Commit 2c861b73 authored by Pali Rohár's avatar Pali Rohár Committed by Greg Kroah-Hartman
Browse files

math64: New DIV_U64_ROUND_CLOSEST helper 



Provide DIV_U64_ROUND_CLOSEST helper which uses div_u64 to perform
division rounded to the closest integer using unsigned 64bit
dividend and unsigned 32bit divisor.

Reviewed-by: default avatarMarek Behún <kabel@kernel.org>
Signed-off-by: default avatarPali Rohár <pali@kernel.org>
Signed-off-by: default avatarMarek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20220219152818.4319-2-kabel@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 679875d1

include/linux/math64.h

+13 −0
Original line number Diff line number Diff line
@@ -300,6 +300,19 @@ u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div); 
#define DIV64_U64_ROUND_CLOSEST(dividend, divisor)	\

	({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })



/*

 * DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer

 * @dividend: unsigned 64bit dividend

 * @divisor: unsigned 32bit divisor

 *

 * Divide unsigned 64bit dividend by unsigned 32bit divisor

 * and round to closest integer.

 *

 * Return: dividend / divisor rounded to nearest integer

 */

#define DIV_U64_ROUND_CLOSEST(dividend, divisor)	\

	({ u32 _tmp = (divisor); div_u64((u64)(dividend) + _tmp / 2, _tmp); })



/*

 * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer

 * @dividend: signed 64bit dividend