linux-kernel - Re: How can I build a 2.4 kernel on a 2.6 System

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Date:	Sun, 26 Oct 2008 11:32:17 +0100
From:	Jörg Dohle <j.d.-linux-kernel@...or.de>
To:	"Willy Tarreau" <w@....eu>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: How can I build a 2.4 kernel on a 2.6 System

Hello Willy

Thanks for answering, but I have a problem with the compiling.
When I try to compile the 2.4 kernel with the following commands:

# make clean && make mrproper
then I restore the .config file
# make oldconfig
# make dep && make bzImage respectively make modules


 I get the following error message:

make[1]: Leaving directory 
`/fileserver/99_Frei/kernel-build-tree/linux-2.4.21-57.EL'
gcc -D__KERNEL__ -I/fileserver/99_Frei/kernel-build-tree/linux-2.4.21-57.EL/include 
 -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common 
  -Wno-unused -fomit-frame-pointer -pipe -freorder-blocks  -march=i386   -DKBUILD_BASENAME=main 
 -c -o init/main.o init/main.c
init/main.c:1: Fehler: Die ausgewählte CPU unterstützt nicht den x86-64 
Befehlssatz

English translation (by google)
init / main.c: 1: Error: The selected CPU does not support x86-64 
instruction


I use a x86_64 system with a 2.6.16.60-0.31-smp kernel for compiling 2.4 
kernel modules.

I think some compiler information are missing for make.

Could you help me?


----- Original Message ----- 
From: "Willy Tarreau" <w@....eu>
To: <j.d.-linux-kernel@...or.de>
Cc: <linux-kernel@...r.kernel.org>
Sent: Friday, October 24, 2008 9:29 PM
Subject: Re: How can I build a 2.4 kernel on a 2.6 System


> Hi,
>
> On Fri, Oct 24, 2008 at 02:16:40PM +0200, j.d.-linux-kernel@...or.de 
> wrote:
>> Hello list
>>
>> I will build some 2.4 kernel modules on a system with a running 2.6 
>> kernel.
>>
>> Is it possible and how can I do this?
>
> Not sure what you really mean. If you mean build 2.4 modules for 2.4 on
> a machine running 2.6, that's OK as there's no dependency between the
> running kernel and the one you're building. However, you should be
> careful about two things :
>  - gcc: it tends to be too recent for 2.4. gcc 4.1 is the highest version
>    supported.
>  - modutils: most recent distros only ship module-init-tools without the
>    old depmod. If you intend to "make modules_install 
> INSTALL_MOD_PATH=..."
>    then get prepared to see some errors from depmod at the end. The 
> easiest
>    solution consists in getting a depmod from an old machine an installing
>    it in /tmp for instance.
>
> Hoping this helps,
> Willy
>
> --
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