This guide is for fedora
clone j1939 linux kernel branch git clone git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git
cd linux-can-next
switch to j1939 branch
copy your current kernel config cp /boot/config-uname -r* .config
enable networking>can>SAE J1939 useing make menuconfig
save your configuration
Change the EXTRAVERSION line to add something on the end. For example, if it reads "EXTRAVERSION = -rc5" change it to "EXTRAVERSION = -rc5-dave" (what you choose is only relevant for the final part of this procedure)
$EDITOR Makefile
build and install kernel
$ make oldconfig
$ make bzImage
$ make modules
(become root)
make modules_install
make install
sudo rsync -a ./usr/include /usr/
should probally fix this with a command from here
https://www.kernel.org/doc/Documentation/kbuild/headers_install.txt
You have now built and installed a kernel. It will show up in the grub menu next time you reboot. if it doesn't shot up as root for a efi boot system
sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
remove kernel
rm -f /boot/config-2.6.*dave* /boot/initrd-2.6.*dave* /boot/vmlinuz-*dave* /boot/System.map-*dave*
rm -rf /lib/modules/2.6*dave*
to remove the grub entry
sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg