linux-kernel - Re: [RFC PATCH] rcu: Add sparse check for RCU_INIT

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Message-ID: <20140925181024.GA9360@cloud>
Date:	Thu, 25 Sep 2014 11:10:24 -0700
From:	josh@...htriplett.org
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"open list:READ-COPY UPDATE..." <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] rcu: Add sparse check for RCU_INIT_POINTER()

On Thu, Sep 25, 2014 at 02:03:34PM -0400, Pranith Kumar wrote:
> Add a sparse check when RCU_INIT_POINTER() is used to assign a non __rcu
> annotated pointer. 
> 
> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>

Have you checked if this introduces a significant number of new warnings
in the kernel?

If not:
Reviewed-by: Josh Triplett <josh@...htriplett.org>

>  include/linux/rcupdate.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> index a4a819f..a033d8b 100644
> --- a/include/linux/rcupdate.h
> +++ b/include/linux/rcupdate.h
> @@ -1047,6 +1047,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
>   */
>  #define RCU_INIT_POINTER(p, v) \
>  	do { \
> +		rcu_dereference_sparse(p, __rcu); \
>  		p = RCU_INITIALIZER(v); \
>  	} while (0)
>  
> -- 
> 2.1.0
> 
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