Wanted to install mainline kernel 5 on my CentOS

> yum -y install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm

> rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

> yum --enablerepo=elrepo-kernel install kernel-ml

> yum -y --enablerepo=elrepo-kernel install kernel-ml-{devel,headers,perf}

After a reboot, I uninstalled all other kernel versions e.g.

> yum remove kernel 

(if you wanted to install a kernel with long term support choose *-lt instead of *-ml)