compat-drivers as a whole aims to always be compiled and used with the
oldest stable kernel supported by kernel.org. This will be the oldest
stable kernel on the 2.6. series listed on the kernel.org front page.
Sometimes we'll go even beyond that.

Backporting compat-drivers involves backporting some subsystems but
at times we may want to support compiling only certain drivers on older
kernels since its easier to backport some subsystems. Such is the case
with PCI drivers. This directly exists to allow developers enable
compilation of compat-drivers on older drivers using ./scripts/driver-select
Upon selection of a driver a patch from this directly will be applied to
allow further compilation of one driver onto even older kernels.
