The patch titled
kernel.h: add {min,max}3 macros
has been added to the -mm tree. Its filename is
kernelh-add-minmax3-macros.patch
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Subject: kernel.h: add {min,max}3 macros
From: Hagen Paul Pfeifer <hagen@xxxxxxxx>
Introduce two additional min/max macros to compare three operands. This
will save some cycles as well as some bytes on the stack and last but not
least more pleasing as macro nesting.
Signed-off-by: Hagen Paul Pfeifer <hagen@xxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Roland Dreier <rolandd@xxxxxxxxx>
Cc: Sean Hefty <sean.hefty@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kernel.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN include/linux/kernel.h~kernelh-add-minmax3-macros include/linux/kernel.h
--- a/include/linux/kernel.h~kernelh-add-minmax3-macros
+++ a/include/linux/kernel.h
@@ -640,6 +640,22 @@ static inline void ftrace_dump(enum ftra
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
+#define min3(x, y, z) ({ \
+ typeof(x) _min1 = (x); \
+ typeof(y) _min2 = (y); \
+ typeof(z) _min3 = (z); \
+ (void) (&_min1 == &_min2 == &_min3); \
+ _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
+ (_min2 < _min3 ? _min2 : _min3); })
+
+#define max3(x, y, z) ({ \
+ typeof(x) _max1 = (x); \
+ typeof(y) _max2 = (y); \
+ typeof(z) _max3 = (z); \
+ (void) (&_max1 == &_max2 == &_max3); \
+ _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
+ (_max2 > _max3 ? _max2 : _max3); })
+
/**
* clamp - return a value clamped to a given range with strict typechecking
* @val: current value
_
Patches currently in -mm which might be from hagen@xxxxxxxx are
kernelh-add-minmax3-macros.patch
replace-nested-max-min-macros-with-maxmin3-macro.patch
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