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math64: New DIV_S64_ROUND_CLOSEST helper 

Provide DIV_S64_ROUND_CLOSEST helper which uses div_s64 to perform
division rounded to the closest integer using signed 64bit
dividend and signed 32bit divisor.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Chunyan Zhang 2020-07-24 20:21:47 +08:00 committed by Sebastian Reichel
parent ab92ffd5f6
commit af60459a54
1 changed files with 19 additions and 0 deletions
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19
include/linux/math64.h
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@ -279,4 +279,23 @@ static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
#define DIV64_U64_ROUND_CLOSEST(dividend, divisor) \
({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })
/*
* DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
* @dividend: signed 64bit dividend
* @divisor: signed 32bit divisor
*
* Divide signed 64bit dividend by signed 32bit divisor
* and round to closest integer.
*
* Return: dividend / divisor rounded to nearest integer
*/
#define DIV_S64_ROUND_CLOSEST(dividend, divisor)( \
{ \
s64 __x = (dividend); \
s32 __d = (divisor); \
((__x > 0) == (__d > 0)) ? \
div_s64((__x + (__d / 2)), __d) : \
div_s64((__x - (__d / 2)), __d); \
} \
)
#endif /* _LINUX_MATH64_H */