There's A Kernel Subsystem Being Dropped In Linux 5.3 As Easier To Start Over Than Fix
The GPIO updates for the newly-opened Linux 5.3 kernel merge window is dropping the FMC subsystem as they deem it easier to re-start from scratch writing that code than to try to repair it, or "start over using the proper kernel subsystems than try to polish the rust shiny." Funny enough, this code is being used by the CERN's well known Large Hadron Collider...