linux-kernel - [PATCH rcu 15/25] rcu-tasks: Remove grace-period fast-path rcu-tasks helper

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Message-Id: <20220831181210.2695080-15-paulmck@kernel.org>
Date:   Wed, 31 Aug 2022 11:12:00 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 15/25] rcu-tasks: Remove grace-period fast-path rcu-tasks helper

Now that the grace-period fast path can only happen during the
pre-scheduler portion of early boot, this fast path can no longer block
run-time RCU Tasks and RCU Tasks Trace grace periods.  This commit
therefore removes the conditional cond_resched_tasks_rcu_qs() invocation.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/tree.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 03b089184b37e..0ff7d5eaa3761 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3492,8 +3492,6 @@ void synchronize_rcu(void)
 		// which allows reuse of ->gp_seq_polled_snap.
 		rcu_poll_gp_seq_start_unlocked(&rcu_state.gp_seq_polled_snap);
 		rcu_poll_gp_seq_end_unlocked(&rcu_state.gp_seq_polled_snap);
-		if (rcu_init_invoked())
-			cond_resched_tasks_rcu_qs();
 		return;  // Context allows vacuous grace periods.
 	}
 	if (rcu_gp_is_expedited())
-- 
2.31.1.189.g2e36527f23