diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2025-11-27 16:39:44 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-12-14 08:25:02 +0100 |
| commit | 38a68b982dd0b10e3da943f100e034598326eafe (patch) | |
| tree | 7091332f0da70b2fdc70b7a4ad00ac634e96d134 /include | |
| parent | 8f0b4cce4481fb22653697cced8d0d04027cb1e8 (diff) | |
<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: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo 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
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/compiler_types.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 1280693766b9..280b4ac0990f 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -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) || \ |