rcu-tasks: Improve comments explaining tasks_rcu_exit_srcu purpose
Make sure we don't need to look again into the depths of git blame in order not to miss a subtle part about how rcu-tasks is dealing with exiting tasks. Suggested-by: Boqun Feng <boqun.feng@gmail.com> Suggested-by: Neeraj Upadhyay <quic_neeraju@quicinc.com> Suggested-by: Paul E. McKenney <paulmck@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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