stop_machine: Provide RCU quiescent state in multi_cpu_stop()
When multi_cpu_stop() loops waiting for other tasks, it can trigger an RCU
CPU stall warning. This can be misleading because what is instead needed
is information on whatever task is blocking multi_cpu_stop(). This commit
therefore inserts an RCU quiescent state into the multi_cpu_stop()
function's waitloop.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index c7031a2..34c4f11 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -233,6 +233,7 @@ static int multi_cpu_stop(void *data)
*/
touch_nmi_watchdog();
}
+ rcu_momentary_dyntick_idle();
} while (curstate != MULTI_STOP_EXIT);
local_irq_restore(flags);
