Commit 92a708dc authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Frederic Weisbecker
Browse files

rcu-tasks: Add printk()s to localize boot-time self-test hang 



Currently, rcu_tasks_initiate_self_tests() prints a message and then
initiates self tests on up to three different RCU Tasks flavors.  If one
of the flavors has a grace-period hang, it is not easy to work out which
of the three hung.  This commit therefore prints a message prior to each
individual test.

Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
parent 0bb80ecc

kernel/rcu/tasks.h

+3 −1
Original line number Diff line number Diff line
@@ -1979,20 +1979,22 @@ static void test_rcu_tasks_callback(struct rcu_head *rhp) 


static void rcu_tasks_initiate_self_tests(void)

{

	pr_info("Running RCU-tasks wait API self tests\n");

#ifdef CONFIG_TASKS_RCU

	pr_info("Running RCU Tasks wait API self tests\n");

	tests[0].runstart = jiffies;

	synchronize_rcu_tasks();

	call_rcu_tasks(&tests[0].rh, test_rcu_tasks_callback);

#endif



#ifdef CONFIG_TASKS_RUDE_RCU

	pr_info("Running RCU Tasks Rude wait API self tests\n");

	tests[1].runstart = jiffies;

	synchronize_rcu_tasks_rude();

	call_rcu_tasks_rude(&tests[1].rh, test_rcu_tasks_callback);

#endif



#ifdef CONFIG_TASKS_TRACE_RCU

	pr_info("Running RCU Tasks Trace wait API self tests\n");

	tests[2].runstart = jiffies;

	synchronize_rcu_tasks_trace();

	call_rcu_tasks_trace(&tests[2].rh, test_rcu_tasks_callback);