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stop-machine: Add a comment for rcu_momentary_eqs()

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Changes
 -------
 
 * Add a comment for the call to rcu_momentary_eqs() from multi_cpu_stop()
   explaining that its purpose is to suppress false-positive RCU CPU
   stall warnings.
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Merge tag 'stop-machine.2025.03.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull stop-machine update from Paul McKenney:

 - Add a comment for the call to rcu_momentary_eqs() from
   multi_cpu_stop() explaining that its purpose is to suppress
   false-positive RCU CPU stall warnings

* tag 'stop-machine.2025.03.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  stop-machine: Add comment for rcu_momentary_eqs()
This commit is contained in:
Linus Torvalds 2025-03-24 18:26:42 -07:00
commit 8541bc1a52
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);