linux-kernel - Re: About multiple queries to control using $DBGMT/dynamic

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Date:	Fri, 24 Aug 2012 14:19:40 -0400
From:	jbaron <jbaron@...hat.com>
To:	Jianpeng Ma <majianpeng@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, jim.cromie@...il.com
Subject: Re: About multiple queries to control using
 $DBGMT/dynamic_debug/control

On Wed, Aug 22, 2012 at 07:42:14PM +0800, Jianpeng Ma wrote:
> Hi,
> 	I used the $DBGMT/dynamic_debug/control to control printing debuginfo.But When i wote multiple queries which has at least one didn't match,
> the result is ok which no error can return.
> 	So i think i wrote correct queries.But until using dmesg, i only found error.
> 	And if parm verbose of dynamic_debug is zero, i can't find the result by dmesg.
> 	So i think it's not convenient.
> 	If it did not found any query,it should return error.
> 
> Thanks!

Hi,

You can verify what changes have occured by looking in the
$DBGMT/dynamic_debug/control file, and verifying what statements have
been matched. For example, we add a 'p' when printing is enabled.
Does that address your concern?

As these debug statements come and go, I think I'd prefer not to error
out in this case.

Thanks,

-Jason
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