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authorPaul E. McKenney <paulmck@kernel.org>2019-07-10 08:01:01 -0700
committerPaul E. McKenney <paulmck@kernel.org>2019-10-05 10:46:05 -0700
commit366237e7b0833faa2d8da7a8d7d7da8c3ca802e5 (patch)
tree5944c55f1dd161c7c1a2420fb259854930324df2 /kernel/stop_machine.c
parentd38e6dc6ed0dfef8d323354031a1ee1a7cfdedc1 (diff)
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>
Diffstat (limited to 'kernel/stop_machine.c')
-rw-r--r--kernel/stop_machine.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index c7031a22aa7b..34c4f117d8c7 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);