linux-kernel - Re: [PATCH] DEBUG_KOBJECT vs. DYNAMIC_PRINTK

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Message-ID: <20081203201203.GA3128@redhat.com>
Date:	Wed, 3 Dec 2008 15:12:03 -0500
From:	Jason Baron <jbaron@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Greg K-H <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] DEBUG_KOBJECT vs. DYNAMIC_PRINTK_DEBUG

On Tue, Dec 02, 2008 at 02:52:51PM +0100, Cornelia Huck wrote:
> DEBUG_KOBJECT has no effect when DYNAMIC_PRINTK_DEBUG is set
> (and you can get the messages via that feature), so let's make
> it depend on !DYNAMIC_PRINTK_DEBUG.
> 

indeed. you raise the more general question of what do if both 'DEBUG'
and 'CONFIG_DYNAMIC_PRINTK_DEBUG' are set for a file? I think that in
general the 'DEBUG' should take precedence, as you point out. However, I
think we should fix this by reshuffling the logic in
include/linux/kernel.h by doing:

if (DEBUG)
	#define pr_debug printk
elseif (CONFIG_DYNAMIC_PRINTK_DEBUG)
	#define pr_debug dynamic_pr_debug()
else
	#define pr_debug if (0) blah:
endif

make sense? what do you think?

thanks,

-Jason
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