diff options
| -rw-r--r-- | include/linux/compiler_types.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 6ed0612bc143..31416b60eabf 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -213,7 +213,9 @@ struct ftrace_likely_data { /* * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving * non-scalar types unchanged. - * + */ +#if defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900 +/* * We build this out of a couple of helper macros in a vain attempt to * help you keep your lunch down while reading it. */ @@ -235,6 +237,25 @@ struct ftrace_likely_data { __pick_integer_type(x, int, \ __pick_integer_type(x, long, \ __pick_integer_type(x, long long, x)))))) +#else +/* + * If supported, prefer C11 _Generic for better compile-times. As above, 'char' + * is not type-compatible with 'signed char', and we define a separate case. + */ +#define __scalar_type_to_expr_cases(type) \ + unsigned type: (unsigned type)0, \ + signed type: (signed type)0 + +#define __unqual_scalar_typeof(x) typeof( \ + _Generic((x), \ + char: (char)0, \ + __scalar_type_to_expr_cases(char), \ + __scalar_type_to_expr_cases(short), \ + __scalar_type_to_expr_cases(int), \ + __scalar_type_to_expr_cases(long), \ + __scalar_type_to_expr_cases(long long), \ + default: (x))) +#endif /* Is this type a native word size -- useful for atomic operations */ #define __native_word(t) \ |