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authorWander Lairson Costa <wander@redhat.com>2021-11-10 11:37:45 -0300
committerPaul E. McKenney <paulmck@kernel.org>2021-12-07 16:36:17 -0800
commit5ff7c9f9d7e3e0f6db5b81945fa11b69d62f433a (patch)
tree097c4a0b2ddbfb96bfc87990afbf7e8aee51dbca /kernel/rcu/rcutorture.c
parent81faa4f6fba429334ff72bb5ba7696818509b5b5 (diff)
rcutorture: Avoid soft lockup during cpu stall
If we use the module stall_cpu option, we may get a soft lockup warning in case we also don't pass the stall_cpu_block option. Introduce the stall_no_softlockup option to avoid a soft lockup on cpu stall even if we don't use the stall_cpu_block option. Signed-off-by: Wander Lairson Costa <wander@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/rcutorture.c')
-rw-r--r--kernel/rcu/rcutorture.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 36a273589a35..bc854f935548 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -46,6 +46,7 @@
#include <linux/oom.h>
#include <linux/tick.h>
#include <linux/rcupdate_trace.h>
+#include <linux/nmi.h>
#include "rcu.h"
@@ -112,6 +113,8 @@ torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable.");
torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable.");
torture_param(int, stall_cpu_holdoff, 10,
"Time to wait before starting stall (s).");
+torture_param(bool, stall_no_softlockup, false,
+ "Avoid softlockup warning during cpu stall.");
torture_param(int, stall_cpu_irqsoff, 0, "Disable interrupts while stalling.");
torture_param(int, stall_cpu_block, 0, "Sleep while stalling.");
torture_param(int, stall_gp_kthread, 0,
@@ -2085,6 +2088,8 @@ static int rcu_torture_stall(void *args)
#else
schedule_timeout_uninterruptible(HZ);
#endif
+ } else if (stall_no_softlockup) {
+ touch_softlockup_watchdog();
}
if (stall_cpu_irqsoff)
local_irq_enable();

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