linux-kernel - Re: CONFIG_MTD_DEBUG vs generic DEBUG support in kernel.h

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Message-ID: <87vdctzjn4.fsf@tac.ki.iif.hu>
Date:	Thu, 18 Mar 2010 17:20:31 +0100
From:	Ferenc Wagner <wferi@...f.hu>
To:	dedekind1@...il.com
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: CONFIG_MTD_DEBUG vs generic DEBUG support in kernel.h

Artem Bityutskiy <dedekind1@...il.com> writes:

> On Tue, 2010-03-16 at 13:55 +0100, Ferenc Wagner wrote:
> 
>> include/linux/mtd/mtd.h contains the following snippet:
>> 
>> #ifdef CONFIG_MTD_DEBUG
>> #define DEBUG(n, args...)                               \
>>         do {                                            \
>>                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
>>                         printk(KERN_INFO args);         \
>>         } while(0)
>> 
>> which conflicts with the generic debugging support in
>> include/linux/kernel.h:
>> 
>> #ifdef DEBUG
>> #define pr_devel(fmt, ...) \
>>         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
>> 
>> (that is, gcc emits redefinition warnings on modules which
>> #define DEBUG on their own and also include mtd.h)
>> Unfortunately, the DEBUG macro is used rather heavily under
>> drivers/mtd.  Should we resolve this somehow or is it better
>> to just live with it?
>
> IMO, this MTD debug stuff is not very useful and could be just killed.

Well, I found the mtdcore debugging somewhat useful.  But anyway,
killing it would be about as much work as renaming the macro, or using
something standard as dev_(v)dbg or pr_debug/devel (btw. what's the
difference?) instead.  I'm willing to do some mechanical work on either
one if you wish.
-- 
Regards,
Feri.
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