From fd13fe16db0d82612b260640f4e26f6d9d1e11fd Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 6 Aug 2021 08:57:26 -0700 Subject: [PATCH] rcutorture: Don't cpuhp_remove_state() if cpuhp_setup_state() failed Currently, in CONFIG_RCU_BOOST kernels, if the rcu_torture_init() function's call to cpuhp_setup_state() fails, rcu_torture_cleanup() gamely passes nonsense to cpuhp_remove_state(). This results in strange and misleading splats. This commit therefore ensures that if the rcu_torture_init() function's call to cpuhp_setup_state() fails, rcu_torture_cleanup() avoids invoking cpuhp_remove_state(). Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index b90cd4d..4241847 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2819,7 +2819,7 @@ rcu_torture_cleanup(void) rcutorture_seq_diff(gp_seq, start_gp_seq)); torture_stop_kthread(rcu_torture_stats, stats_task); torture_stop_kthread(rcu_torture_fqs, fqs_task); - if (rcu_torture_can_boost()) + if (rcu_torture_can_boost() && rcutor_hp >= 0) cpuhp_remove_state(rcutor_hp); /* @@ -3132,9 +3132,9 @@ rcu_torture_init(void) firsterr = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "RCU_TORTURE", rcutorture_booster_init, rcutorture_booster_cleanup); + rcutor_hp = firsterr; if (torture_init_error(firsterr)) goto unwind; - rcutor_hp = firsterr; // Testing RCU priority boosting requires rcutorture do // some serious abuse. Counter this by running ksoftirqd -- 2.7.4