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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2023-08-03 16:19:18 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 10:18:59 -0700 |
| commit | 46f12960aad2d48fc6742470f718e147e5c85d06 (patch) | |
| tree | 984dd692094c365a80fd2ae38376185aec1efe9c /include/linux/math.h | |
| parent | 84c10951da91575778cbc3d199cdddea3d42d905 (diff) | |
| download | linux-stable-46f12960aad2d48fc6742470f718e147e5c85d06.tar.gz linux-stable-46f12960aad2d48fc6742470f718e147e5c85d06.tar.bz2 linux-stable-46f12960aad2d48fc6742470f718e147e5c85d06.zip | |
drm/i915: Move abs_diff() to math.h
abs_diff() belongs to math.h. Move it there. This will allow others to
use it.
[andriy.shevchenko@linux.intel.com: add abs_diff() documentation]
Link: https://lkml.kernel.org/r/20230804050934.83223-1-andriy.shevchenko@linux.intel.com
[akpm@linux-foundation.org: fix comment, per Randy]
Link: https://lkml.kernel.org/r/20230803131918.53727-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org> # tty/serial
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> # gpu/ipu-v3
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@gmail.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/math.h')
| -rw-r--r-- | include/linux/math.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/math.h b/include/linux/math.h index 2d388650c556..dd4152711de7 100644 --- a/include/linux/math.h +++ b/include/linux/math.h @@ -156,6 +156,25 @@ __STRUCT_FRACT(u32) ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) /** + * abs_diff - return absolute value of the difference between the arguments + * @a: the first argument + * @b: the second argument + * + * @a and @b have to be of the same type. With this restriction we compare + * signed to signed and unsigned to unsigned. The result is the subtraction + * the smaller of the two from the bigger, hence result is always a positive + * value. + * + * Return: an absolute value of the difference between the @a and @b. + */ +#define abs_diff(a, b) ({ \ + typeof(a) __a = (a); \ + typeof(b) __b = (b); \ + (void)(&__a == &__b); \ + __a > __b ? (__a - __b) : (__b - __a); \ +}) + +/** * reciprocal_scale - "scale" a value into range [0, ep_ro) * @val: value * @ep_ro: right open interval endpoint |