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Message-ID: <152261526342.30503.10484708592420310318.stgit@warthog.procyon.org.uk> Date: Sun, 01 Apr 2018 21:41:03 +0100 From: David Howells <dhowells@...hat.com> To: linux-kernel@...r.kernel.org Subject: [PATCH 08/45] C++: Implement abs() as an inline template function Implement abs() as an C++ inline template function as that greatly simplifies the source. Signed-off-by: David Howells <dhowells@...hat.com> --- include/linux/kernel.h | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index e779a7487c34..59089f76c7d8 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -246,20 +246,11 @@ extern int _cond_resched(void); * * Return: an absolute value of x. */ -#define abs(x) __abs_choose_expr(x, long long, \ - __abs_choose_expr(x, long, \ - __abs_choose_expr(x, int, \ - __abs_choose_expr(x, short, \ - __abs_choose_expr(x, char, \ - __builtin_choose_expr( \ - __builtin_types_compatible_p(typeof(x), char), \ - (char)({ signed char __x = (x); __x<0?-__x:__x; }), \ - ((void)0))))))) - -#define __abs_choose_expr(x, type, other) __builtin_choose_expr( \ - __builtin_types_compatible_p(typeof(x), signed type) || \ - __builtin_types_compatible_p(typeof(x), unsigned type), \ - ({ signed type __x = (x); __x < 0 ? -__x : __x; }), other) +template<typename T> +static inline T abs(T v) +{ + return v < 0 ? -v : v; +} /** * reciprocal_scale - "scale" a value into range [0, ep_ro)
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