[LIB]: div64_64 optimization

Minor optimization of div64_64.  do_div() already does optimization
for the case of 32 by 32 divide, so no need to do it here.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 9 deletions

diff --git a/lib/div64.c b/lib/div64.c
index c3d7655cdfb5..74f0c8cb4031 100644
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -61,20 +61,18 @@ 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;
+        uint32_t high, d;
 
-        if (divisor > 0xffffffffULL) {
-                unsigned int shift = fls(divisor >> 32);
+        high = divisor >> 32;
+        if (high) {
+                unsigned int shift = fls(high);
 
                 d = divisor >> shift;
                 dividend >>= shift;
-        }
+        } else
+                d = divisor;
 
-        /* avoid 64 bit division if possible */
-        if (dividend >> 32)
-                do_div(dividend, d);
-        else
-                dividend = (uint32_t) dividend / d;
+        do_div(dividend, d);
 
         return dividend;
 }