linux-kernel - Re: ehci dynamic debug problem

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Message-ID: <20120413145728.GA22240@sig21.net>
Date:	Fri, 13 Apr 2012 16:57:28 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: ehci dynamic debug problem

On Fri, Apr 13, 2012 at 10:35:59AM -0400, Alan Stern wrote:
> On Fri, 13 Apr 2012, Johannes Stezenbach wrote:
> > 
> > Does dynamic debug offer an "is the message two lines below enabled" test?
> > Simply changing the "#ifdef DEBUG" for dbg_port_buf()
> > to "#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)"
> > is probably not acceptable due to the overhead of dbg_port_buf()?
> 
> I don't understand your question.  Doesn't dbg_port_buf need to be 
> defined whenever dynamic debugging is enabled?
> 
> Alternatively, the definition of dbg_port_buf (and related routines) in 
> the !defined(DEBUG) case could be changed; you could add
> 
> 	buf[0] = 0;
> 
> That way you wouldn't get garbage out, although you wouldn't get 
> anything useful either.

The ideal solution I'm looking for gives useful output
when dynamic debugging is enabled for ehci, but does no
useless string formatting when CONFIG_DYNAMIC_DEBUG is y
but the dynamic debug for ehci is disabled.


Thanks,
Johannes
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