linux-kernel - Re: [PATCH 4/5] sound: update snd

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Date:	Fri, 03 Oct 2008 11:10:09 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 4/5] sound: update snd_assert macro

At Thu, 02 Oct 2008 11:05:33 -0400,
Steven Rostedt wrote:
> 
> One user of the snd_assert macro calls a goto and the compiler
> complains that the label is not used when the snd_assert is
> not set.
> 
> This patch makes snd_assert more robust when not defined to
> let the compiler know about arguments when not in use.

This issue was already fixed differently in the recent ALSA tree
(thus in linux-next tree as well).

thanks,

Takashi


> 
> CC: Jaroslav Kysela <perex@...ex.cz>
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> ---
>  include/sound/core.h |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> Index: linux-compile.git/include/sound/core.h
> ===================================================================
> --- linux-compile.git.orig/include/sound/core.h	2008-07-27 09:26:33.000000000 -0400
> +++ linux-compile.git/include/sound/core.h	2008-10-02 10:00:57.000000000 -0400
> @@ -407,7 +407,13 @@ void snd_verbose_printd(const char *file
>  #else /* !CONFIG_SND_DEBUG */
>  
>  #define snd_printd(fmt, args...)	/* nothing */
> -#define snd_assert(expr, args...)	(void)(expr)
> +/* Keep the compiler happy by showing the expr and args */
> +#define snd_assert(expr, args...)	do {	\
> +	if (0) {				\
> +		(void)(expr);			\
> +		args;				\
> +	}					\
> +} while(0)
>  #define snd_BUG()			/* nothing */
>  
>  #endif /* CONFIG_SND_DEBUG */
> 
> -- 
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