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stop_machine: Provide RCU quiescent state in multi_cpu_stop()

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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>
This commit is contained in:
Paul E. McKenney 2019-07-10 08:01:01 -07:00
parent d38e6dc6ed
commit 366237e7b0
3 changed files with 3 additions and 1 deletions
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1
kernel/stop_machine.c
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@ -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);