diff options
Diffstat (limited to 'include/uapi/linux/const.h')
| -rw-r--r-- | include/uapi/linux/const.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h index e16be0d37746..565f309b9df8 100644 --- a/include/uapi/linux/const.h +++ b/include/uapi/linux/const.h @@ -33,7 +33,7 @@ * Missing asm support * * __BIT128() would not work in the asm code, as it shifts an - * 'unsigned __init128' data type as direct representation of + * 'unsigned __int128' data type as direct representation of * 128 bit constants is not supported in the gcc compiler, as * they get silently truncated. * @@ -50,4 +50,22 @@ #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) +/* + * Divide positive or negative dividend by positive or negative divisor + * and round to closest integer. Result is undefined for negative + * divisors if the dividend variable type is unsigned and for negative + * dividends if the divisor variable type is unsigned. + */ +#define __KERNEL_DIV_ROUND_CLOSEST(x, divisor) \ +({ \ + __typeof__(x) __x = x; \ + __typeof__(divisor) __d = divisor; \ + \ + (((__typeof__(x))-1) > 0 || \ + ((__typeof__(divisor))-1) > 0 || \ + (((__x) > 0) == ((__d) > 0))) ? \ + (((__x) + ((__d) / 2)) / (__d)) : \ + (((__x) - ((__d) / 2)) / (__d)); \ +}) + #endif /* _UAPI_LINUX_CONST_H */ |