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    Subject[PATCH v3 1/5] math64: New DIV_U64_ROUND_CLOSEST helper
    Date
    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
    --
    2.20.1
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