index db88660..e16ec7b 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -574,9 +574,10 @@ static void stop_this_cpu(void *dummy) /* Remove this CPU */ set_cpu_online(smp_processor_id(), false); - local_irq_disable(); + hard_irq_disable(); + spin_begin(); while (1) - ; + spin_cpu_relax(); } void smp_send_stop(void) -- 2.7.4