On Mon 29 Jul 2024 at 15:44, Mark Brown <broonie@xxxxxxxxxx> wrote: > On Mon, Jul 29, 2024 at 04:15:31PM +0200, Jerome Brunet wrote: > >> Maybe mmio regmap should '.use_raw_spinlock = true' by default when >> '.fast_io' is set ? > >> Mark, what is your opinion on this ? I guess it is not the first time >> this occurs ? > > I don't recall this coming up much TBH. It may be that people just set > raw spinlocks when they need it, or that there's not many people using > relevant devices with RT kernels. I have not been playing much with RT TBH, but AFAIK, with RT irq handlers are threaded unless IRQF_NO_THREAD is set. In this case, something preemptible in the handler should not be a problem. The axg-fifo drivers do not have IRQF_NO_THREAD so something is a bit unclear here. -- Jerome
