On 2017-10-03 12:49:19 [-0300], Arnaldo Carvalho de Melo wrote: > From: Arnaldo Carvalho de Melo <a...@redhat.com> > > diff --git a/drivers/infiniband/hw/hfi1/pio.c > b/drivers/infiniband/hw/hfi1/pio.c > index 615be68e40b3..3a30bde9a07b 100644 > --- a/drivers/infiniband/hw/hfi1/pio.c > +++ b/drivers/infiniband/hw/hfi1/pio.c > @@ -1421,7 +1421,7 @@ struct pio_buf *sc_buffer_alloc(struct send_context > *sc, u32 dw_len, > > /* there is enough room */ > > - preempt_disable(); > + preempt_disable_nort(); > this_cpu_inc(*sc->buffers_allocated); > > /* read this once */
please replace the preempt_disable() / enable with local_lock() / unlock. The section does not look like it could cope with multiple users dereferencing / using the same per-CPU variables. Sebastian
