linux-kernel - [PATCH] ipoib: Replace rcu_assign_pointer() with RCU_INIT

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Date:	Mon, 18 Aug 2014 17:23:33 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	roland@...nel.org, sean.hefty@...el.com, hal.rosenstock@...il.com,
	erezsh@...lanox.com, mschmidt@...hat.com, ogerlitz@...lanox.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] ipoib: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

The use of "rcu_assign_pointer()" is NULLing out the pointer.
According to RCU_INIT_POINTER()'s block comment:
"1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

The following Coccinelle semantic patch was used:
@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 5786a78..64cd5b5 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1229,7 +1229,7 @@ static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
 	}
 
 free_htbl:
-	rcu_assign_pointer(ntbl->htbl, NULL);
+	RCU_INIT_POINTER(ntbl->htbl, NULL);
 	call_rcu(&htbl->rcu, neigh_hash_free_rcu);
 
 out_unlock:
-- 
1.9.1

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