diff options
Diffstat (limited to 'include/linux/compiler_attributes.h')
| -rw-r--r-- | include/linux/compiler_attributes.h | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h index 8bdf6e0918c1..c16d4199bf92 100644 --- a/include/linux/compiler_attributes.h +++ b/include/linux/compiler_attributes.h @@ -95,19 +95,6 @@ #endif /* - * Optional: only supported since gcc >= 15 - * Optional: only supported since clang >= 18 - * - * gcc: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896 - * clang: https://github.com/llvm/llvm-project/pull/76348 - */ -#if __has_attribute(__counted_by__) -# define __counted_by(member) __attribute__((__counted_by__(member))) -#else -# define __counted_by(member) -#endif - -/* * Optional: not supported by gcc * Optional: only supported since clang >= 14.0 * @@ -362,6 +349,19 @@ #define __used __attribute__((__used__)) /* + * The __used attribute guarantees that the attributed variable will be + * always emitted by a compiler. It doesn't prevent the compiler from + * throwing 'unused' warnings when it can't detect how the variable is + * actually used. It's a compiler implementation details either emit + * the warning in that case or not. + * + * The combination of both 'used' and 'unused' attributes ensures that + * the variable would be emitted, and will not trigger 'unused' warnings. + * The attribute is applicable for functions, static and global variables. + */ +#define __always_used __used __maybe_unused + +/* * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-warn_005funused_005fresult-function-attribute * clang: https://clang.llvm.org/docs/AttributeReference.html#nodiscard-warn-unused-result */ |