linux-kernel - [tip: core/rcu] rcu: Remove dead code from rcu_segcblist_insert_pend

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Date:   Tue, 24 Mar 2020 09:16:49 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] rcu: Remove dead code from rcu_segcblist_insert_pend_cbs()

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     57721fd15a02f7df9dad1f3cca27f21e03ee118f
Gitweb:        https://git.kernel.org/tip/57721fd15a02f7df9dad1f3cca27f21e03ee118f
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Wed, 15 Jan 2020 19:17:02 -08:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Thu, 20 Feb 2020 15:58:23 -08:00

rcu: Remove dead code from rcu_segcblist_insert_pend_cbs()

The rcu_segcblist_insert_pend_cbs() function currently (partially)
initializes the rcu_cblist that it pulls callbacks from.  However, all
the resulting stores are dead because all callers pass in the address of
an on-stack cblist that is not used afterwards.  This commit therefore
removes this pointless initialization.

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

diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c
index 426a472..9a0f661 100644
--- a/kernel/rcu/rcu_segcblist.c
+++ b/kernel/rcu/rcu_segcblist.c
@@ -381,8 +381,6 @@ void rcu_segcblist_insert_pend_cbs(struct rcu_segcblist *rsclp,
 		return; /* Nothing to do. */
 	WRITE_ONCE(*rsclp->tails[RCU_NEXT_TAIL], rclp->head);
 	WRITE_ONCE(rsclp->tails[RCU_NEXT_TAIL], rclp->tail);
-	rclp->head = NULL;
-	rclp->tail = &rclp->head;
 }
 
 /*