[SOLVED] How to build kernel and kernel modules for specific kernel version magic?

Issue

I need to build kernel to have vermagic

3.10.28-gbc1b510-33899-g9fa745e SMP preempt mod_unload modversions ARMv7

but after building and verification some module via modinfo it displays

3.10.28 preempt mod_unload modversions ARMv6

Looks like I can't load module because different vermagic. How to build kernel and modules for vermagic to be axactly the same ?. I'm using buildroot.

I created this shell script in order to prepare for build

#!/bin/sh
export PATH=$PATH:/buildroot-2018.02.3/output/host/arm-buildroot-linux-gnueabi/bin:/buildroot-2018.02.3/output/host/bin:/buildroot-2018.02.3/output/host/sbin:/buildroot-2018.02.3/output/host/bin
export LD_LIBRARY_PATH=/buildroot-2018.02.3/output/host/lib
export LIBRARY_PATH=/buildroot-2018.02.3/output/host/lib
export PKG_CONFIG_PATH=/buildroot-2018.02.3/output/host/arm-buildroot-linux-gnueabi/sysroot/usr/lib/pkgconfig
exec /bin/bash

then I enter folder

/buildroot-2018.02.3/output/build/linux-3.10.28/

and

make distclean
make clean

then copy .config and

make ARCH=arm menuconfig

and

make -j9 ARCH=arm

I'm using original kernel konfig with additionaly selected a few options to build as modules without modifications of any other.

Solution

There is linux-3.10.28/arch/arm/Makefile file. In this file there are those defines

arch-$(CONFIG_CPU_32v7)     :=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)
arch-$(CONFIG_CPU_32v6)     :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)

I found suggestion somewhere which lead me to replace

arch-$(CONFIG_CPU_32v6)     :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)

with

arch-$(CONFIG_CPU_32v6)     :=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)

I olso uncommented these two:

tune-$(CONFIG_CPU_V6)       :=$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm)
tune-$(CONFIG_CPU_V6K)      :=$(call cc-option,-mtune=arm1136j-s,-mtune=strongarm)

I added

-gbc1b510-33899-g9fa745e SMP

as local_version in kernel .config

and now version string print by modinfo is the same.

Answered By - Daro