linux-kernel - [PATCH] block: Use RCU_INIT

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Message-Id: <1395520218-2902-1-git-send-email-monamagarwal123@gmail.com>
Date:	Sun, 23 Mar 2014 02:00:18 +0530
From:	Monam Agarwal <monamagarwal123@...il.com>
To:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: [PATCH] block: Use RCU_INIT_POINTER(x, NULL) in genhd.c

This patch replaces rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a structure       
is carried out before storing a pointer to that structure. 
And in the case of the NULL pointer, there is no structure to initialize. 
So, rcu_assign_pointer(p, NULL) can be safely converted to RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@...il.com>
---
 block/genhd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index 791f419..3aec057 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1045,7 +1045,7 @@ static void disk_replace_part_tbl(struct gendisk *disk,
 	rcu_assign_pointer(disk->part_tbl, new_ptbl);
 
 	if (old_ptbl) {
-		rcu_assign_pointer(old_ptbl->last_lookup, NULL);
+		RCU_INIT_POINTER(old_ptbl->last_lookup, NULL);
 		kfree_rcu(old_ptbl, rcu_head);
 	}
 }
-- 
1.7.9.5

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