diff options
| author | Darrick J. Wong <djwong@us.ibm.com> | 2009-01-06 14:40:51 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 15:59:12 -0800 |
| commit | 9fe06081ef145d6582c39e18203b5fffe6f3abc2 (patch) | |
| tree | 290e0e6019f0aad96041340ce9b89bb8edf23840 | |
| parent | 30079677428ae1349d5063b96f677270dfd54309 (diff) | |
Create a DIV_ROUND_CLOSEST macro to do division with rounding
Create a helper macro to divide two numbers and round the result to the
nearest whole number. This is a helper macro for hwmon drivers that want
to convert incoming sysfs values per standard hwmon practice, though the
macro itself can be used by anyone.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/kernel.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index ca9ff6411dfa..721984844c94 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -48,6 +48,12 @@ extern const char linux_proc_banner[]; #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) +#define DIV_ROUND_CLOSEST(x, divisor)( \ +{ \ + typeof(divisor) __divisor = divisor; \ + (((x) + ((__divisor) / 2)) / (__divisor)); \ +} \ +) #define _RET_IP_ (unsigned long)__builtin_return_address(0) #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; }) |