Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Richard Kuo <r...@codeaurora.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: linux-hexa...@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
---
arch/hexagon/kernel/smp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
index 0e364ca..30d4318 100644
--- a/arch/hexagon/kernel/smp.c
+++ b/arch/hexagon/kernel/smp.c
@@ -241,9 +241,12 @@ void smp_send_reschedule(int cpu)
void smp_send_stop(void)
{
struct cpumask targets;
+
+ get_online_cpus_atomic();
cpumask_copy(&targets, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &targets);
send_ipi(&targets, IPI_CPU_STOP);
+ put_online_cpus_atomic();
}
void arch_send_call_function_single_ipi(int cpu)
--
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