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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/math64.h
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@@ -28,7 +28,7 @@
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 	return dividend / divisor;
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 }
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-/**
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+/*
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  * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
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  * @dividend: signed 64bit dividend
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  * @divisor: signed 32bit divisor
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@@ -42,7 +42,7 @@
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 	return dividend / divisor;
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 }
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-/**
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+/*
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  * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
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  * @dividend: unsigned 64bit dividend
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  * @divisor: unsigned 64bit divisor
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@@ -56,7 +56,7 @@
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 	return dividend / divisor;
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 }
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-/**
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+/*
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  * div64_u64 - unsigned 64bit divide with 64bit divisor
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  * @dividend: unsigned 64bit dividend
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  * @divisor: unsigned 64bit divisor
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@@ -68,7 +68,7 @@
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 	return dividend / divisor;
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 }
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-/**
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+/*
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  * div64_s64 - signed 64bit divide with 64bit divisor
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  * @dividend: signed 64bit dividend
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  * @divisor: signed 64bit divisor
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@@ -263,7 +263,41 @@
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 }
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 #endif /* mul_u64_u32_div */
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+u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div);
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+
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 #define DIV64_U64_ROUND_UP(ll, d)	\
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 	({ u64 _tmp = (d); div64_u64((ll) + _tmp - 1, _tmp); })
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+/**
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+ * DIV64_U64_ROUND_CLOSEST - unsigned 64bit divide with 64bit divisor rounded to nearest integer
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+ * @dividend: unsigned 64bit dividend
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+ * @divisor: unsigned 64bit divisor
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+ *
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+ * Divide unsigned 64bit dividend by unsigned 64bit divisor
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+ * and round to closest integer.
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+ *
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+ * Return: dividend / divisor rounded to nearest integer
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+ */
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+#define DIV64_U64_ROUND_CLOSEST(dividend, divisor)	\
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+	({ u64 _tmp = (divisor); div64_u64((dividend) + _tmp / 2, _tmp); })
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+
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+/*
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+ * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
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+ * @dividend: signed 64bit dividend
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+ * @divisor: signed 32bit divisor
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+ *
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+ * Divide signed 64bit dividend by signed 32bit divisor
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+ * and round to closest integer.
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+ *
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+ * Return: dividend / divisor rounded to nearest integer
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+ */
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+#define DIV_S64_ROUND_CLOSEST(dividend, divisor)(	\
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+{							\
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+	s64 __x = (dividend);				\
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+	s32 __d = (divisor);				\
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+	((__x > 0) == (__d > 0)) ?			\
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+		div_s64((__x + (__d / 2)), __d) :	\
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+		div_s64((__x - (__d / 2)), __d);	\
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+}							\
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+)
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 #endif /* _LINUX_MATH64_H */