kernel.h: add {min,max}3 macros
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. [akpm@linux-foundation.org: fix warnings] Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net> Cc: Joe Perches <joe@perches.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Hartley Sweeten <hsweeten@visionengravers.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Roland Dreier <rolandd@cisco.com> Cc: Sean Hefty <sean.hefty@intel.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -651,6 +651,24 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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#define min3(x, y, z) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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typeof(z) _min3 = (z); \
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(void) (&_min1 == &_min2); \
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(void) (&_min1 == &_min3); \
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_min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
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(_min2 < _min3 ? _min2 : _min3); })
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#define max3(x, y, z) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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typeof(z) _max3 = (z); \
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(void) (&_max1 == &_max2); \
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(void) (&_max1 == &_max3); \
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_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
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(_max2 > _max3 ? _max2 : _max3); })
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/**
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* min_not_zero - return the minimum that is _not_ zero, unless both are zero
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* @x: value1
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