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authorChristine Spang <christine.spang@oracle.com>2013-03-04 17:02:59 -0500
committerTakashi Iwai <tiwai@suse.de>2013-03-11 09:33:34 +0100
commitd5702162f85526319c848c667df49ee1754dccef (patch)
tree15285b7b5a202a7f5629080fc3224a358378d0f1 /Documentation/DocBook
parent8ba955cef30921417dffba901a8af5a2662a1dec (diff)
downloadop-kernel-dev-d5702162f85526319c848c667df49ee1754dccef.zip
op-kernel-dev-d5702162f85526319c848c667df49ee1754dccef.tar.gz
ALSA: Make snd_BUG_ON() always evaluate and return the conditional expression
Having snd_BUG_ON() only evaluate its conditional when CONFIG_SND_DEBUG is set leads to frequent bugs, since other similar macros in the kernel have different behavior. Let's make snd_BUG_ON() act like those macros so it will stop being accidentally misused. Signed-off-by: Christine Spang <christine.spang@oracle.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/writing-an-alsa-driver.tmpl12
1 files changed, 5 insertions, 7 deletions
diff --git a/Documentation/DocBook/writing-an-alsa-driver.tmpl b/Documentation/DocBook/writing-an-alsa-driver.tmpl
index bd6fee2..06741e9 100644
--- a/Documentation/DocBook/writing-an-alsa-driver.tmpl
+++ b/Documentation/DocBook/writing-an-alsa-driver.tmpl
@@ -6164,14 +6164,12 @@ struct _snd_pcm_runtime {
<para>
The macro takes an conditional expression to evaluate.
- When <constant>CONFIG_SND_DEBUG</constant>, is set, the
- expression is actually evaluated. If it's non-zero, it shows
- the warning message such as
+ When <constant>CONFIG_SND_DEBUG</constant>, is set, if the
+ expression is non-zero, it shows the warning message such as
<computeroutput>BUG? (xxx)</computeroutput>
- normally followed by stack trace. It returns the evaluated
- value.
- When no <constant>CONFIG_SND_DEBUG</constant> is set, this
- macro always returns zero.
+ normally followed by stack trace.
+
+ In both cases it returns the evaluated value.
</para>
</section>
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