linux-kernel - Re: [PATCH 1/4] Dynamic Debug: Introduce global fake module param module.ddebug

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Date:	Fri, 17 Sep 2010 23:52:46 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Jason Baron <jbaron@...hat.com>
Cc:	bjorn.helgaas@...com, gregkh@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Dynamic Debug: Introduce global fake module param module.ddebug - V3

> Hi,
> 
> So i'm wondering if need to support the module.ddebug on the command
> line?
Yep, that would make things a bit easier...
People would e.g. have to use ddebug_query="module pnp +p"  (which 
already is available with the patch that is queued in linux-next)
instead of pnp.ddebug. Not that obvious or say user friendly, though.

> The ddebug_query="module foo +p" format that you introduced does
> the same thing. 
No that does not work for real (not built-in) modules. Give it a try...
The stuff needs to be set up when the module is loaded.
If you have a real module declared as =m
You need to call "module foo +p" when the module gets/got loaded.
But ddebug_query="..." only gets executed once, when
dynamic debug gets set up, far before any module got loaded.
 
> Also, we can't put those large char[] arrays on the kernel stack. They
> probably should be global.
Where exactly, the command line(*args)?

    Thomas
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