openwrt-archive/target/linux/mvebu/patches-4.4/039-net-mvneta-Use-on_each_cpu-when-possible.patch

From: Gregory CLEMENT <gregory.clement@free-electrons.com>
Date: Thu, 4 Feb 2016 22:09:25 +0100
Subject: [PATCH] net: mvneta: Use on_each_cpu when possible

Instead of using a for_each_* loop in which we just call the
smp_call_function_single macro, it is more simple to directly use the
on_each_cpu macro. Moreover, this macro ensures that the calls will be
done all at once.

Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2553,7 +2553,7 @@ static void mvneta_percpu_mask_interrupt
 
 static void mvneta_start_dev(struct mvneta_port *pp)
 {
-	unsigned int cpu;
+	int cpu;
 
 	mvneta_max_rx_size_set(pp, pp->pkt_size);
 	mvneta_txq_max_tx_size_set(pp, pp->pkt_size);
@@ -2569,9 +2569,8 @@ static void mvneta_start_dev(struct mvne
 	}
 
 	/* Unmask interrupts. It has to be done from each CPU */
-	for_each_online_cpu(cpu)
-		smp_call_function_single(cpu, mvneta_percpu_unmask_interrupt,
-					 pp, true);
+	on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true);
+
 	mvreg_write(pp, MVNETA_INTR_MISC_MASK,
 		    MVNETA_CAUSE_PHY_STATUS_CHANGE |
 		    MVNETA_CAUSE_LINK_CHANGE |
@@ -2991,7 +2990,7 @@ static int mvneta_percpu_notifier(struct
 static int mvneta_open(struct net_device *dev)
 {
 	struct mvneta_port *pp = netdev_priv(dev);
-	int ret, cpu;
+	int ret;
 
 	pp->pkt_size = MVNETA_RX_PKT_SIZE(pp->dev->mtu);
 	pp->frag_size = SKB_DATA_ALIGN(MVNETA_RX_BUF_SIZE(pp->pkt_size)) +
@@ -3024,9 +3023,7 @@ static int mvneta_open(struct net_device
 	/* Enable per-CPU interrupt on all the CPU to handle our RX
 	 * queue interrupts
 	 */
-	for_each_online_cpu(cpu)
-		smp_call_function_single(cpu, mvneta_percpu_enable,
-					 pp, true);
+	on_each_cpu(mvneta_percpu_enable, pp, true);
 
 
 	/* Register a CPU notifier to handle the case where our CPU
@@ -3313,9 +3310,7 @@ static int  mvneta_config_rss(struct mvn
 
 	netif_tx_stop_all_queues(pp->dev);
 
-	for_each_online_cpu(cpu)
-		smp_call_function_single(cpu, mvneta_percpu_mask_interrupt,
-					 pp, true);
+	on_each_cpu(mvneta_percpu_mask_interrupt, pp, true);
 
 	/* We have to synchronise on the napi of each CPU */
 	for_each_online_cpu(cpu) {