1 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/math64.h b/include/linux/math64.h
index 44282ec7b682..6e8b5b270ffe 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -214,4 +214,33 @@ static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
 
 #endif
 
+#ifndef mul_u64_u32_div
+static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
+{
+        union {
+                u64 ll;
+                struct {
+#ifdef __BIG_ENDIAN
+                        u32 high, low;
+#else
+                        u32 low, high;
+#endif
+                } l;
+        } u, rl, rh;
+
+        u.ll = a;
+        rl.ll = (u64)u.l.low * mul;
+        rh.ll = (u64)u.l.high * mul + rl.l.high;
+
+        /* Bits 32-63 of the result will be in rh.l.low. */
+        rl.l.high = do_div(rh.ll, divisor);
+
+        /* Bits 0-31 of the result will be in rl.l.low. */
+        do_div(rl.ll, divisor);
+
+        rl.l.high = rh.l.low;
+        return rl.ll;
+}
+#endif /* mul_u64_u32_div */
+
 #endif /* _LINUX_MATH64_H */