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

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Date:	Mon, 6 Jun 2011 23:45:04 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	sam@...nborg.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, josh@...htriplett.org, mingo@...e.hu
Cc:	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 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.
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