[PATCH 2/4] treewide: drop no-op prefetch() calls

[Rasmus Villemoes]

These all end up using the no-op prefetch() defined in linux/list.h,
because the only possible real implementation is in
arch/mips/include/asm/processor.h, which is behing
CONFIG_CPU_HAS_PREFETCH which is nowhere defined.

In order to be able to drop that fallback definition from list.h,
first remove all uses.

Signed-off-by: Rasmus Villemoes <ravi at prevas.dk>
---
 drivers/net/mvpp2.c               | 1 -
 drivers/net/octeontx/nicvf_main.c | 2 --
 drivers/usb/gadget/at91_udc.c     | 1 -
 drivers/usb/musb-new/musb_core.c  | 2 --
 4 files changed, 6 deletions(-)

diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
index ae545fe229c..184c1f9a46a 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -3876,7 +3876,6 @@ mvpp2_rxq_next_desc_get(struct mvpp2_rx_queue *rxq)
 	int rx_desc = rxq->next_desc_to_proc;
 
 	rxq->next_desc_to_proc = MVPP2_QUEUE_NEXT_DESC(rxq, rx_desc);
-	prefetch(rxq->descs + rxq->next_desc_to_proc);
 	return rxq->descs + rx_desc;
 }
 
diff --git a/drivers/net/octeontx/nicvf_main.c b/drivers/net/octeontx/nicvf_main.c
index 6e4d0a05121..27d0327c88a 100644
--- a/drivers/net/octeontx/nicvf_main.c
+++ b/drivers/net/octeontx/nicvf_main.c
@@ -279,8 +279,6 @@ int nicvf_cq_handler(struct nicvf *nic, void **ppkt, int *pkt_len)
 		cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
 		cqe_head++;
 		cqe_head &= (cq->dmem.q_len - 1);
-		/* Initiate prefetch for next descriptor */
-		prefetch((struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head));
 
 		switch (cq_desc->cqe_type) {
 		case CQE_TYPE_RX:
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 86b2cbf3f6a..b3c780a4e35 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -228,7 +228,6 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
 	}
 
 	buf = req->req.buf + req->req.actual;
-	prefetch(buf);
 	total = req->req.length - req->req.actual;
 	if (ep->ep.maxpacket < total) {
 		count = ep->ep.maxpacket;
diff --git a/drivers/usb/musb-new/musb_core.c b/drivers/usb/musb-new/musb_core.c
index 6375be741ae..a14b127dc37 100644
--- a/drivers/usb/musb-new/musb_core.c
+++ b/drivers/usb/musb-new/musb_core.c
@@ -223,8 +223,6 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
 	struct musb *musb = hw_ep->musb;
 	void __iomem *fifo = hw_ep->fifo;
 
-	prefetch((u8 *)src);
-
 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
 			'T', hw_ep->epnum, fifo, len, src);
 
-- 
2.49.0