math64: New DIV_S64_ROUND_CLOSEST helper (af60459a) · Commits · 戴 / test

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>

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 */

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