diff options
| author | Zqiang <qiang1.zhang@intel.com> | 2021-12-29 00:05:10 +0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-02-01 17:19:02 -0800 |
| commit | 4b4399b2450de38916718ba9947e6cdb69c99c55 (patch) | |
| tree | 0b2a5f93689032a224d22b612590f7b88253afba /kernel/rcu | |
| parent | eae9f147a4b02e132187a2d88a403b9ccc28212a (diff) | |
rcu: Create per-cpu rcuc kthreads only when rcutree.use_softirq=0
The per-CPU "rcuc" kthreads are used only by kernels booted with
rcutree.use_softirq=0, but they are nevertheless unconditionally created
by kernels built with CONFIG_RCU_BOOST=y. This results in "rcuc"
kthreads being created that are never actually used. This commit
therefore refrains from creating these kthreads unless the kernel
is actually booted with rcutree.use_softirq=0.
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a4c25a6283b0..4e5e37e5ee3c 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2894,7 +2894,7 @@ static int __init rcu_spawn_core_kthreads(void) for_each_possible_cpu(cpu) per_cpu(rcu_data.rcu_cpu_has_work, cpu) = 0; - if (!IS_ENABLED(CONFIG_RCU_BOOST) && use_softirq) + if (use_softirq) return 0; WARN_ONCE(smpboot_register_percpu_thread(&rcu_cpu_thread_spec), "%s: Could not start rcuc kthread, OOM is now expected behavior\n", __func__); |