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authorSoren Brinkmann <soren.brinkmann@xilinx.com>2013-11-21 13:38:53 -0800
committerMichal Simek <michal.simek@xilinx.com>2014-02-19 09:41:21 +0100
commit23d5c738664918b1cb11cfffe5fbd79940d68c49 (patch)
tree012b2ee2026a3116af793089a70351d470ec475f /include/common.h
parentbf83495040fcf273eba534f7c2c0cb2325d2240c (diff)
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common: Provide DIV_ROUND_CLOSEST macro
Provide the DIV_ROUND_CLOSEST macro - taken from the Linux kernel - in common.h Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'include/common.h')
-rw-r--r--include/common.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h
index 221b776..ea3e5ed 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))