Add a do_div() wrapper macro, lldiv().

Add a do_div() wrapper, lldiv(). The new inline function doesn't modify
the dividend and returns the result of division, so it is useful
in complex expressions, i.e. "return(a/b)" -> "return(lldiv(a,b))"

Signed-off-by: Sergei Poselenov <sposelenov@emcraft.com>

include/div64.h

@@ -36,4 +36,14 @@ extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
 	__rem;						\
  })
 
+/* Wrapper for do_div(). Doesn't modify dividend and returns
+ * the result, not reminder.
+ */
+static inline uint64_t lldiv(uint64_t dividend, uint32_t divisor)
+{
+	uint64_t __res = dividend;
+	do_div(__res, divisor);
+	return(__res);
+}
+
 #endif /* _ASM_GENERIC_DIV64_H */