Date: Mon, 2 Aug 2010 09:47:06 -0400
From: Jason Baron <jbaron@redhat.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Greg KH <gregkh@suse.de>, Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, trenn@suse.de
Subject: Re: Boot-time dynamic debugging?
Message-ID: <20100802134705.GA2836@redhat.com>
References: <AANLkTiksVFpU+3iek4-TM2q=wSDGpW_nJAr8XtHT06LE@mail.gmail.com>
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On Sun, Aug 01, 2010 at 03:10:40PM +0300, Pekka Enberg wrote:
> Hi!
> 
> Commit 346e15beb5343c2eb8216d820f2ed8f150822b08 ("driver core: basic
> infrastructure for per-module dynamic debug messages") removed
> "dynamic_printk" kernel parameter from the dynamic debugging subsystem
> (and forgot to update Documentation/kernel-parameters.txt). How can I
> use the new subsystem for enabling boot-time dev_dbg() calls for
> non-modular kernels?
> 
>                         Pekka

Hi Pekka,

Right now, you can not enable them dynamically from the boot command
line (only via the debugfs file). However, Thomas Renninger, has posted
a series to add back the boot-time functionality, see:

Subject:    [patch 0/3] Dynamic Debug providing early boot debug messages via
boot parameter
http://marc.info/?l=linux-kernel&m=127970474426120&w=2

So I intend to queue those up for 2.6.36, and also update the
documentation.

thanks,

-Jason


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