linux-kernel - Re: [PATCH 3.11-rc5 1/2] ALSA: pcm: Add snd_printd

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Date:	Mon, 19 Aug 2013 15:49:39 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Jaroslav Kysela <perex@...ex.cz>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Yacine Belkadi <yacine.belkadi.1@...il.com>
Subject: Re: [PATCH 3.11-rc5 1/2] ALSA: pcm: Add snd_printd_ratelimit()

At Fri, 16 Aug 2013 11:18:59 -0600,
Tim Gardner wrote:
> 
> Direct calls to printk_limit() will emit log noise even when CONFIG_SND_DEBUG is not
> defined. Add a wrapper macro around printk_limit() that is conditionally defined by
> CONFIG_SND_DEBUG.
> 
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.de>
> Cc: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Cc: Lars-Peter Clausen <lars@...afoo.de>
> Cc: Yacine Belkadi <yacine.belkadi.1@...il.com>
> Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> ---
> 
> checkpatch is moaning about the use of printk_ratelimit(), but
> printk_ratelimited() seems like overkill for a debug feature.
> 
> WARNING: Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit
> #38: FILE: include/sound/core.h:382:
> +#define snd_printd_ratelimit() printk_ratelimit()

Thanks, applied both patches now.
But it's no real bug, so I postpone this for 3.12 inclusion.


Takashi


> 
>  include/sound/core.h |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/sound/core.h b/include/sound/core.h
> index c586617..2a14f1f 100644
> --- a/include/sound/core.h
> +++ b/include/sound/core.h
> @@ -27,6 +27,7 @@
>  #include <linux/rwsem.h>		/* struct rw_semaphore */
>  #include <linux/pm.h>			/* pm_message_t */
>  #include <linux/stringify.h>
> +#include <linux/printk.h>
>  
>  /* number of supported soundcards */
>  #ifdef CONFIG_SND_DYNAMIC_MINORS
> @@ -376,6 +377,11 @@ void __snd_printk(unsigned int level, const char *file, int line,
>  #define snd_BUG()		WARN(1, "BUG?\n")
>  
>  /**
> + * Suppress high rates of output when CONFIG_SND_DEBUG is enabled.
> + */
> +#define snd_printd_ratelimit() printk_ratelimit()
> +
> +/**
>   * snd_BUG_ON - debugging check macro
>   * @cond: condition to evaluate
>   *
> @@ -398,6 +404,8 @@ static inline void _snd_printd(int level, const char *format, ...) {}
>  	unlikely(__ret_warn_on); \
>  })
>  
> +static inline bool snd_printd_ratelimit(void) { return false; }
> +
>  #endif /* CONFIG_SND_DEBUG */
>  
>  #ifdef CONFIG_SND_DEBUG_VERBOSE
> -- 
> 1.7.9.5
> 
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