Aug 01 2009

drivers/net/wireless: Use DIV_ROUND_CLOSEST 

Author: Julia Lawall <julia@diku.dk>

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@haskernel@
@@

#include 

@depends on haskernel@
expression x,__divisor;
@@

- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// 

Signed-off-by: Julia Lawall 
Signed-off-by: John W. Linville 

---
 drivers/net/wireless/strip.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
 
diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index 73300c2..ef2cb20 100644
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -1550,9 +1550,12 @@ static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	if (time_after(jiffies, strip_info->pps_timer + HZ)) {
 		unsigned long t = jiffies - strip_info->pps_timer;
-		unsigned long rx_pps_count = (strip_info->rx_pps_count * HZ * 8 + t / 2) / t;
-		unsigned long tx_pps_count = (strip_info->tx_pps_count * HZ * 8 + t / 2) / t;
-		unsigned long sx_pps_count = (strip_info->sx_pps_count * HZ * 8 + t / 2) / t;
+		unsigned long rx_pps_count =
+			DIV_ROUND_CLOSEST(strip_info->rx_pps_count*HZ*8, t);
+		unsigned long tx_pps_count =
+			DIV_ROUND_CLOSEST(strip_info->tx_pps_count*HZ*8, t);
+		unsigned long sx_pps_count =
+			DIV_ROUND_CLOSEST(strip_info->sx_pps_count*HZ*8, t);
 
 		strip_info->pps_timer = jiffies;
 		strip_info->rx_pps_count = 0;

qlambert