Steps to replace 3.x kernel on RHEL7 with a ML kernel from elrepo.org.
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install -y kernel-ml
yum --enablerepo=elrepo-kernel swap -y kernel-headers -- kernel-ml-headers
yum --enablerepo=elrepo-kernel swap -y kernel-tools-libs -- kernel-ml-tools-libs
yum --enablerepo=elrepo-kernel install -y kernel-ml-tools
yum --enablerepo=elrepo-kernel swap -y kernel-devel -- kernel-ml-devel
yum -y remove kernel
reboot