Merge tag 'stop-machine.2025.03.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

torvalds · torvalds · commit 8541bc1a52e7 · 2025-03-24T18:26:42.000-07:00
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()
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
@@ -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);

Original file line number	Diff line number	Diff line change
`@@ -250,6 +250,7 @@ static int multi_cpu_stop(void *data)`
`250`	`250`	`* be detected and reported on their side.`
`251`	`251`	`*/`
`252`	`252`	`touch_nmi_watchdog();`
	`253`	`+ /* Also suppress RCU CPU stall warnings. */`
`253`	`254`	`rcu_momentary_eqs();`
`254`	`255`	`}`
`255`	`256`	`} while (curstate != MULTI_STOP_EXIT);`