On Sat, 25 Apr 2020 at 10:49, Julien Grall <[email protected]> wrote: > > On Sat, 25 Apr 2020 at 03:01, Stefano Stabellini <[email protected]> > wrote: > > [ 86.900974] ------------[ cut here ]------------ > > [ 86.905134] Interrupt for port 6, but apparently not enabled; per-user > > (____ptrval____) > > [ 86.913228] WARNING: CPU: 0 PID: 2437 at drivers/xen/evtchn.c:167 > > evtchn_interrupt+0xfc/0x108 > > The implementation of the evtchn_interrupt() is relying to be called > in the top-half. On RT, interrupts handlers are forced to be threaded > and use the IRQF_ONESHOT semantics if they were not threaded before. > > However, IRQF_ONESHOT is completely broken for event channels (this is > not RT's fault) and hence why you see the warning here. > > Note that you can't force to run evtchn_interrupt() in the top-half > because it relies on functions that may sleep. > > See https://lkml.org/lkml/2019/2/19/642.
Here at better link with the full conversation: https://lore.kernel.org/lkml/[email protected]/ > > Cheers, > > -- > Julien Grall
