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ALSA: Document debug macros

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Add descriptions of snd_BUG() and snd_BUG_ON().
Also fixed a typo in the comment of snd_printk(), too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-11-07 09:37:22 +01:00
parent 945eed02cd
commit f66fcedc84
1 changed files with 23 additions and 1 deletions
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24
include/sound/core.h
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@ -356,7 +356,7 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...)
* snd_printk - printk wrapper
* @fmt: format string
*
* Works like print() but prints the file and the line of the caller
* Works like printk() but prints the file and the line of the caller
* when configured with CONFIG_SND_VERBOSE_PRINTK.
*/
#define snd_printk(fmt, args...) \
@ -383,7 +383,29 @@ void snd_verbose_printd(const char *file, int line, const char *format, ...)
printk(fmt ,##args)
#endif
/**
* snd_BUG - give a BUG warning message and stack trace
*
* Calls WARN() if CONFIG_SND_DEBUG is set.
* Ignored when CONFIG_SND_DEBUG is not set.
*/
#define snd_BUG() WARN(1, "BUG?\n")
/**
* snd_BUG_ON - debugging check macro
* @cond: condition to evaluate
*
* When CONFIG_SND_DEBUG is set, this macro evaluates the given condition,
* and call WARN() and returns the value if it's non-zero.
*
* When CONFIG_SND_DEBUG is not set, this just returns zero, and the given
* condition is ignored.
*
* NOTE: the argument won't be evaluated at all when CONFIG_SND_DEBUG=n.
* Thus, don't put any statement that influences on the code behavior,
* such as pre/post increment, to the argument of this macro.
* If you want to evaluate and give a warning, use standard WARN_ON().
*/
#define snd_BUG_ON(cond) WARN((cond), "BUG? (%s)\n", __stringify(cond))
#else /* !CONFIG_SND_DEBUG */