linux-kernel - Re: [PATCH v2 1/2] Return a value from printk

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Date:	Fri, 19 Sep 2014 13:21:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Omar Sandoval <osandov@...ndov.com>
Cc:	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	linux-btrfs@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Return a value from printk_ratelimited

On Fri, 19 Sep 2014 02:01:29 -0700
Omar Sandoval <osandov@...ndov.com> wrote:

> printk returns an integer; there's no reason for printk_ratelimited to swallow
> it.
> 
> Signed-off-by: Omar Sandoval <osandov@...ndov.com>
> ---
>  include/linux/printk.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index d78125f..67534bc 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -343,12 +343,14 @@ extern asmlinkage void dump_stack(void) __cold;
>  #ifdef CONFIG_PRINTK
>  #define printk_ratelimited(fmt, ...)					\
>  ({									\
> +	int __ret = 0;							\

My only issues is with the "__ret" name.

It's not really unique enough. If something else uses __ret and does

  printk_ratelimit("some fmt string %d\n", __ret);

This will not print the right value.

printk_ratelimit can be used almost anywhere thus using a really unique
value may be worth while here.

What about:

  int ______r

?

-- Steve

>  	static DEFINE_RATELIMIT_STATE(_rs,				\
>  				      DEFAULT_RATELIMIT_INTERVAL,	\
>  				      DEFAULT_RATELIMIT_BURST);		\
>  									\
>  	if (__ratelimit(&_rs))						\
> -		printk(fmt, ##__VA_ARGS__);				\
> +		__ret = printk(fmt, ##__VA_ARGS__);			\
> +	__ret;								\
>  })
>  #else
>  #define printk_ratelimited(fmt, ...)					\

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