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rcutorture: Create nocb kthreads only when testing rcu in CONFIG_RCU_NOCB_CPU=y kernels

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Given a non-zero rcutorture.nocbs_nthreads module parameter, the specified
number of nocb kthreads will be created, regardless of whether or not
the RCU implementation under test is capable of offloading callbacks.
Please note that even vanilla RCU is incapable of offloading in kernels
built with CONFIG_RCU_NOCB_CPU=n.  And when the RCU implementation is
incapable of offloading callbacks, there is no point in creating those
kthreads.

This commit therefore checks the cur_ops.torture_type module parameter and
CONFIG_RCU_NOCB_CPU Kconfig option in order to avoid creating unnecessary
nocb tasks.

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
[ boqun: Fix checkpatch warning ]
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Zqiang 2023-02-03 14:40:54 +08:00 committed by Boqun Feng
parent 877a0e83c5
commit 4f02ac2378
1 changed files with 6 additions and 0 deletions
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6
kernel/rcu/rcutorture.c
View file

@ -3525,6 +3525,12 @@ rcu_torture_init(void)
pr_alert("rcu-torture: ->fqs NULL and non-zero fqs_duration, fqs disabled.\n");
fqs_duration = 0;
}
if (nocbs_nthreads != 0 && (cur_ops != &rcu_ops ||
!IS_ENABLED(CONFIG_RCU_NOCB_CPU))) {
pr_alert("rcu-torture types: %s and CONFIG_RCU_NOCB_CPU=%d, nocb toggle disabled.\n",
cur_ops->name, IS_ENABLED(CONFIG_RCU_NOCB_CPU));
nocbs_nthreads = 0;
}
if (cur_ops->init)
cur_ops->init();