[PATCH v3 1/5] math64: New DIV_U64_ROUND_CLOSEST helper
From: Pali Rohár <pali@kernel.org>
Date: 2021-07-17 12:38:55
Also in:
linux-arm-kernel, linux-clk, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
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. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> --- include/linux/math64.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/include/linux/math64.h b/include/linux/math64.h
index 2928f03d6d46..a14f40de1dca 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h@@ -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
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2.20.1