drivers/atm: Use DIV_ROUND_UP
The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.
In the case of the file drivers/atm/eni.c, I am a little bit suspicious of
the -1 at the end of the affected expression. Please check that that is
what is wanted.
An extract of the semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@haskernel@
@@
#include <linux/kernel.h>
@depends on haskernel@
expression n,d;
@@
(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP((n),d)
+ DIV_ROUND_UP(n,d)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP(n,(d))
+ DIV_ROUND_UP(n,d)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/atm/horizon.c b/drivers/atm/horizon.c
index c0ac728..6154123 100644
--- a/drivers/atm/horizon.c
+++ b/drivers/atm/horizon.c
@@ -635,7 +635,7 @@
// take care of rounding
switch (r) {
case round_down:
- pre = (br+(c<<div)-1)/(c<<div);
+ pre = DIV_ROUND_UP(br, c<<div);
// but p must be non-zero
if (!pre)
pre = 1;
@@ -668,7 +668,7 @@
// take care of rounding
switch (r) {
case round_down:
- pre = (br+(c<<div)-1)/(c<<div);
+ pre = DIV_ROUND_UP(br, c<<div);
break;
case round_nearest:
pre = (br+(c<<div)/2)/(c<<div);
@@ -698,7 +698,7 @@
if (bits)
*bits = (div<<CLOCK_SELECT_SHIFT) | (pre-1);
if (actual) {
- *actual = (br + (pre<<div) - 1) / (pre<<div);
+ *actual = DIV_ROUND_UP(br, pre<<div);
PRINTD (DBG_QOS, "actual rate: %u", *actual);
}
return 0;
@@ -1967,7 +1967,7 @@
// Set the max AAL5 cell count to be just enough to contain the
// largest AAL5 frame that the user wants to receive
wr_regw (dev, MAX_AAL5_CELL_COUNT_OFF,
- (max_rx_size + ATM_AAL5_TRAILER + ATM_CELL_PAYLOAD - 1) / ATM_CELL_PAYLOAD);
+ DIV_ROUND_UP(max_rx_size + ATM_AAL5_TRAILER, ATM_CELL_PAYLOAD));
// Enable receive
wr_regw (dev, RX_CONFIG_OFF, rd_regw (dev, RX_CONFIG_OFF) | RX_ENABLE);