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| author | Julia Lawall <julia@diku.dk> | 2009-08-01 22:48:27 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 10:29:26 +1000 |
| commit | 14ea58ad797e4e9b7be755aca0fd3925d0713ede (patch) | |
| tree | 864c4d5aeaeeb6a63fe5fb84289fd11ab21732d5 /arch/powerpc/kernel/time.c | |
| parent | 9413c8836a16e9d034928a7f9d3ad81bebd71ce9 (diff) | |
| download | lwn-14ea58ad797e4e9b7be755aca0fd3925d0713ede.tar.gz lwn-14ea58ad797e4e9b7be755aca0fd3925d0713ede.zip | |
powerpc: Use DIV_ROUND_CLOSEST in time init code
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/)
// <smpl>
@haskernel@
@@
#include <linux/kernel.h>
@depends on haskernel@
expression x,__divisor;
@@
- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index eae4511ceeac..edb1edb36469 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -479,7 +479,8 @@ static int __init iSeries_tb_recal(void) unsigned long tb_ticks = tb - iSeries_recal_tb; unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12; unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec; - unsigned long new_tb_ticks_per_jiffy = (new_tb_ticks_per_sec+(HZ/2))/HZ; + unsigned long new_tb_ticks_per_jiffy = + DIV_ROUND_CLOSEST(new_tb_ticks_per_sec, HZ); long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy; char sign = '+'; /* make sure tb_ticks_per_sec and tb_ticks_per_jiffy are consistent */ |