linux-kernel - [PATCH 1/3] rcu: Remove unnecessary condition check in rcu_qsctr

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Date:	Wed, 11 Feb 2015 15:42:37 +0100
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH 1/3] rcu: Remove unnecessary condition check in rcu_qsctr_help()

In cases ->curtail and ->donetail pointers differ ->rcucblist
always points to the beginning of the current list and thus
can not be NULL. Therefore, the check ->rcucblist != NULL is
redundant and could be removed.

Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 kernel/rcu/tiny.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index cc9ceca..d4e7fe5 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -103,8 +103,7 @@ EXPORT_SYMBOL(__rcu_is_watching);
 static int rcu_qsctr_help(struct rcu_ctrlblk *rcp)
 {
 	RCU_TRACE(reset_cpu_stall_ticks(rcp));
-	if (rcp->rcucblist != NULL &&
-	    rcp->donetail != rcp->curtail) {
+	if (rcp->donetail != rcp->curtail) {
 		rcp->donetail = rcp->curtail;
 		return 1;
 	}
-- 
1.8.3.1

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