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rcutorture: Suppress boottime bad-sequence warnings

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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 <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2019-12-05 15:53:28 -08:00
parent 58c53360b3
commit 4ab00bdd99
1 changed files with 2 additions and 1 deletions
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3
kernel/rcu/rcutorture.c
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@ -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),