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| author | Paul E. McKenney <paulmck@kernel.org> | 2025-09-23 02:02:43 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2025-09-23 02:02:43 -0700 |
| commit | ccd0256e697e369fc3cfa57d321074eaeac18dce (patch) | |
| tree | 9acb8218d61855c67003f54072f8eeb4d6e2ec8d /kernel/rcu/tree.c | |
| parent | 0e9e7023df282c7ec41e3f79e803c8feb49fcbe0 (diff) | |
| parent | 82c427bc935aa5b91d0cabbbc062e71132be2bb8 (diff) | |
Merge branch 'rcu.2025.09.23a' into HEAD
RCU miscellaneous updates:
* Document that rcu_barrier() hurries lazy callbacks
* Remove local_irq_save/restore() in rcu_preempt_deferred_qs_handler()
* Move list_for_each_rcu() to where it belongs
* Replace use of system_wq with system_percpu_wq
* WQ_PERCPU added to alloc_workqueue users
* WQ_UNBOUND added to sync_wq workqueue
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 8eff357b0436..31690ffa452a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3800,6 +3800,11 @@ static void rcu_barrier_handler(void *cpu_in) * to complete. For example, if there are no RCU callbacks queued anywhere * in the system, then rcu_barrier() is within its rights to return * immediately, without waiting for anything, much less an RCU grace period. + * In fact, rcu_barrier() will normally not result in any RCU grace periods + * beyond those that were already destined to be executed. + * + * In kernels built with CONFIG_RCU_LAZY=y, this function also hurries all + * pending lazy RCU callbacks. */ void rcu_barrier(void) { @@ -4885,10 +4890,10 @@ void __init rcu_init(void) rcutree_online_cpu(cpu); /* Create workqueue for Tree SRCU and for expedited GPs. */ - rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_MEM_RECLAIM, 0); + rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_MEM_RECLAIM | WQ_PERCPU, 0); WARN_ON(!rcu_gp_wq); - sync_wq = alloc_workqueue("sync_wq", WQ_MEM_RECLAIM, 0); + sync_wq = alloc_workqueue("sync_wq", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); WARN_ON(!sync_wq); /* Respect if explicitly disabled via a boot parameter. */ |