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 Signed-off-by: Guenter Roeck linux@roeck-us.net --- - Rebased to v6.9-rc1; resolved context conflict - Added Tested-by:, Acked-by:, and Reviewed-by: tags - Introduced KUNIT_SUPPRESS_BACKTRACE configuration option
arch/loongarch/include/asm/bug.h | 38 +++++++++++++++++++++++--------- 1 file changed, 27 insertions(+), 11 deletions(-)
diff --git a/arch/loongarch/include/asm/bug.h b/arch/loongarch/include/asm/bug.h index 08388876ade4..193f396d81a0 100644 --- a/arch/loongarch/include/asm/bug.h +++ b/arch/loongarch/include/asm/bug.h @@ -3,47 +3,63 @@ #define __ASM_BUG_H
#include <asm/break.h> +#include <kunit/bug.h> #include <linux/stringify.h>
#ifndef CONFIG_DEBUG_BUGVERBOSE -#define _BUGVERBOSE_LOCATION(file, line) +#define _BUGVERBOSE_LOCATION(file, func, line) #else -#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 /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */ + +#define __BUGVERBOSE_LOCATION(file, func, line) \ .pushsection .rodata.str, "aMS", @progbits, 1; \ 10002: .string file; \ .popsection; \ \ .long 10002b - .; \ + __BUG_FUNC_PTR(func) \ .short line; -#define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line) +#define _BUGVERBOSE_LOCATION(file, func, line) __BUGVERBOSE_LOCATION(file, func, line) #endif
#ifndef CONFIG_GENERIC_BUG -#define __BUG_ENTRY(flags) +#define __BUG_ENTRY(flags, func) #else -#define __BUG_ENTRY(flags) \ +#define __BUG_ENTRY(flags, func) \ .pushsection __bug_table, "aw"; \ .align 2; \ 10000: .long 10001f - .; \ - _BUGVERBOSE_LOCATION(__FILE__, __LINE__) \ + _BUGVERBOSE_LOCATION(__FILE__, func, __LINE__) \ .short flags; \ .popsection; \ 10001: #endif
-#define ASM_BUG_FLAGS(flags) \ - __BUG_ENTRY(flags) \ +#define ASM_BUG_FLAGS(flags, func) \ + __BUG_ENTRY(flags, func) \ break BRK_BUG
-#define ASM_BUG() ASM_BUG_FLAGS(0) +#define ASM_BUG() ASM_BUG_FLAGS(0, .) + +#ifdef HAVE_BUG_FUNCTION +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC NULL +#endif
#define __BUG_FLAGS(flags) \ - asm_inline volatile (__stringify(ASM_BUG_FLAGS(flags))); + asm_inline volatile (__stringify(ASM_BUG_FLAGS(flags, %0)) : : "i" (__BUG_FUNC));
#define __WARN_FLAGS(flags) \ do { \ instrumentation_begin(); \ - __BUG_FLAGS(BUGFLAG_WARNING|(flags)); \ + if (!IS_SUPPRESSED_WARNING(__func__)) \ + __BUG_FLAGS(BUGFLAG_WARNING|(flags)); \ annotate_reachable(); \ instrumentation_end(); \ } while (0)