linux-kernel - Re: Why does "make oldconfig" always set CONFIG_SLUB

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Message-ID: <20080320201935.GC1328@codemonkey.org.uk>
Date:	Thu, 20 Mar 2008 16:19:35 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Why does "make oldconfig" always set CONFIG_SLUB_DEBUG=y ?

On Thu, Mar 20, 2008 at 08:35:41PM +0100, Toralf Förster wrote:
 > I'm wondering why this option is always set after "make oldconfig" :
 > 
 > tfoerste@n22 ~/devel/linux-2.6 $ grep _SLUB_DEBUG=y .config
 > CONFIG_SLUB_DEBUG=y
 > tfoerste@n22 ~/devel/linux-2.6 $ sed -i -e 's/_SLUB_DEBUG=y/_SLUB_DEBUG=n/' .config
 > tfoerste@n22 ~/devel/linux-2.6 $ grep _SLUB_DEBUG= .config
 > CONFIG_SLUB_DEBUG=n
 > tfoerste@n22 ~/devel/linux-2.6 $ make oldconfig 1>/dev/null
 > tfoerste@n22 ~/devel/linux-2.6 $ grep _SLUB_DEBUG= .config
 > CONFIG_SLUB_DEBUG=y

CONFIG_SLUB_DEBUG is only optional if CONFIG_EMBEDDED is set.
There's little to no cost other than codesize to having it enabled.

	Dave

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