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rcu: Add comment to rcu_do_batch() identifying rcuoc code path
This commit adds a comment to help explain why the "else" clause of the in_serving_softirq() "if" statement does not need to enforce a time limit. The reason is that this "else" clause handles rcuoc kthreads that do not block handlers for other softirq vectors. Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
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