yum update kernel
yum update && yum upgrade
# rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
# yum –disablerepo=”*” –enablerepo=”elrepo-kernel” list available
# yum –enablerepo=elrepo-kernel install kernel-ml
# uname -sr