3  * RCU CPU stall warnings for normal RCU grace periods
16 /* panic() on RCU Stall sysctl. */
53  * useful when deciding whether to allocate memory to enable RCU-mediated
78 /* Don't do RCU CPU stall warnings during long sysrq printouts. */
91 /* Don't print RCU CPU stall warnings during a kernel panic. */
118 		panic("RCU Stall\n");  in panic_on_rcu_stall()
134 // Interaction with RCU grace periods
150 /* Zero ->ticks_this_gp and snapshot the number of RCU softirq handlers. */
180  * Handler for the irq_work request posted about halfway into the RCU CPU
201 // Printing RCU CPU stall warnings
206  * Dump detailed information for all tasks blocking the current RCU
232 // Communicate task state back to the RCU CPU stall warning request.
241  * current RCU grace period.
256  * Scan the current list of tasks blocked within RCU read-side critical
306  * Because preemptible RCU does not exist, we never have to check for
307  * tasks blocked within RCU read-side critical sections.
314  * Because preemptible RCU does not exist, we never have to check for
315  * tasks blocked within RCU read-side critical sections.
392 /* Is the RCU grace-period kthread being starved of CPU time? */
405  * If the specified CPU is aware of the current RCU grace period, then
408  * of RCU grace periods that this CPU is ignorant of, for example, "1"
474 			pr_err("RCU grace-period kthread stack dump:\n");  in rcu_check_gp_kthread_starvation()
478 					pr_err("RCU GP kthread last ran on offline CPU %d.\n", cpu);  in rcu_check_gp_kthread_starvation()
480 					pr_err("Stack dump where RCU GP kthread last ran:\n");  in rcu_check_gp_kthread_starvation()
539 	 * See Documentation/RCU/stallwarn.rst for info on how to debug  in print_other_cpu_stall()
540 	 * RCU CPU stall warnings.  in print_other_cpu_stall()
610 	 * See Documentation/RCU/stallwarn.rst for info on how to debug  in print_cpu_stall()
611 	 * RCU CPU stall warnings.  in print_cpu_stall()
639 	 * Attempt to revive the RCU machinery by forcing a context switch.  in print_cpu_stall()
641 	 * A context switch would normally allow the RCU state machine to make  in print_cpu_stall()
704 		 * the watchdog like an RCU stall. Check to see if the host  in check_cpu_stall()
722 		 * the watchdog like an RCU stall. Check to see if the host  in check_cpu_stall()
742 // RCU forward-progress mechanisms, including of callback invocation.
746  * Check to see if a failure to end RCU priority inversion was due to
748  * is nothing that RCU priority boosting can do to help, so we shouldn't
749  * count this as an RCU priority boosting failure.  A return of true says
750  * RCU priority boosting is to blame, and false says otherwise.  If false
797 	// Can't blame CPUs, so must blame RCU priority boosting.  in rcu_check_boost_fail()
865 	pr_info("RCU callbacks invoked since boot: %lu\n", cbs);  in show_rcu_gp_kthreads()
872  * RCU to come out of its idle mode.
970 /* Commandeer a sysrq key to dump RCU's tree. */
982 	.help_msg = "show-rcu(y)",
983 	.action_msg = "Show RCU tree",