linux-kernel - Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string to torture_kthread

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Date:	Wed, 7 May 2014 14:37:36 -0700
From:	josh@...htriplett.org
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 20/45] torture: Include "Stopping" string
 to torture_kthread_stopping()

On Mon, Apr 28, 2014 at 05:25:08PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> Currently, torture_kthread_stopping() prints only the name of the
> kthread that is stopping, which can be unedifying.  This commit therefore
> adds "Stopping" to make things more evident.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Feedback below.

>  kernel/torture.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/torture.c b/kernel/torture.c
> index acc9afc2f26e..f329848c3eee 100644
> --- a/kernel/torture.c
> +++ b/kernel/torture.c
> @@ -674,8 +674,11 @@ EXPORT_SYMBOL_GPL(torture_must_stop_irq);
>   */
>  void torture_kthread_stopping(char *title)
>  {
> +	char buf[128];
> +
> +	snprintf(buf, sizeof(buf), "Stopping %s", title);
>  	if (verbose)
> -		VERBOSE_TOROUT_STRING(title);
> +		VERBOSE_TOROUT_STRING(buf);

This seems like a case where the macro has led to poorer code; rather
than using sprintf into a temporary buffer, this should just print.
Please consider fixing the output macros to allow formats, as the pr_*
macros do.

Also, why do you need "if (verbose)" if the name of the macro has
VERBOSE_ in it; shouldn't that mean it checks verbosity itself?
(Another good reason not to create a unique verbosity level mechanism,
and to use the kernel mechanisms instead.)

>  	while (!kthread_should_stop()) {
>  		torture_shutdown_absorb(title);
>  		schedule_timeout_uninterruptible(1);
> -- 
> 1.8.1.5
> 
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