linux-kernel - Re: [PATCH tip/core/rcu 3/6] rcu: Test srcu

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Date:	Fri, 15 Jun 2012 13:25:11 -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 3/6] rcu: Test srcu_barrier() from
 rcutorture test suite

On Fri, Jun 15, 2012 at 11:57:51AM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> SRCU now has a call_srcu() and an srcu_barrier(), but rcutorture does
> not test srcu_barrier().  This commit adds the machinery to allow
> rcutorture's existing rcu_barrier() tests to apply to SRCU.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

This commit message suggests that the commit only adds support for
testing srcu_barrier, but it adds both call_srcu and srcu_barrier.  You
might want to wordsmith it a bit:

SRCU now has a call_srcu() and an srcu_barrier(), but rcutorture does
not test them.  This commit adds the machinery to allow rcutorture's
existing tests for call_rcu() and rcu_barrier() to apply to the SRCU
equivalents.

With that change:

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

> ---
>  kernel/rcutorture.c |   15 +++++++++++++--
>  1 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
> index 9850479..7b6935e 100644
> --- a/kernel/rcutorture.c
> +++ b/kernel/rcutorture.c
> @@ -635,6 +635,17 @@ static void srcu_torture_synchronize(void)
>  	synchronize_srcu(&srcu_ctl);
>  }
>  
> +static void srcu_torture_call(struct rcu_head *head,
> +			      void (*func)(struct rcu_head *head))
> +{
> +	call_srcu(&srcu_ctl, head, func);
> +}
> +
> +static void srcu_torture_barrier(void)
> +{
> +	srcu_barrier(&srcu_ctl);
> +}
> +
>  static int srcu_torture_stats(char *page)
>  {
>  	int cnt = 0;
> @@ -661,8 +672,8 @@ static struct rcu_torture_ops srcu_ops = {
>  	.completed	= srcu_torture_completed,
>  	.deferred_free	= srcu_torture_deferred_free,
>  	.sync		= srcu_torture_synchronize,
> -	.call		= NULL,
> -	.cb_barrier	= NULL,
> +	.call		= srcu_torture_call,
> +	.cb_barrier	= srcu_torture_barrier,
>  	.stats		= srcu_torture_stats,
>  	.name		= "srcu"
>  };
> -- 
> 1.7.8
> 
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