linux-kernel - [PATCH] net: mvneta: remove useless RX descriptor prefetch

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Date:	Thu, 31 Mar 2016 14:36:30 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<thomas.petazzoni@...e-electrons.com>,
	<gregory.clement@...e-electrons.com>, <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH] net: mvneta: remove useless RX descriptor prefetch

The rx descriptors are allocated using dma_alloc_coherent, so prefetch
doesn't really happen at all.

Signed-off-by: Jisheng Zhang <jszhang@...vell.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;
 }
 
-- 
2.8.0.rc3