Re: [PATCH 1/2] IB/hfi1: Use preempt_{dis,en}able_nort()

[Thomas Gleixner]

On Thu, 5 Oct 2017, Julia Cartwright wrote:
> On Tue, Oct 03, 2017 at 12:49:19PM -0300, Arnaldo Carvalho de Melo wrote:
> > -   preempt_disable();
> > +   preempt_disable_nort();
> >     this_cpu_inc(*sc->buffers_allocated);
> 
> Have you tried this on RT w/ CONFIG_DEBUG_PREEMPT?  I believe that the
> this_cpu_* operations perform a preemption check, which we'd trip.

Good point. Changing this to migrate_disable() would do the trick.

Thanks,

        tglx