linux-kernel - Re: [tip:core/debug] debug: Make CONFIG_EXPERT select CONFIG_DEBUG

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Date:	Mon, 6 Jun 2011 15:09:05 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	sam@...nborg.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/debug] debug: Make CONFIG_EXPERT select
 CONFIG_DEBUG_KERNEL to unhide debug options

On Mon, Jun 06, 2011 at 11:45:04PM +0200, Frederic Weisbecker wrote:
> On Mon, Jun 06, 2011 at 09:39:40PM +0000, tip-bot for Josh Triplett wrote:
> > Commit-ID:  2458073da04571182748aa4289630dca52ba63cc
> > Gitweb:     http://git.kernel.org/tip/2458073da04571182748aa4289630dca52ba63cc
> > Author:     Josh Triplett <josh@...htriplett.org>
> > AuthorDate: Mon, 6 Jun 2011 09:51:30 -0700
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Mon, 6 Jun 2011 19:30:01 +0200
> > 
> > debug: Make CONFIG_EXPERT select CONFIG_DEBUG_KERNEL to unhide debug options
> > 
> > Several debugging options currently default to y, such as
> > CONFIG_DEBUG_BUGVERBOSE and CONFIG_DEBUG_RODATA.
> > 
> > Embedded users might want to turn those options off to save space;
> > however, turning them off requires turning on CONFIG_DEBUG_KERNEL to
> > unhide them.  Since CONFIG_DEBUG_KERNEL exists specifically to
> > unhide debugging options, and CONFIG_EXPERT exists specifically
> > to unhide options potentially needed by experts and/or embedded
> > users, make CONFIG_EXPERT automatically imply CONFIG_DEBUG_KERNEL.
> > 
> > Change various debugging options to only reference DEBUG_KERNEL,
> > not EXPERT.
> > 
> > Note that DEBUG_MEMORY_INIT defaulted to !EXPERT, which seemed
> > wrong, since EXPERT should not directly affect anything except
> > the availability of other options.  (And EXPERT definitely
> > shouldn't mean "implicitly turn off default safety features".)
> > 
> > Change it to default to y, which means that turning on EXPERT
> > does not automatically disable it, but will provide the option
> > to disable it.
> > 
> > Signed-off-by: Josh Triplett <josh@...htriplett.org>
> > Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> 
> No, Nacked actually. I'm fine with the v2 that only changed
> the EXPERT config to imply DEBUG_KERNEL. But all the other
> changes here need to be revised, as I outlined in the thread.

Fixed in v4; please replace the patch in tip with that.

- Josh Triplett
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