linux-kernel - Re: [PATCH rcu] use new nesting value for rcu_dyntick trace in rcu_eqs_enter

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Message-ID: <20121127151831.GU2474@linux.vnet.ibm.com>
Date:	Tue, 27 Nov 2012 07:18:32 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>
Cc:	linux-next list <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, dipankar@...ibm.com
Subject: Re: [PATCH rcu] use new nesting value for rcu_dyntick trace in
 rcu_eqs_enter_common

On Tue, Nov 27, 2012 at 01:58:27PM +0800, Li Zhong wrote:
> This patch uses the real new value of dynticks_nesting instead of 0 in
> rcu_eqs_enter_common(). 
> 
> Signed-off-by: Li Zhong <zhong@...ux.vnet.ibm.com>

Good catch!  Queued for 3.9.

							Thanx, Paul

> ---
>  kernel/rcutree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 7733eb5..6b7e314 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -339,7 +339,7 @@ static struct rcu_node *rcu_get_root(struct rcu_state *rsp)
>  static void rcu_eqs_enter_common(struct rcu_dynticks *rdtp, long long oldval,
>  				bool user)
>  {
> -	trace_rcu_dyntick("Start", oldval, 0);
> +	trace_rcu_dyntick("Start", oldval, rdtp->dynticks_nesting);
>  	if (!user && !is_idle_task(current)) {
>  		struct task_struct *idle = idle_task(smp_processor_id());
> 
> -- 
> 1.7.11.4
> 

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