[U-Boot] [PATCH 1/8] common: Provide DIV_ROUND_CLOSEST macro

[Michal Simek]

From: Soren Brinkmann <soren.brinkmann at xilinx.com>

Provide the DIV_ROUND_CLOSEST macro - taken from the Linux kernel - in
common.h

Signed-off-by: Soren Brinkmann <soren.brinkmann at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 include/common.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/common.h b/include/common.h
index d49c514..ae45836 100644
--- a/include/common.h
+++ b/include/common.h
@@ -964,6 +964,22 @@ static inline phys_addr_t map_to_sysmem(const void *ptr)
 #define DIV_ROUND_UP(n,d)	(((n) + (d) - 1) / (d))
 #define roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))

+/*
+ * Divide positive or negative dividend by positive divisor and round
+ * to closest integer. Result is undefined for negative divisors and
+ * for negative dividends if the divisor variable type is unsigned.
+ */
+#define DIV_ROUND_CLOSEST(x, divisor)(			\
+{							\
+	typeof(x) __x = x;				\
+	typeof(divisor) __d = divisor;			\
+	(((typeof(x))-1) > 0 ||				\
+	 ((typeof(divisor))-1) > 0 || (__x) > 0) ?	\
+		(((__x) + ((__d) / 2)) / (__d)) :	\
+		(((__x) - ((__d) / 2)) / (__d));	\
+}							\
+)
+
 #define ALIGN(x,a)		__ALIGN_MASK((x),(typeof(x))(a)-1)
 #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))

--
1.8.2.3

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