Commit b692dc4a authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@kernel.org>
parent aa96a93b

kernel/rcu/tree.c

+2 −7
Original line number Diff line number Diff line
@@ -2642,12 +2642,7 @@ static void check_cb_ovld(struct rcu_data *rdp) 
	raw_spin_unlock_rcu_node(rnp);

}



/*

 * Helper function for call_rcu() and friends.  The cpu argument will

 * normally be -1, indicating "currently running CPU".  It may specify

 * a CPU only if that CPU is a no-CBs CPU.  Currently, only rcu_barrier()

 * is expected to specify a CPU.

 */

/* Helper function for call_rcu() and friends.  */

static void

__call_rcu(struct rcu_head *head, rcu_callback_t func)

{
@@ -2688,7 +2683,7 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func) 
	check_cb_ovld(rdp);

	if (rcu_nocb_try_bypass(rdp, head, &was_alldone, flags))

		return; // Enqueued onto ->nocb_bypass, so just leave.

	/* If we get here, rcu_nocb_try_bypass() acquired ->nocb_lock. */

	// If no-CBs CPU gets here, rcu_nocb_try_bypass() acquired ->nocb_lock.

	rcu_segcblist_enqueue(&rdp->cblist, head);

	if (__is_kfree_rcu_offset((unsigned long)func))

		trace_rcu_kfree_callback(rcu_state.name, head,