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

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commit 5c9a9ca44f 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 <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>
Signed-off-by: Krister Johansen <kjlx@templeofstupid.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-11-22 00:48:03 -08:00 committed by Greg Kroah-Hartman
parent e01ff1251c
commit 36741bfcfb
1 changed files with 1 additions and 1 deletions
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kernel/rcu/tasks.h
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@ -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.