EL5, EL6, EL7 kernel-ml kernel-lt

We provide these kernels for hardware testing in an effort to identify new/updated drivers which can then be targeted for backporting as kmod packages.
Meanwhile, these kernels may provide interim relief to people with non-functional hardware.
We stress that we consider such kernels as a last resort for those who are unable to get their hardware working using the RHEL-7 kernel with supplementary kmod packages.
These packages are provided "As-Is" with no implied warranty or support.
Using the kernel-ml may expose your system to security, performance and/or data corruption issues. Since timely updates may not be available from the ELRepo Project, the end user has the ultimate responsibility for deciding whether to continue using the kernel-ml packages in regular service.
The packages are intentionally named kernel-ml so as not to conflict with the RHEL-7 kernels and, as such, they may be installed and updated alongside the regular kernel. The kernel configuration is based upon a default RHEL-7 configuration with added functionality enabled as appropriate.
If a bug is found when using these kernels, the end user is encouraged to report it upstream to the Linux Kernel Bug Tracker [1] and, for our reference, to the ELRepo bug tracker [2]. By taking such action, the reporter will be assisting the kernel developers, Red Hat and the Open Source Community as a whole.
Thank you,
The ELRepo Team.
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The kernel-lt packages are built from the sources available from The Linux Kernel Archives, just like the kernel-ml packages. The difference is that kernel-lt is based on a long term support branch and kernel-ml is based on the mainline stable branch.
Credits: http://blog.gmane.org/gmane.linux.rpm.elrepo.user