[HOWTO] Compile modules for stock kernels

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I couldn't figure out how to compile a module for stock kernel - I kept getting the following in dmesg:

<module>: disagrees about version of symbol module_layout

I sent a message to Samsung Open Source Release Center on Friday and received a very helpful response yesterday. Basically, c1_rev02_defconfig contains some debug options that are not set in the actual kernel. These are the options that should not be set in the config:

CONFIG_DEBUG_PREEMPT
CONFIG_DEBUG_RT_MUTEXES
CONFIG_DEBUG_SPINLOCK
CONFIG_DEBUG_MUTEXES
CONFIG_PROFILING
CONFIG_PERF_EVENTS
CONFIG_PERF_COUNTERS
CONFIG_LATENCYTOP
CONFIG_FTRACE

You can use the attached script to modify all these values (the script was also supplied by Samsung, although it was syntactically incorrect and a couple of modifications were necessary to make it work). I have included a copy of the c1_rev02_defconfig with these modifications.

Using this config, I was finally able to compile modules that can actually be loaded on the device

Kudos to Samsung for sending me this information.

Nice info I guess that will help out the people who had issues with kernel modules on stock ROMs...

Originally Posted by jps1974

Kudos to Samsung for sending me this information.

No, that is the stuff they should put on their server. Makes you wonder what else they haven't released. Every time they make modifications to the GPL open source code (eg. kernel) and release a new version, they must release the code, and the exact same files they used to build it.

Thanks

That was the info I missed. I have successfully compiled cifs for kf1.

Sent from my GT-I9100 using XDA App

You know guys if there is a basic tutorial available online?.

Thank you!

Hi, I am new to compile modules for android (new to compile kernel anyway)

thanks for your info and config, I am now able to compile modules.

I had a problem on the compiled modules tho, wonder can anyone please point me some direction?

when I insmod the ko, dmesg gives me:
xyz.ko : no symbol version for module_layout

Any hint?

more info, I am compiling like:
I am aiming on compiling to for stock ROM, uname -r > 2.6.35.7-I9100XWKDD-CL161513
- I read, and follow base on http://forum.xda-developers.com/show....php?t=1113191
- kernel source from: SHW-M250L kernel source from OSRC, https://opensource.samsung.com/
- .config file of this post, select my wanted modules using make menuconfig
- then make ARCH=arm CROSS_COMPILE=__MYPATH__/bin/arm-none-eabi- modules

Thanks!

Hi,
I'm using insecure kernel :

#uname -r
2.6.35.7-I9100XWKE2-CL187606

I cross compiled modules using your config file but each time I'm trying to insmod it, I have: failed (Exec format error)
and busybox insmod gives me a invalid module format error

I use the commands :

make ARCH=arm CROSS_COMPILE=/opt/toolchains/arm-2009q3/bin/arm-none-linux-gnueabi- menuconfig

make ARCH=arm CROSS_COMPILE=/opt/toolchains/arm-2009q3/bin/arm-none-linux-gnueabi- modules

So I don't really know where I'm wrong here

Originally Posted by alx5962

Hi,
I'm using insecure kernel :

#uname -r
2.6.35.7-I9100XWKE2-CL187606

I cross compiled modules using your config file but each time I'm trying to insmod it, I have: failed (Exec format error)
and busybox insmod gives me a invalid module format error

I use the commands :

make ARCH=arm CROSS_COMPILE=/opt/toolchains/arm-2009q3/bin/arm-none-linux-gnueabi- menuconfig

make ARCH=arm CROSS_COMPILE=/opt/toolchains/arm-2009q3/bin/arm-none-linux-gnueabi- modules

So I don't really know where I'm wrong here

can you do a dmesg here?
I "think" I am on a same boat as you are on the error tho.....

I didn't checked dmesg, shame on me !
so the error is :
joydev: no symbol version for module_layout

I used your config file, do I need to fix config each time I update with menuconfig ?

Originally Posted by alx5962

I didn't checked dmesg, shame on me !
so the error is :
joydev: no symbol version for module_layout

I used your config file, do I need to fix config each time I update with menuconfig ?

dmesg is good to read, we are both compiling the same module (joydev)

the config file is not from me, is from jps1974.
no I don't think you need to fix unless you uses the build_kernel.sh unmod, since it cp the defconfig everytime, still I face the same problem...