linux-kernel - Re: [PATCH tip/core/rcu 5/6] rcu: add rnp->blocked

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Message-ID: <20091014202649.GC2395@feather>
Date:	Wed, 14 Oct 2009 13:26:50 -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, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com, npiggin@...e.de,
	jens.axboe@...cle.com
Subject: Re: [PATCH tip/core/rcu 5/6] rcu: add rnp->blocked_tasks to tracing

On Wed, Oct 14, 2009 at 10:15:58AM -0700, Paul E. McKenney wrote:
> From: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  kernel/rcutree_trace.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
> index 4b31c77..f9d01a3 100644
> --- a/kernel/rcutree_trace.c
> +++ b/kernel/rcutree_trace.c
> @@ -155,12 +155,13 @@ static const struct file_operations rcudata_csv_fops = {
>  
>  static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
>  {
> +	long gpnum;
>  	int level = 0;
>  	struct rcu_node *rnp;
>  
>  	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
>  		      "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld\n",
> -		   rsp->completed, rsp->gpnum, rsp->signaled,
> +		   rsp->completed, gpnum = rsp->gpnum, rsp->signaled,

Please don't hide this or any other assignment in the middle of a print
statement.  Just put it immediately preceeding the statement.

- Josh Triplett
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