From 4ab00bdd99a906c089b5c20ee7b5cb91e7c61123 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 5 Dec 2019 15:53:28 -0800 Subject: [PATCH] rcutorture: Suppress boottime bad-sequence warnings In normal production, an excessively long wait on a grace period (synchronize_rcu(), for example) at boottime is often just as bad as at any other time. In fact, given the desire for fast boot, any sort of long wait at boot is a bad idea. However, heavy rcutorture testing on large hyperthreaded systems can generate such long waits during boot as a matter of course. This commit therefore causes the rcupdate.rcu_cpu_stall_suppress_at_boot kernel boot parameter to suppress reporting of bootime bad-sequence warning due to excessively long grace-period waits. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 16c84ec182bd..5efd9503df56 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1423,7 +1423,8 @@ rcu_torture_stats_print(void) pr_alert("%s%s ", torture_type, TORTURE_FLAG); pr_cont("rtc: %p %s: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", rcu_torture_current, - rcu_torture_current ? "ver" : "VER", + rcu_torture_current && !rcu_stall_is_suppressed_at_boot() + ? "ver" : "VER", rcu_torture_current_version, list_empty(&rcu_torture_freelist), atomic_read(&n_rcu_torture_alloc), -- 2.11.0