diff options
| author | Soren Brinkmann | 2013-11-21 13:38:53 -0800 |
|---|---|---|
| committer | Michal Simek | 2014-02-19 09:41:21 +0100 |
| commit | 23d5c738664918b1cb11cfffe5fbd79940d68c49 (patch) | |
| tree | 012b2ee2026a3116af793089a70351d470ec475f /include | |
| parent | bf83495040fcf273eba534f7c2c0cb2325d2240c (diff) | |
common: Provide DIV_ROUND_CLOSEST macro
Provide the DIV_ROUND_CLOSEST macro - taken from the Linux kernel - in
common.h
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/common.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index 221b7768c5b..ea3e5ed69f1 100644 --- a/include/common.h +++ b/include/common.h @@ -964,6 +964,22 @@ static inline phys_addr_t map_to_sysmem(const void *ptr) #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) +/* + * Divide positive or negative dividend by positive divisor and round + * to closest integer. Result is undefined for negative divisors and + * for negative dividends if the divisor variable type is unsigned. + */ +#define DIV_ROUND_CLOSEST(x, divisor)( \ +{ \ + typeof(x) __x = x; \ + typeof(divisor) __d = divisor; \ + (((typeof(x))-1) > 0 || \ + ((typeof(divisor))-1) > 0 || (__x) > 0) ? \ + (((__x) + ((__d) / 2)) / (__d)) : \ + (((__x) - ((__d) / 2)) / (__d)); \ +} \ +) + #define ALIGN(x,a) __ALIGN_MASK((x),(typeof(x))(a)-1) #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |