Messages in this thread Patch in this message | | | From | Hagen Paul Pfeifer <> | Subject | [PATCH 1/2] kernel.h: add {min,max}3 macros | Date | Thu, 19 Aug 2010 19:18:18 +0200 |
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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@jauu.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Joe Perches <joe@perches.com> Cc: Ingo Molnar <mingo@elte.hu> --- include/linux/kernel.h | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 2b0a35e..9a9b52c 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -640,6 +640,22 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } (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 -- 1.7.2.1.95.g3d045.dirty
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