Hi, + linux arm kernel
On Thu, 31 Mar 2016 14:36:30 +0800 Jisheng Zhang wrote: > The rx descriptors are allocated using dma_alloc_coherent, so prefetch > doesn't really happen at all. This is for RFC, I'm sorry to send it without changing its title -- s/PATCH/RFC. I'm not sure whether there's any benefit to prefetch on space allocated from dma_alloc_coherent. Thanks > > Signed-off-by: Jisheng Zhang <jszh...@marvell.com> > --- > drivers/net/ethernet/marvell/mvneta.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/net/ethernet/marvell/mvneta.c > b/drivers/net/ethernet/marvell/mvneta.c > index 5880871..6c09a27 100644 > --- a/drivers/net/ethernet/marvell/mvneta.c > +++ b/drivers/net/ethernet/marvell/mvneta.c > @@ -757,7 +757,6 @@ mvneta_rxq_next_desc_get(struct mvneta_rx_queue *rxq) > int rx_desc = rxq->next_desc_to_proc; > > rxq->next_desc_to_proc = MVNETA_QUEUE_NEXT_DESC(rxq, rx_desc); > - prefetch(rxq->descs + rxq->next_desc_to_proc); > return rxq->descs + rx_desc; > } >
