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stop-machine: Add comment for rcu_momentary_eqs()

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Add a comment to explain the purpose of the rcu_momentary_eqs() call
from multi_cpu_stop(), which is to suppress false-positive RCU CPU
stall warnings.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/87wmeuanti.ffs@tglx/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney 2025-03-06 10:12:31 -08:00
parent 2014c95afe
commit 2af8780d6c
1 changed files with 1 additions and 0 deletions
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kernel/stop_machine.c
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@ -250,6 +250,7 @@ static int multi_cpu_stop(void *data)
* be detected and reported on their side.
*/
touch_nmi_watchdog();
/* Also suppress RCU CPU stall warnings. */
rcu_momentary_eqs();
}
} while (curstate != MULTI_STOP_EXIT);