net: packet: use reciprocal_divide in fanout_demux_hash

Daniel Borkmann · davem330 · commit f55d112e5293 · 2013-08-29T16:43:29.000-04:00
Instead of hard-coding reciprocal_divide function, use the inline
function from reciprocal_div.h.

Signed-off-by: Daniel Borkmann &lt;dborkman@redhat.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
@@ -1135,7 +1135,7 @@ static unsigned int fanout_demux_hash(struct packet_fanout *f,
 				      struct sk_buff *skb,
 				      unsigned int num)
 {
-	return (((u64)skb->rxhash) * num) >> 32;
+	return reciprocal_divide(skb->rxhash, num);
 }
 
 static unsigned int fanout_demux_lb(struct packet_fanout *f,

Original file line number	Diff line number	Diff line change
`@@ -1135,7 +1135,7 @@ static unsigned int fanout_demux_hash(struct packet_fanout *f,`
`1135`	`1135`	`struct sk_buff *skb,`
`1136`	`1136`	`unsigned int num)`
`1137`	`1137`	`{`
`1138`		`- return (((u64)skb->rxhash) * num) >> 32;`
	`1138`	`+ return reciprocal_divide(skb->rxhash, num);`
`1139`	`1139`	`}`
`1140`	`1140`
`1141`	`1141`	`static unsigned int fanout_demux_lb(struct packet_fanout *f,`