linux-kernel - Re: [PATCH tip/core/rcu 06/14] rcu: Remove return value from RCU_INIT

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Message-ID: <20120615205012.GJ31184@leaf>
Date:	Fri, 15 Jun 2012 13:50:12 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 06/14] rcu: Remove return value from
 RCU_INIT_POINTER()

On Fri, Jun 15, 2012 at 01:13:07PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> The return value from RCU_INIT_POINTER() is not used, and using it
> would be quite ugly, for example:
> 
> 	q = RCU_INIT_POINTER(global_p, p);
> 
> To prevent this sort of ugliness from appearing, this commit wraps
> RCU_INIT_POINTER() in a do-while loop.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

>  include/linux/rcupdate.h |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> index eb92c21..f2cca02 100644
> --- a/include/linux/rcupdate.h
> +++ b/include/linux/rcupdate.h
> @@ -904,7 +904,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
>   * the reader-accessible portions of the linked structure.
>   */
>  #define RCU_INIT_POINTER(p, v) \
> -		p = (typeof(*v) __force __rcu *)(v)
> +	do { \
> +		p = (typeof(*v) __force __rcu *)(v); \
> +	} while (0)
>  
>  /**
>   * INIT_RCU_POINTER() - statically initialize an RCU protected pointer
> -- 
> 1.7.8
> 
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