Add name of functions triggering warning backtraces to the __bug_table object section to enable support for suppressing WARNING backtraces.
To limit image size impact, the pointer to the function name is only added to the __bug_table section if both CONFIG_KUNIT_SUPPRESS_BACKTRACE and CONFIG_DEBUG_BUGVERBOSE are enabled. Otherwise, the __func__ assembly parameter is replaced with a (dummy) NULL parameter to avoid an image size increase due to unused __func__ entries (this is necessary because __func__ is not a define but a virtual variable).
Tested-by: Linux Kernel Functional Testing lkft@linaro.org Acked-by: Dan Carpenter dan.carpenter@linaro.org Cc: Catalin Marinas catalin.marinas@arm.com Cc: Will Deacon will@kernel.org Signed-off-by: Guenter Roeck linux@roeck-us.net --- v2: - Rebased to v6.9-rc1 - Added Tested-by:, Acked-by:, and Reviewed-by: tags - Introduced KUNIT_SUPPRESS_BACKTRACE configuration option v3: - Rebased to v6.9-rc2
arch/arm64/include/asm/asm-bug.h | 29 +++++++++++++++++++---------- arch/arm64/include/asm/bug.h | 8 +++++++- 2 files changed, 26 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/include/asm/asm-bug.h b/arch/arm64/include/asm/asm-bug.h index c762038ba400..c6d22e3cd840 100644 --- a/arch/arm64/include/asm/asm-bug.h +++ b/arch/arm64/include/asm/asm-bug.h @@ -8,36 +8,45 @@ #include <asm/brk-imm.h>
#ifdef CONFIG_DEBUG_BUGVERBOSE -#define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line) -#define __BUGVERBOSE_LOCATION(file, line) \ + +#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE +# define HAVE_BUG_FUNCTION +# define __BUG_FUNC_PTR(func) .long func - .; +#else +# define __BUG_FUNC_PTR(func) +#endif + +#define _BUGVERBOSE_LOCATION(file, func, line) __BUGVERBOSE_LOCATION(file, func, line) +#define __BUGVERBOSE_LOCATION(file, func, line) \ .pushsection .rodata.str,"aMS",@progbits,1; \ 14472: .string file; \ .popsection; \ \ .long 14472b - .; \ + __BUG_FUNC_PTR(func) \ .short line; #else -#define _BUGVERBOSE_LOCATION(file, line) +#define _BUGVERBOSE_LOCATION(file, func, line) #endif
#ifdef CONFIG_GENERIC_BUG
-#define __BUG_ENTRY(flags) \ +#define __BUG_ENTRY(flags, func) \ .pushsection __bug_table,"aw"; \ .align 2; \ 14470: .long 14471f - .; \ -_BUGVERBOSE_LOCATION(__FILE__, __LINE__) \ - .short flags; \ +_BUGVERBOSE_LOCATION(__FILE__, func, __LINE__) \ + .short flags; \ .popsection; \ 14471: #else -#define __BUG_ENTRY(flags) +#define __BUG_ENTRY(flags, func) #endif
-#define ASM_BUG_FLAGS(flags) \ - __BUG_ENTRY(flags) \ +#define ASM_BUG_FLAGS(flags, func) \ + __BUG_ENTRY(flags, func) \ brk BUG_BRK_IMM
-#define ASM_BUG() ASM_BUG_FLAGS(0) +#define ASM_BUG() ASM_BUG_FLAGS(0, .)
#endif /* __ASM_ASM_BUG_H */ 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));
#define BUG() do { \ __BUG_FLAGS(0); \