From: Paul E. McKenney <[email protected]> commit 5c9a9ca44fda41c5e82f50efced5297a9c19760d upstream
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 <[email protected]> Cc: Neeraj Upadhyay <[email protected]> Cc: Eric Dumazet <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Andrii Nakryiko <[email protected]> Cc: Martin KaFai Lau <[email protected]> Cc: KP Singh <[email protected]> Signed-off-by: Krister Johansen <[email protected]> --- 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 bede3a4f108e..ea45a2d53a99 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1007,7 +1007,7 @@ 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. -- 2.25.1
