OpenSUSE 13: Rebuild kernel with srcpackage

Table of Contents

1 Install packages for building kernel

Install rpm-build for rpmbuild and patterns-openSUSE-devel_kernel for building kernel.

> sudo zypper -n in rpm-build patterns-openSUSE-devel_kernel

2 Download kernel srcpackage

Download kernel-desktop srcpackage. Download kernel-macros which is need to build kernel.

> # If you have already downloaded other package, clear /usr/src/packages.> # sudo rm -rf /usr/src/packages/*> sudo zypper -n si kernel-desktop kernel-macros> cp -a /usr/src/packages ~/rpmbuild> cd ~/rpmbuild> rpmbuild -bp SPECS/kernel-desktop.spec

For building vanilla kernel, download kernel-vanilla and kernel-macro.

3 Change kernel version

Change kernel version for avoiding conflicting installed kernel. Change Release variable in spec file.

> sed -i -e ‘s/^Release:(.*)/Release:1.hiroom2/g’ SPECS/kernel-desktop.spec> diff -uprN SPECS/kernel-desktop.spec{.org,}— SPECS/ 2016-12-25 17:35:06.963941101 +0900+++ SPECS/kernel-desktop.spec 2016-12-25 17:36:07.145422377 +0900@@ -61,9 +61,9 @@ License: GPL-2.0 Group: System/Kernel Version: 3.16.7 %if 0%{?is_kotd}-Release: 53.1.g7b4a1f9+Release: 53.1.g7b4a1f9.hiroom2 %else-Release: 53.1+Release: 53.1.hiroom2 %endif Url: BuildRequires: bc

4 Change kernel configuration

Kernel configurations are in SOURCES/config.tar.bz2 like config/<arch>/<type> (e.g. arch is x86_64 and type is desktop).

  • Extract config.tar.bz2 and copy to .config in kernel directory.
  • Move to kernel directory and change .config with make menuconfig.
  • Save .config to config/<arch>/<type> and compress to config.tar.bz2.

> tar jxf SOURCES/config.tar.bz2> cp config/x86_64/desktop BUILD/kernel-desktop-3.16.7/linux-3.16/.config> cd BUILD/kernel-desktop-3.16.7/linux-3.16> make menuconfig # Change kernel config> cp .config ../../../config/x86_64/desktop> cd ../../..> tar jcf SOURCES/config.tar.bz2 config

This article disables CONFIG_PRINTK_TIME.

> tar jxf SOURCES/config.tar.bz2> sed -i -e ‘s/CONFIG_PRINTK_TIME=y/# CONFIG_PRINTK_TIME is not set/g’ config/x86_64/desktop> tar jcf SOURCES/config.tar.bz2 config

5 Change kernel source code

Paches are in SOURCES/patches.<type>.tar.bz2 and patches will be applied by SOURCES/series.conf.

Add original patch to SOURCES/patches.addon.tar.bz2 and add patch entry to SOURCES/series.conf.

tar jxf SOURCES/patches.addon.tar.bz2cat <<EOF > patches.addon/hello.patchdiff -uprN linux-3.16/init/main.c— 2016-12-25 22:38:14.721618205 +0900+++ linux-3.16/init/main.c 2016-12-25 22:40:09.678637730 +0900@@ -944,6 +944,8 @@ static int __ref kernel_init(void *unuse flush_delayed_fput();+ printk(“Hello, Worldn”);+ if (ramdisk_execute_command) { ret = run_init_process(ramdisk_execute_command); if (!ret)EOFtar jcf SOURCES/patches.addon.tar.bz2 patches.addonecho “patches.addon/hello.patch” >> SOURCES/series.conf

6 Build kernel

Build kernel. Building kernel will takes one hour.

> rpmbuild -ba SPECS/kernel-desktop.spec

Install kernel.

> sudo zypper -n in RPMS/x86_64/kernel-desktop-3.16.7-53.1.hiroom2.x86_64.rpm

Reboot OpenSUSE 13.

> sudo reboot

7 Execution result

Execution result is as below after reboot.

> uname -r3.16.7-53.1.hiroom2-desktop> zcat /proc/config.gz | grep CONFIG_PRINTK_TIME# CONFIG_PRINTK_TIME is not set> dmesg | grep Hello[ 2.158619] Hello, World

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