sukisu内核怎么编译

Linux内核怎么编译并生效？
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rpm -ivh kernel-3.10.0-514.16.1.el7.src.rpm
cd ~/rpmbuild/SOURCES/
tar Jxvf linux-3.10.0-514.16.1.el7.tar.xz
cd linux-3.10.0-514.16.1.el7
cp /boot/config-($uname -r) .config
make -j40
make modules
make modules_install
make install
grub2-mkconfig -o /boot/grub2/grub.cfg
cat /boot/grub2/grub.cfg|grep menuentry
grub2-set-default '编译后的内核版本'
reboot