[NET]: div64_64 consolidate (rev3)

[karo-tx-linux.git] / lib / div64.c

diff --git a/lib/div64.c b/lib/div64.c
index 365719f84832dc7629ecfe6ed55a4070da06e7d1..c3d7655cdfb5537b2b6ef71e09d284827552050a 100644 (file)
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -58,4 +58,26 @@ uint32_t __div64_32(uint64_t *n, uint32_t base)
 
 EXPORT_SYMBOL(__div64_32);
 
+/* 64bit divisor, dividend and result. dynamic precision */
+uint64_t div64_64(uint64_t dividend, uint64_t divisor)
+{
+       uint32_t d = divisor;
+
+       if (divisor > 0xffffffffULL) {
+               unsigned int shift = fls(divisor >> 32);
+
+               d = divisor >> shift;
+               dividend >>= shift;
+       }
+
+       /* avoid 64 bit division if possible */
+       if (dividend >> 32)
+               do_div(dividend, d);
+       else
+               dividend = (uint32_t) dividend / d;
+
+       return dividend;
+}
+EXPORT_SYMBOL(div64_64);
+
 #endif /* BITS_PER_LONG == 32 */