The patch titled
Subject: math.h: document abs_diff()
has been added to the -mm mm-nonmm-unstable branch. Its filename is
drm-i915-move-abs_diff-to-mathh-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/drm-i915-move-abs_diff-to-mathh-fix.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Subject: math.h: document abs_diff()
Date: Fri, 4 Aug 2023 08:09:34 +0300
Initially abs_diff() has lack of documentation. Add it.
Link: https://lkml.kernel.org/r/20230804050934.83223-1-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/math.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/include/linux/math.h~drm-i915-move-abs_diff-to-mathh-fix
+++ a/include/linux/math.h
@@ -155,6 +155,18 @@ __STRUCT_FRACT(u32)
__builtin_types_compatible_p(typeof(x), unsigned type), \
({ 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 has 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); \
_
Patches currently in -mm which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are
kernelh-split-out-count_args-and-concatenate-to-argsh.patch
x86-asm-replace-custom-count_args-concatenate-implementations.patch
arm64-smccc-replace-custom-count_args-concatenate-implementations.patch
genetlink-replace-custom-concatenate-implementation.patch
drm-i915-move-abs_diff-to-mathh.patch
drm-i915-move-abs_diff-to-mathh-fix.patch
