diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/compiler-clang.h | 10 | ||||
| -rw-r--r-- | include/linux/compiler_types.h | 9 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h index 49feac0162a5..4c1a39dcb624 100644 --- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -118,3 +118,13 @@ #define __diag_ignore_all(option, comment) \ __diag_clang(13, ignore, option) + +/* + * clang has horrible behavior with "g" or "rm" constraints for asm + * inputs, turning them into something worse than "m". Avoid using + * constraints with multiple possible uses (but "ir" seems to be ok): + * + * https://github.com/llvm/llvm-project/issues/20571 + */ +#define ASM_INPUT_G "ir" +#define ASM_INPUT_RM "r" diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index d1a9dbb8e1a7..93600de3800b 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -409,6 +409,15 @@ struct ftrace_likely_data { #define asm_goto_output(x...) asm volatile goto(x) #endif +/* + * Clang has trouble with constraints with multiple + * alternative behaviors (mainly "g" and "rm"). + */ +#ifndef ASM_INPUT_G + #define ASM_INPUT_G "g" + #define ASM_INPUT_RM "rm" +#endif + #ifdef CONFIG_CC_HAS_ASM_INLINE #define asm_inline asm __inline #else |