[PATCH v2 2/3] powerpc: hard disable irqs in smp_send_stop loop
Nicholas Piggin
npiggin at gmail.com
Sun Apr 1 20:36:14 AEST 2018
The hard lockup watchdog can fire under local_irq_disable
on platforms with irq soft masking.
Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
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 db88660bf6bd..e16ec7b3b427 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)
--
2.16.3
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