From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sven Eckelmann <sven.eckelmann@gmx.de>
Date: Fri, 10 Apr 2009 12:31:07 +0200
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Message-Id: <200904101231.14877.sven.eckelmann@gmx.de>
Subject: [B.A.T.M.A.N.] Out of tree builds of kernel modules
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Hi,
I have currently following problem with batman-adv-kernelland and batmand-
gateway:

Danial Baumann supports building of kernel modules against the current Debi=
an=20
kernel in sid with his linux-modules-extra-2.6 package. The module sources=
=20
must only to support build over the kernel headers. It is done like that:
 /usr/bin/make -C /usr/src/linux-headers-2.6.29-1-amd64 M=3D/batman-adv/

So it calls the Makefile in /usr/src/linux-headers-2.6.29-1-amd64 to build =
the=20
sources in /batman-adv/. This seems to be a quite common way to do the buil=
d.=20
There are different problems with the way the current Makefiles of these=20
modules are written.

=46irst thing is that there is a Makefile.kbuild which is included with=20
 include $(PWD)/Makefile.kbuild
This will not work in the current situation because the PWD is now=20
/usr/src/linux-headers-2.6.29-1-amd64. Is this extra Makefile.kbuild really=
=20
needed?
The second problem is the check of KERNELPATH of Makefile. It will check if=
=20
the sources of the current kernel is installed and quits if not (+ error=20
message that someone should set the KERNELPATH variable). In the current=20
situation we don't have the sources of the current kernel installed, but th=
e=20
kernel headers of another kernel are being used automatically. Wouldn't be=
=20
following check

 KERNELPATH ?=3D /lib/modules/$(shell uname -r)/build
 # sanity check: does KERNELPATH exist?
 ifeq ($(shell cd $(KERNELPATH) && pwd),)
 $(warning $(KERNELPATH) is missing, please set KERNELPATH)
 endif

ok too?

The batmand-gateway cannot be build for linux 2.6 if the current kernel is =
a=20
2.4.x. Isn't it possible to make the obj-m and batgat-objs assignment outsi=
de=20
the check for the kernel version?

My current workaround is to install my own version of the Makefile in the=20
debian package, but I ask myself if this is really needed or parts of it=20
should also be changed upstream.

Best regards,
	Sven

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