linux-kernel - Re: 2.6.21-mm2

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Message-ID: <7574.1178731018@turing-police.cc.vt.edu>
Date:	Wed, 09 May 2007 13:16:58 -0400
From:	Valdis.Kletnieks@...edu
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-mm2 - Kconfig horkage

On Wed, 09 May 2007 10:07:56 PDT, Christoph Lameter said:
> On Wed, 9 May 2007, Valdis.Kletnieks@...edu wrote:
> > 1) Spotted in init/Kconfig:
> > 
> > config SLUB_DEBUG
> >         default y
> >         bool "Enable SLUB debugging support" if EMBEDDED
> >         help
> > 
> > Shouldn't that have an 'default SLUB' or 'if SLUB' or something attached to it?
> 
> Maybe. Is there a problem with SLUB_DEBUG being set if SLUB is not 
> selected?

% egrep 'SL[AU]B' /usr/src/linux-2.6.21-mm2/.config
# CONFIG_SLUB_DEBUG is not set
CONFIG_SLAB=y
# CONFIG_SLUB is not set
# CONFIG_DEBUG_SLAB is not set

Just seemed odd to do a 'make oldconfig' and get prompted for the value, and it
gave a value of 'Y' to a debug  option of a feature that wasn't selected.  :)

It took me a while to convince myself that somebody hadn't changed the default
to CONFIG_SLUB while I wasn't looking....

(Maybe the order of entries needs fixing - SLAB, SLAB_DEBUG, SLUB, SLUB_DEBUG,
so that oldconfig and friends don't pop the question for debugging till *after*
they ask if the feature should be included?

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