Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 48983260 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
Browse files

rcu: Make rcutorture give diagnostics if CPU offline fails 



This commit causes rcutorture to print the errno if cpu_down() fails
when the rcutorture "verbose" module parameter is specified.

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent abfd6e58

kernel/rcutorture.c

+8 −1
Original line number Diff line number Diff line
@@ -1502,6 +1502,7 @@ rcu_torture_onoff(void *arg) 
	unsigned long delta;

	int maxcpu = -1;

	DEFINE_RCU_RANDOM(rand);

	int ret;

	unsigned long starttime;



	VERBOSE_PRINTK_STRING("rcu_torture_onoff task started");
@@ -1522,7 +1523,13 @@ rcu_torture_onoff(void *arg) 
					 torture_type, cpu);

			starttime = jiffies;

			n_offline_attempts++;

			if (cpu_down(cpu) == 0) {

			ret = cpu_down(cpu);

			if (ret) {

				if (verbose)

					pr_alert("%s" TORTURE_FLAG

						 "rcu_torture_onoff task: offline %d failed: errno %d\n",

						 torture_type, cpu, ret);

			} else {

				if (verbose)

					pr_alert("%s" TORTURE_FLAG

						 "rcu_torture_onoff task: offlined %d\n",