Commit af60459a authored by Chunyan Zhang's avatar Chunyan Zhang Committed by Sebastian Reichel
Browse files

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: default avatarChunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent ab92ffd5

include/linux/math64.h

+19 −0
Original line number Diff line number Diff line
@@ -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 */