This article will changing kernel configuration and source code, and rebuilding kernel with using srcpackage package.
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/kernel-desktop.spec.org 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: http://www.kernel.org/
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.bz2
cat <<EOF > patches.addon/hello.patch
diff -uprN linux-3.16.org/init/main.c linux-3.16/init/main.c
--- linux-3.16.org/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, World\n");
+
if (ramdisk_execute_command) {
ret = run_init_process(ramdisk_execute_command);
if (!ret)
EOF
tar jcf SOURCES/patches.addon.tar.bz2 patches.addon
echo "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 -r 3.16.7-53.1.hiroom2-desktop > zcat /proc/config.gz | grep CONFIG_PRINTK_TIME # CONFIG_PRINTK_TIME is not set > dmesg | grep Hello [ 2.158619] Hello, World