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rcu: Update __call_rcu() comments
The __call_rcu() function's header comment refers to a cpu argument that no longer exists, and the comment of the return path from rcu_nocb_try_bypass() ignores the non-no-CBs CPU case. This commit therefore update both comments. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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1 changed files with 2 additions and 7 deletions
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@ -2642,12 +2642,7 @@ static void check_cb_ovld(struct rcu_data *rdp)
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raw_spin_unlock_rcu_node(rnp);
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}
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/*
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* Helper function for call_rcu() and friends. The cpu argument will
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* normally be -1, indicating "currently running CPU". It may specify
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* a CPU only if that CPU is a no-CBs CPU. Currently, only rcu_barrier()
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* is expected to specify a CPU.
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*/
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/* Helper function for call_rcu() and friends. */
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static void
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__call_rcu(struct rcu_head *head, rcu_callback_t func)
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{
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@ -2688,7 +2683,7 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func)
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check_cb_ovld(rdp);
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if (rcu_nocb_try_bypass(rdp, head, &was_alldone, flags))
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return; // Enqueued onto ->nocb_bypass, so just leave.
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/* If we get here, rcu_nocb_try_bypass() acquired ->nocb_lock. */
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// If no-CBs CPU gets here, rcu_nocb_try_bypass() acquired ->nocb_lock.
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rcu_segcblist_enqueue(&rdp->cblist, head);
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if (__is_kfree_rcu_offset((unsigned long)func))
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trace_rcu_kfree_callback(rcu_state.name, head,
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