Commit 5c9a9ca4 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu-tasks: Idle tasks on offline CPUs are in quiescent states 



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: default avatarPaul 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>
parent 9ff86b4c

kernel/rcu/tasks.h

+1 −1
Original line number Diff line number Diff line
@@ -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.