kernel.h: implement DIV_ROUND_CLOSEST_ULL

We have grown a number of different implementations of
DIV_ROUND_CLOSEST_ULL throughout the kernel.  Move the i915 one to
kernel.h so that it can be reused.

Signed-off-by: Javi Merino <javi.merino@arm.com>
Reviewed-by: Jeff Epler <jepler@unpythonic.net>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Guenter Roeck <linux@roeck-us.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Alex Elder <elder@linaro.org>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Javi Merino <javi.merino@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Javi Merino 2015-04-16 12:43:45 -07:00 committed by Linus Torvalds
parent 675cf53c1d
commit f766093ecb
3 changed files with 13 additions and 3 deletions

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@ -36,9 +36,6 @@
#include <drm/drm_dp_mst_helper.h>
#include <drm/drm_rect.h>
#define DIV_ROUND_CLOSEST_ULL(ll, d) \
({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })
/**
* _wait_for - magic (register) wait macro
*

View File

@ -30,6 +30,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include "intel_drv.h"

View File

@ -103,6 +103,18 @@
(((__x) - ((__d) / 2)) / (__d)); \
} \
)
/*
* Same as above but for u64 dividends. divisor must be a 32-bit
* number.
*/
#define DIV_ROUND_CLOSEST_ULL(x, divisor)( \
{ \
typeof(divisor) __d = divisor; \
unsigned long long _tmp = (x) + (__d) / 2; \
do_div(_tmp, __d); \
_tmp; \
} \
)
/*
* Multiplies an integer by a fraction, while avoiding unnecessary