From: Paul E. McKenney <paul...@kernel.org>
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 <paul...@kernel.org>
Cc: Neeraj Upadhyay <quic_neer...@quicinc.com>
Cc: Eric Dumazet <eduma...@google.com>
Cc: Alexei Starovoitov <a...@kernel.org>
Cc: Andrii Nakryiko <and...@kernel.org>
Cc: Martin KaFai Lau <ka...@fb.com>
Cc: KP Singh <kpsi...@kernel.org>
Signed-off-by: Krister Johansen <k...@templeofstupid.com>
---
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 5528c172570b..8648685e7dfa 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1090,7 +1090,7 @@ 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
