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

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; })


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