linux kernel build on ubuntu

Short note

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# 1. Clone the kernel to your local machine

$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

$ cd linux-stable

# 1.1 optional Github mirror link, i prefer github over kernel.org

$ git clone https://github.com/torvalds/linux.git

$ cd linux

# 2. check kernel version

$ make kernelversion

$ uname -ra

# 3. Find the tag for the version you want

$ git tag -l | grep 4.20

v4.20

v4.20.rc...

# 4. Create a new branch with that tag

$ git checkout -b my4.20 v4.20

# 5. use Ubuntu proper config

# 5.1 use default defconfig for the system

$ make defconfig

# 5.2 use current ubuntu config, /boot/config-*

$ cp /boot/config-`uname -r` .config

# if same version or very close to current version

$ make oldconfig

# otherwise, choose default one, very safe

$ yes '' | make oldconfig

# 5.2.1 optional, change kernel options

$ make menuconfig

#make debian packages, *.deb will be copied in ../ (outside of linux build root)

$ make deb-pkg -j 16

# copied *.deb to target machine. Generally 3 files

# then install debian package. No particular order is required

$ sudo dpkg -i *.deb