[PATCH 10/23] cpu: Use RCU to protect access of HK_TYPE_TIMER cpumask

[Waiman Long]

As HK_TYPE_TIMER cpumask is going to be changeable at run time, use
RCU to protect access to the cpumask.

Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
 kernel/cpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index bc4f7a9ba64e..0d02b5d7a7ba 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1890,6 +1890,8 @@ int freeze_secondary_cpus(int primary)
 	cpu_maps_update_begin();
 	if (primary == -1) {
 		primary = cpumask_first(cpu_online_mask);
+
+		guard(rcu)();
 		if (!housekeeping_cpu(primary, HK_TYPE_TIMER))
 			primary = housekeeping_any_cpu(HK_TYPE_TIMER);
 	} else {
-- 
2.53.0