linux-kernel - Re: [PATCH tip/core/rcu 08/15] rcu: Apply for_each_rcu_flavor() to increment_cpu_stall

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Message-ID: <20120831181516.GF4259@jtriplet-mobl1>
Date:	Fri, 31 Aug 2012 11:15:16 -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, sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 08/15] rcu: Apply for_each_rcu_flavor() to
 increment_cpu_stall_ticks()

On Thu, Aug 30, 2012 at 11:56:21AM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> The increment_cpu_stall_ticks() function listed each RCU flavor
> explicitly, with an ifdef to handle preemptible RCU.  This commit
> therefore applies for_each_rcu_flavor() to save a line of code.

And also mysteriously changes __get_cpu_var to __this_cpu_var without
documenting that (or the reason for it) in the commit message. :)

> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  kernel/rcutree_plugin.h |    9 ++++-----
>  1 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
> index 3ea60c9..139a803 100644
> --- a/kernel/rcutree_plugin.h
> +++ b/kernel/rcutree_plugin.h
> @@ -2196,11 +2196,10 @@ static void zero_cpu_stall_ticks(struct rcu_data *rdp)
>  /* Increment ->ticks_this_gp for all flavors of RCU. */
>  static void increment_cpu_stall_ticks(void)
>  {
> -	__get_cpu_var(rcu_sched_data).ticks_this_gp++;
> -	__get_cpu_var(rcu_bh_data).ticks_this_gp++;
> -#ifdef CONFIG_TREE_PREEMPT_RCU
> -	__get_cpu_var(rcu_preempt_data).ticks_this_gp++;
> -#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
> +	struct rcu_state *rsp;
> +
> +	for_each_rcu_flavor(rsp)
> +		__this_cpu_ptr(rsp->rda)->ticks_this_gp++;
>  }
>  
>  #else /* #ifdef CONFIG_RCU_CPU_STALL_INFO */
> -- 
> 1.7.8
> 
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