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rcu: Use rcuc threads on PREEMPT_RT as we did 

While switching to the reworked RCU-thread code, it has been forgotten
to enable the thread processing on -RT.
Besides restoring behavior that used to be default on RT, this avoids
a deadlock on scheduler locks.

Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Scott Wood 2019-09-11 17:57:28 +01:00 committed by Alibek Omarov
parent 27de62e778
commit fc049aaf7b
1 changed files with 3 additions and 1 deletions
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4
kernel/rcu/tree.c
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@ -100,8 +100,10 @@ struct rcu_state rcu_state = {
static bool dump_tree;
module_param(dump_tree, bool, 0444);
/* By default, use RCU_SOFTIRQ instead of rcuc kthreads. */
static bool use_softirq = 1;
static bool use_softirq = !IS_ENABLED(CONFIG_PREEMPT_RT);
#ifndef CONFIG_PREEMPT_RT
module_param(use_softirq, bool, 0444);
#endif
/* Control rcu_node-tree auto-balancing at boot time. */
static bool rcu_fanout_exact;
module_param(rcu_fanout_exact, bool, 0444);