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authorJavi Merino <javi.merino@arm.com>2015-04-16 22:43:45 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-17 16:03:55 +0300
commitf766093ecb647f5a87bfa456715abbbccee547ce (patch)
tree818e47743fc5216fe7647dca2d1d6ca4de78c824 /include/linux/kernel.h
parent675cf53c1deaffadc7b6a0b4afe6cdafec86bedb (diff)
downloadlinux-f766093ecb647f5a87bfa456715abbbccee547ce.tar.xz
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>
Diffstat (limited to 'include/linux/kernel.h')
-rw-r--r--include/linux/kernel.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d6d630d31ef3..3a5b48e52a9e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -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