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

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Date:	Fri, 22 Aug 2014 16:57:19 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	viro@...iv.linux.org.uk, bcrl@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] fs: aio: 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>
---
 fs/aio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/aio.c b/fs/aio.c
index 4f078c0..81f7f3f 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -802,7 +802,7 @@ void exit_aio(struct mm_struct *mm)
 		do {
 			if (!table || i >= table->nr) {
 				rcu_read_unlock();
-				rcu_assign_pointer(mm->ioctx_table, NULL);
+				RCU_INIT_POINTER(mm->ioctx_table, NULL);
 				if (table)
 					kfree(table);
 				return;
-- 
1.9.1

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