How do I compile custom kernels

PREMISE (do only once)

1. sudo dnf install bison bison-devel ccache gcc gcc-c++ lz4 openssl-devel patch qt4-devel

2. makedir -p ~/DATA/devel/CCACHE;

3. compose a custom defconfig via make xconfig && make savedefconfig

4. copy it to ~/DATA/devel/

COMPILE a new custom kernel (do for new kernels)

run the following bash script as user (!) to compile a custom kernel:

!/bin/bash

MY_JOBS=-j8; CCACHE_DIR=~/DATA/devel/CCACHE; export CCACHE_DIR;

NEW_SRC=linux-.xz; OLD_SRC=$(find . -type d -name 'linux-');

if [ -e linux-.xz ] then [ -s ${OLD_SRC} ] && rm -rf ${OLD_SRC}; echo -e "\n unpacking src, wait...\n" tar -Jxf ${NEW_SRC} && mv ${NEW_SRC} ./SRC; OLD_SRC=$(find . -type d -name 'linux-') ccache -cz; fi;

[ -z ${OLD_SRC} ] && echo -e "\n\n damn NO source OR working Linux Tree !!! \n\n" && exit 13;

[ -s defconfig ] && [ ! -e defconfig.OLD ] && cp defconfig defconfig.OLD;

cd ./linux-*;

  echo -e "\n cleaning tree ...\n"

  [ -e vmlinux.o ] && make clean mrproper;
  [ -e defconfig ] && rm -rf ./defconfig;

  echo -e "\n building kernel ...\n"

  [ -s ../defconfig ] && make KCONFIG_ALLCONFIG=../defconfig alldefconfig; 

  make xconfig && make savedefconfig && cp defconfig ../ && make all ${MY_JOBS};   
  RC=$?
  [ "$RC" -gt 0 ] && echo -e "\n error in make\n" && exit 13;

  echo -e "\n installing kernel ...\n"

  sudo make modules_install && sudo make install && sudo rm -rf /boot/{System.map,vmlinuz,*.old} && sudo grub2-mkconfig -o /boot/grub2/grub.cfg; # && sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg;

sync && sync && sync;

exit 0;

my script is NOT completely bug free, there some point I could do better ..., but it runs !!!

What it does (in short): - looks for a new linux-.tar.xz - unpacks it and saves linux-.tar.xz for later use - cleans the tree - generate a new defconfig and save the new one for later use - makes kernel and modules (as user) - installs teh new kernel (as root) - adjusts grub.cfg

How do I compile custom kernels

1. sudo dnf install bison bison-devel ccache gcc gcc-c++ lz4 openssl-devel patch qt4-devel

2. makedir -p ~/DATA/devel/CCACHE;

3. makedir -p ~/DATA/devel/SRC;

4. compose a custom defconfig via make xconfig && make savedefconfig

5. copy it this defconfig to ~/DATA/devel/

run the following bash script as user (!) to compile a custom kernel:

!/bin/bash

(!)

#!/bin/bash

MY_JOBS=-j8;
CCACHE_DIR=~/DATA/devel/CCACHE;
export CCACHE_DIR;
 
NEW_SRC=linux-.xz;
CCACHE_DIR;


NEW_SRC=linux-*.xz;
OLD_SRC=$(find . -type d -name 'linux-');
 
'linux-*');

if [ -e linux-.xz linux-*.xz ]
then
   [ -s ${OLD_SRC} ] && rm -rf ${OLD_SRC};
   echo -e "\n unpacking src, wait...\n"
   tar -Jxf ${NEW_SRC} && mv ${NEW_SRC} ./SRC;
   OLD_SRC=$(find . -type d -name 'linux-')
'linux-*')
   ccache -cz;
fi;
 
fi;

[ -z ${OLD_SRC} ]  && echo -e "\n\n damn NO source OR working Linux Tree !!! \n\n" && exit 13;
 
13;

   [ -s defconfig ] && [ ! -e defconfig.OLD ] && cp defconfig defconfig.OLD;
 
defconfig.OLD;

   cd ./linux-*; 
 
   echo -e "\n cleaning tree ...\n"

   [ -e vmlinux.o ] && make clean mrproper;
   [ -e defconfig ] && rm -rf ./defconfig;

   echo -e "\n building kernel ...\n"

   [ -s ../defconfig ] && make KCONFIG_ALLCONFIG=../defconfig alldefconfig; 

   make xconfig && make savedefconfig && cp defconfig ../ && make all ${MY_JOBS};   
   RC=$?
   [ "$RC" -gt 0 ] && echo -e "\n error in make\n" && exit 13;

   echo -e "\n installing kernel ...\n"

   sudo make modules_install && sudo make install &&  sudo rm -rf /boot/{System.map,vmlinuz,*.old} && sudo grub2-mkconfig -o /boot/grub2/grub.cfg; # /boot/grub2/grub.cfg && sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg;

   sync && sync && sync;

exit 0;
 
sync && sync && sync;
 
exit 0;
 
my script is NOT completely bug free, there some point points I could do better ..., but it runs  !!! !!! 
 
What it does (in short):
short):
 
- looks for a new linux-.tar.xz
linux-*.tar.xz (fetched from kernel.org)
- unpacks it and saves linux-.tar.xz linux-*.tar.xz for later use
- cleans the tree
tree (removes gruft from previous run)
- generate a new defconfig and save saves old one and the new one for later use
- makes kernel and modules (as (runs as user)
- installs teh the new kernel (as (runs as root)
- adjusts grub.cfg
 grub.cfg  (runs as root)