> Apart from this - what is the status of the patch, is it redhat-only or is it on its way to the upstream?

I had a conversation with some of the RH kernel devs a few weeks ago and from my (hazy) memory, this comes from Red Hats acquisition of permabit so it was closed source, its now GPL'd but needs a fair amount of tidying up and bits rewriting to get it into a state that the kernel developers would accept it (they reimplemented some standard kernel features so they didn't have to link to GPL'd code). So it will be upstreamed but it will take time.

In the meantime its released for RHEL only, not even in Fedora. Iirc could be ported to other distros (its 100% GPLed) its just not been.