diff options
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 621f23d5ae30..406746666eb7 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -2,18 +2,28 @@ #ifndef _ASM_S390_FTRACE_H #define _ASM_S390_FTRACE_H -#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR #define ARCH_SUPPORTS_FTRACE_OPS 1 #define MCOUNT_INSN_SIZE 6 #ifndef __ASSEMBLY__ +#include <asm/stacktrace.h> -#ifdef CONFIG_CC_IS_CLANG -/* https://llvm.org/pr41424 */ -#define ftrace_return_address(n) 0UL -#else -#define ftrace_return_address(n) __builtin_return_address(n) -#endif +static __always_inline unsigned long return_address(unsigned int n) +{ + struct stack_frame *sf; + + if (!n) + return (unsigned long)__builtin_return_address(0); + + sf = (struct stack_frame *)current_frame_address(); + do { + sf = (struct stack_frame *)sf->back_chain; + if (!sf) + return 0; + } while (--n); + return sf->gprs[8]; +} +#define ftrace_return_address(n) return_address(n) void ftrace_caller(void); |