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rcutorture: Avoid soft lockup during cpu stall

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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>
This commit is contained in:
Wander Lairson Costa 2021-11-10 11:37:45 -03:00 committed by Paul E. McKenney
parent 81faa4f6fb
commit 5ff7c9f9d7
1 changed files with 5 additions and 0 deletions
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5
kernel/rcu/rcutorture.c
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@ -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();