Commit 38a68b98 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

<linux/compiler_types.h>: Add the __signed_scalar_typeof() helper 



Define __signed_scalar_typeof() to declare a signed scalar type, leaving
non-scalar types unchanged.

To be used to clean up the scheduler load-balancing code a bit.

[ mingo: Split off this patch from the scheduler patch. ]

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://patch.msgid.link/20251127154725.413564507@infradead.org
parent 8f0b4cce

include/linux/compiler_types.h

+19 −0
Original line number Diff line number Diff line
@@ -586,6 +586,25 @@ struct ftrace_likely_data { 
			 __scalar_type_to_expr_cases(long long),	\

			 default: (x)))



/*

 * __signed_scalar_typeof(x) - Declare a signed scalar type, leaving

 *			       non-scalar types unchanged.

 */



#define __scalar_type_to_signed_cases(type)				\

		unsigned type:	(signed type)0,				\

		signed type:	(signed type)0



#define __signed_scalar_typeof(x) typeof(				\

		_Generic((x),						\

			 char:	(signed char)0,				\

			 __scalar_type_to_signed_cases(char),		\

			 __scalar_type_to_signed_cases(short),		\

			 __scalar_type_to_signed_cases(int),		\

			 __scalar_type_to_signed_cases(long),		\

			 __scalar_type_to_signed_cases(long long),	\

			 default: (x)))



/* Is this type a native word size -- useful for atomic operations */

#define __native_word(t) \

	(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \