[alsa-devel] [PATCH] ALSA: have snd_BUG_ON() always refer to arguments
tiwai at suse.de
Fri Nov 7 10:56:38 CET 2008
At Fri, 7 Nov 2008 04:30:43 -0500,
Mike Frysinger wrote:
> On Fri, Nov 7, 2008 at 03:22, Takashi Iwai wrote:
> > At Fri, 7 Nov 2008 03:05:56 -0500, Mike Frysinger wrote:
> >> On Fri, Nov 7, 2008 at 03:03, Takashi Iwai wrote:
> >> > At Fri, 7 Nov 2008 02:57:40 -0500, Mike Frysinger wrote:
> >> >> On Fri, Nov 7, 2008 at 02:38, Takashi Iwai wrote:
> >> >> > At Fri, 7 Nov 2008 02:29:25 -0500, Mike Frysinger wrote:
> >> >> >> it also breaks
> >> >> >> valid C code if there were side effects in the (cond) as any other
> >> >> >> macro which does not properly utilize every argument exactly once.
> >> >> >
> >> >> > BTW, what do you mean this exactly?
> >> >>
> >> >> any potent statement. such as assignment or pre/post increment/decrement or ...
> >> >
> >> > Well, in that case, such a code itself is buggy :)
> >> i'm not advocating doing this sort of thing, i'm saying that
> >> functions/macros should be written correctly so as to not break
> >> standard C behavior. a guy developing a codec driver could waste a
> >> lot of time because of this sort of thing.
> > Well, no, it's a clear bug of the driver.
> > A macro that ignores arguments is normal. Or do you think assert()
> > isn't a part of "standard" C ? :)
> we arent talking about assert() here nor are we talking about assert()
> behavior, but i would say it was a poor decision. the fact that it's
> called snd_BUG_ON() instead of snd_WARN_ON() is also a bit broken imo.
> BUG() kills the kernel while WARN() complains, and snd_BUG_ON() is
> clearly in the latter category.
Right, that's a bit confusing. It came because we had already
snd_BUG() macro. I took snd_BUG_ON() from the analogy of snd_BUG().
> that said, you could just define snd_BUG_ON() in terms of WARN_ON()
> all the time:
Hm, this looks a good alternative, too.
Though, this was already fixed on my git tree in another way...
> #ifdef CONFIG_SND_DEBUG
> # define SND_DEBUG 1
> # define SND_DEBUG 0
> #define snd_BUG() WARN(SND_DEBUG, "BUG?\n")
> #define snd_BUG_ON(cond) WARN(SND_DEBUG && (cond), "BUG? (%s)\n",
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