linux-kernel - Re: [PATCH] rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT

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Date:	Mon, 01 Aug 2011 22:44:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	eric.dumazet@...il.com, paulmck@...ux.vnet.ibm.com,
	mchan@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: convert uses of rcu_assign_pointer(x, NULL) to
 RCU_INIT_POINTER

From: Stephen Hemminger <shemminger@...tta.com>
Date: Mon, 1 Aug 2011 09:19:00 -0700

> When assigning a NULL value to an RCU protected pointer, no barrier
> is needed. The rcu_assign_pointer, used to handle that but will soon
> change to not handle the special case.
> 
> Convert all rcu_assign_pointer of NULL value.
> 
> //smpl
> @@ expression P; @@
> 
> - rcu_assign_pointer(P, NULL)
> + RCU_INIT_POINTER(P, NULL)
> 
> // </smpl>
> 
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

Acked-by: David S. Miller <davem@...emloft.net>
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