On Tue, May 10, 2011 at 10:42 AM, Geert Uytterhoeven
<[email protected]> wrote:
> On Tue, May 10, 2011 at 11:20, Niels de Vos <[email protected]> wrote:
>> When DBG() is used in a simple if-else, the resulting code path
>> currently depends on the definition of DBG(). Inserting the statement in
>> a "do { ... } while (0)" prevents this possible misuse.
>>
>> Signed-off-by: Niels de Vos <[email protected]>
>
>> --- a/drivers/video/omap2/omapfb/omapfb.h
>> +++ b/drivers/video/omap2/omapfb/omapfb.h
>> @@ -34,8 +34,10 @@
>> #ifdef DEBUG
>> extern unsigned int omapfb_debug;
>> #define DBG(format, ...) \
>> - if (omapfb_debug) \
>> - printk(KERN_DEBUG "OMAPFB: " format, ## __VA_ARGS__)
>> + do { \
>> + if (omapfb_debug) \
>> + printk(KERN_DEBUG "OMAPFB: " format, ##
>> __VA_ARGS__); \
>> + while (0)
>
> Where's the closing '}'?
Good catch! That's in a "fixup!" that I forgot to squash :-/
I'll post an update version in a bit.
>> #else
>> #define DBG(format, ...)
>
> BTW, no printf()-style format checking here.
>
>> #endif
>
> What about using the standard pr_debug()/dev_dbg() instead?
> With dynamic debug, it can be enabled at run time.
> As a bonus, you get printf()-style format checking if debugging is disabled.
I think removing DBG() and the omapfb_debug module-parameter is surely
a good thing. Unfortunately DBG() is used quite a bit in the code and
replacing them 'll take some more time. I don't know yet when I find
some time to do and test that.
Thanks for the pointers,
Niels
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --
> [email protected]
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like
> that.
> -- Linus Torvalds
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