Compile specific kernel module for my router's kernel version

Question

I've a router that runs Linux kernel version of 2.6.33, it came without tun/tap support. The cpu is MIPSlittle endien. I setup a buildroot and successed compile "Hello world" program for the router.

I'm trying to compile tun.c from linux-kernel-2.6.33/drivers/net/tun.c as a standalone kernel object. But I have not successed yet! I use buildroot to get the header files for the kernel (by make menuconfig) and setup a Makefile for tun.c:

obj-m := tun.o
KDIR=/opt/buildroot/output/build/linux-kernel-2.6.33
PWD=$(shell pwd)
default:
    $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
    $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean

I run the make file with

make ARCH=mips CROSS_COMPILE=/opt/buildroot/output/bin/buildroot-compiler-

I got warnings and erros:

Warning: Symbol version dump /opt/buildroot/output/build/linux-kernel-2.6.33/Module.symvers is missing; modules will have no dependencies and modversions.

include/linux/mmzone.h:18:30: fatel error: generated/bounds.h. No such or directory .#include

Which one of my steps are wrong?

so you are compiling a module for an older kernel version then it was meant for? your title states that but i don't see that is your code so i am a little confused — jgr208, Sep 29 '16 at 16:40
@jgr208 I am trying to compile 2.6.33 kernel module within the linux kernel tree (tun.c) — ssdfdsfsd, Sep 29 '16 at 16:56
the problem is the header file is not there it appears, the first is a warning and has no effect. look for the file in `/usr/include` — jgr208, Sep 29 '16 at 16:59

score 2 · Answer 1 · answered Sep 29 '16 at 17:15

2

I'm betting you're trying to build your module against a pure, unconfigured kernel source tree. you can't do that. Your kernel tree must, at the very least, be configured and, more than that, it should have make modules_prepare run at the top level.

Running cd /usr/src/linux && make modules_prepare should solve your problem.

answered Sep 29 '16 at 17:15

jgr208

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You must also use a kernel configuration that corresponds to what is used on the board. Also, it is not /usr/src/linux but the extracted linux-2.6.33. I edited the answer accordingly. – Arnout Sep 29 '16 at 19:31

Compile specific kernel module for my router's kernel version

1 Answers1