upgrade kernel

1.check current system's version
#uname -r
2.download the linux kernel source code package.
3.uncompress the kernel package to a directory
4.change to the directory
5.make mrproper
6.make menuconfig
 OR
cp /boot/config-? .config; sh -c 'yes ""| make oldconfig'
7.make
8.make modules
9.make modules_install
10.make install