linux-kernel - Re: [patch 0/4] make pr

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Message-ID: <Pine.LNX.4.64.0802092320380.6917@fbirervta.pbzchgretzou.qr>
Date:	Sat, 9 Feb 2008 23:21:58 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jason Baron <jbaron@...hat.com>
cc:	Joe Perches <joe@...ches.com>, mathieu.desnoyers@...ymtl.ca,
	akpm@...ux-foundation.org, mingo@...e.hu, fche@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 0/4] make pr_debug() dynamic


On Feb 8 2008 10:52, Jason Baron wrote:
>On Thu, Feb 07, 2008 at 02:42:14PM -0800, Joe Perches wrote:
>> On Thu, 2008-02-07 at 16:03 -0500, Jason Baron wrote:
>> > make the pr_debug() function dependent upon the new immediate infrastruture.
>> 
>> What's wrong with klogd -c 8 or equivalent?
>
>Setting the loglevel higher, will not make pr_debug() calls visible. The only
>way to make them visible right now, is by re-compiling the kernel.

pr_debug() was IMHO meant to be a compile-time optimization
to throw out debug messages most people do not want.

If you want to switch on/off debugging messages, use
printk(KERN_DEBUG) [with klogd -c something] and not pr_debug!
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