Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH rcu 08/32] rcu-tasks: Idle tasks on offline CPUs are in quiescent states | Date | Mon, 20 Jun 2022 15:53:47 -0700 |
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Any idle task corresponding to an offline CPU is in an RCU Tasks Trace quiescent state. This commit causes rcu_tasks_trace_postscan() to ignore idle tasks for offline CPUs, which it can do safely due to CPU-hotplug operations being disabled.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Martin KaFai Lau <kafai@fb.com> Cc: KP Singh <kpsingh@kernel.org> --- kernel/rcu/tasks.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 8fe78a7fecafd..ec68bfe98c958 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1451,7 +1451,7 @@ static void rcu_tasks_trace_postscan(struct list_head *hop) { int cpu; - for_each_possible_cpu(cpu) + for_each_online_cpu(cpu) rcu_tasks_trace_pertask(idle_task(cpu), hop); // Re-enable CPU hotplug now that the tasklist scan has completed. -- 2.31.1.189.g2e36527f23
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