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	for linux-mtd@lists.infradead.org; Tue, 16 Mar 2010 13:05:57 +0000
Subject: Re: CONFIG_MTD_DEBUG vs generic DEBUG support in kernel.h
From: Artem Bityutskiy <dedekind1@gmail.com>
To: Ferenc Wagner <wferi@niif.hu>
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Date: Tue, 16 Mar 2010 15:05:59 +0200
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On Tue, 2010-03-16 at 13:55 +0100, Ferenc Wagner wrote:
> Hi,
> 
> 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?
> 
> (Please keep me on Cc, I'm not subscribed.)

IMO, this MTD debug stuff is not very useful and could be just killed.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)