diff options
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 8ea270fdc7fb..5a3c95b11952 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -81,5 +81,30 @@ static inline void ftrace_generate_call_insn(struct ftrace_insn *insn, #endif } +/* + * Even though the system call numbers are identical for s390/s390x a + * different system call table is used for compat tasks. This may lead + * to e.g. incorrect or missing trace event sysfs files. + * Therefore simply do not trace compat system calls at all. + * See kernel/trace/trace_syscalls.c. + */ +#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS +static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) +{ + return is_compat_task(); +} + +#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME +static inline bool arch_syscall_match_sym_name(const char *sym, + const char *name) +{ + /* + * Skip __s390_ and __s390x_ prefix - due to compat wrappers + * and aliasing some symbols of 64 bit system call functions + * may get the __s390_ prefix instead of the __s390x_ prefix. + */ + return !strcmp(sym + 7, name) || !strcmp(sym + 8, name); +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_FTRACE_H */ |