linux/kernel.h: import DIV_ROUND_CLOSEST_ULL from Linux

Copied from Linux v4.20-rc7.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index bd88483..a85c15d 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -102,6 +102,18 @@
                (((__x) - ((__d) / 2)) / (__d));        \
 }                                                      \
 )
+/*
+ * Same as above but for u64 dividends. divisor must be a 32-bit
+ * number.
+ */
+#define DIV_ROUND_CLOSEST_ULL(x, divisor)(             \
+{                                                      \
+       typeof(divisor) __d = divisor;                  \
+       unsigned long long _tmp = (x) + (__d) / 2;      \
+       do_div(_tmp, __d);                              \
+       _tmp;                                           \
+}                                                      \
+)
 
 /*
  * Multiplies an integer by a fraction, while avoiding unnecessary