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

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Date:	Mon, 18 Aug 2014 15:32:34 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	infinipath@...el.com, roland@...nel.org, sean.hefty@...el.com,
	hal.rosenstock@...il.com, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] qib_keys: Replace rcu_assign_pointer() with
 RCU_INIT_POINTER()

The uses of "rcu_assign_pointer()" are NULLing out the pointers.
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/hw/qib/qib_keys.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib_keys.c b/drivers/infiniband/hw/qib/qib_keys.c
index 3b9afcc..ad843c7 100644
--- a/drivers/infiniband/hw/qib/qib_keys.c
+++ b/drivers/infiniband/hw/qib/qib_keys.c
@@ -122,10 +122,10 @@ void qib_free_lkey(struct qib_mregion *mr)
 	if (!mr->lkey_published)
 		goto out;
 	if (lkey == 0)
-		rcu_assign_pointer(dev->dma_mr, NULL);
+		RCU_INIT_POINTER(dev->dma_mr, NULL);
 	else {
 		r = lkey >> (32 - ib_qib_lkey_table_size);
-		rcu_assign_pointer(rkt->table[r], NULL);
+		RCU_INIT_POINTER(rkt->table[r], NULL);
 	}
 	qib_put_mr(mr);
 	mr->lkey_published = 0;
-- 
1.9.1

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