Subject: Re: CONFIG_LOG_BUF_SHIFT hardwired in 2.6.0-test4-bk2 ?
From: Nicolas Mailhot <Nicolas.Mailhot@laPoste.net>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20030829114111.18ec26d0.rddunlap@osdl.org>
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	 <20030829113634.3d5a6f20.rddunlap@osdl.org>
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Date: Fri, 29 Aug 2003 20:57:40 +0200
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Le ven 29/08/2003 =E0 20:41, Randy.Dunlap a =E9crit :
> On Fri, 29 Aug 2003 11:36:34 -0700 "Randy.Dunlap" <rddunlap@osdl.org> wro=
te:
>=20
> | On Fri, 29 Aug 2003 20:30:19 +0200 Nicolas Mailhot <Nicolas.Mailhot@laP=
oste.net> wrote:
> |=20
> | | Hi,
> | |=20
> | | 	I'm testing acpi changes and unfortunately all the debug messages
> | | overflow the log buffer. So I decided to increase CONFIG_LOG_BUF_SHIF=
T=20
> | | in .config (there was a menu entry for this at some time in menuconfi=
g
> | | but I can't find it anymore).
> | |=20
> | | 	Anyway no matter what I do the value seems to be reseted to 14 at bu=
ild
> | | time. Is there a way to cleanly change it without poking directly int=
o
> | | the kernel source code ?
> |=20
> | You need to enable DEBUG_KERNEL (kernel debugging) to see it in the men=
u.
> |=20
> | After you edit .config, run 'make oldconfig' and that should fix it.
>=20
> More accurately, you cannot edit .config and make oldconfig on this
> config option if DEBUG_KERNEL is not set.  It won't take effect.
> It will be lost by make oldconfig, so enable DEBUG_KERNEL first.

More accurately if DEBUG_KERNEL is not set you won't get the menuconfig
entry to set it *and* whatever manual changes you to to it in your
.config won't be taken into account.

Which is just plain stupid - if it's linked this hard to DEBUG_KERNEL
what the hell is it doing in another config section ? It's not like it
depended on another option (like usb-storage on usb & scsi). I missed it
both in menuconfig (duh - didn't thought of re-reading the whole menu
structure after enabling debug) and during manual .config edit.

(anyway you solved my problem at light speed and for this you're my day
god - thanks a lot)

--=20
Nicolas Mailhot

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