[PATCH 1/2] Create a DIV_ROUND_CLOSEST macro to do division with rounding

["Darrick J. Wong" <djwong@us.ibm.com>]

Create a helper macro to divide two numbers and round the result to the
nearest whole number.  This is a helper macro for hwmon drivers that
want to convert incoming sysfs values per standard hwmon practice, though
the macro itself can be used by anyone.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---

 include/linux/kernel.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index fba141d..fb02266 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -48,6 +48,12 @@ extern const char linux_proc_banner[];
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
+#define DIV_ROUND_CLOSEST(x, divisor)(			\
+{							\
+	typeof(divisor) __divisor = divisor;		\
+	(((x) + ((__divisor) / 2)) / (__divisor));	\
+}							\
+)
 
 #define _RET_IP_		(unsigned long)__builtin_return_address(0)
 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })