linux-kernel - Re: Please revert "debug: Make CONFIG_EXPERT select CONFIG_DEBUG

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Message-ID: <20111021092249.GG9819@localhost.pp.htv.fi>
Date:	Fri, 21 Oct 2011 12:22:49 +0300
From:	Adrian Bunk <bunk@...sta.de>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Josh Triplett <josh@...htriplett.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: Please revert "debug: Make CONFIG_EXPERT select
 CONFIG_DEBUG_KERNEL to unhide debug options"

On Fri, Oct 21, 2011 at 10:19:29AM +0200, Michal Marek wrote:
> On 20.10.2011 23:41, Adrian Bunk wrote:
> > Ingo, would you accept if I would go through the Kconfig files and 
> > monitor future changes to Kconfig files in the kernel (or if Michal does 
> > it, I don't insist that it has to be me if someone else wants to do it)?
> 
> What kind of changes do you have in mind? Sorry, I haven't followed the
> whole thread.

Checking the correctness and making things more robust.

An example:

config KVM
        tristate "Kernel-based Virtual Machine (KVM) support"
	...
        # for TASKSTATS/TASK_DELAY_ACCT:
        depends on NET
	...
        select TASKSTATS
        select TASK_DELAY_ACCT

That breaks if anyone touches the dependencies of TASKSTATS
or TASK_DELAY_ACCT.

It should be solved better, my first thought would be introducing
something like a TASK_DELAY_ACCT_AVAILABLE variable.

(I am also not sure if what KVM is doing here is the best possible
 solution or if there's an in-kernel interface that should be factored
 out instead - but that is a secondary discussion that might start when 
 you look at such cross-subsystem select's.)

> Michal

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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