linux - On a PREEMPT_RT linux kernel, how can I modify threads (that were previously ran as interrupts) priority in the pre-compilation stage?

Question

PREEMPT_RT on linux kernel, makes interrupts run as threads, so we have the ability to modify the priorities of interrupts.
By default, all interrupt handler top halves run SCHED_FIFO, with a priority of 50.

Question:
How can I modify these threads priority in the pre-compilation stage (I'm aware I can change these priorities on run-time) ?