Re: [PATCH v4 07/14] arm64: Add support for suppressing warning backtraces

On Thu, Mar 13, 2025 at 11:43:22AM +0000, Alessandro Carminati wrote:

diff --git a/arch/arm64/include/asm/bug.h b/arch/arm64/include/asm/bug.h index 28be048db3f6..044c5e24a17d 100644 --- a/arch/arm64/include/asm/bug.h +++ b/arch/arm64/include/asm/bug.h @@ -11,8 +11,14 @@ #include <asm/asm-bug.h> +#ifdef HAVE_BUG_FUNCTION +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC NULL +#endif

#define __BUG_FLAGS(flags) \

• asm volatile (__stringify(ASM_BUG_FLAGS(flags)));

• asm volatile (__stringify(ASM_BUG_FLAGS(flags, %c0)) : : "i" (__BUG_FUNC));

Why is 'i' the right asm constraint to use here? It seems a bit odd to use that for a pointer.

Will