summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/ftrace.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
-rw-r--r--arch/s390/include/asm/ftrace.h25
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 */