Commit 9fe06081 authored Jan 06, 2009 by Darrick J. Wong Committed by Linus Torvalds Jan 06, 2009

Create a DIV_ROUND_CLOSEST macro to do division with rounding



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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 30079677

include/linux/kernel.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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; })