1 files changed, 6 insertions, 3 deletions

diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index 0a34489a46b6..4205f71a5f0e 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -18,6 +18,8 @@ extern void save_stack_trace_regs(struct pt_regs *regs,
                                   struct stack_trace *trace);
 extern void save_stack_trace_tsk(struct task_struct *tsk,
                                 struct stack_trace *trace);
+extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
+                                         struct stack_trace *trace);
 
 extern void print_stack_trace(struct stack_trace *trace, int spaces);
 extern int snprint_stack_trace(char *buf, size_t size,
@@ -29,12 +31,13 @@ extern void save_stack_trace_user(struct stack_trace *trace);
 # define save_stack_trace_user(trace)              do { } while (0)
 #endif
 
-#else
+#else /* !CONFIG_STACKTRACE */
 # define save_stack_trace(trace)                        do { } while (0)
 # define save_stack_trace_tsk(tsk, trace)               do { } while (0)
 # define save_stack_trace_user(trace)                   do { } while (0)
 # define print_stack_trace(trace, spaces)               do { } while (0)
 # define snprint_stack_trace(buf, size, trace, spaces)  do { } while (0)
-#endif
+# define save_stack_trace_tsk_reliable(tsk, trace)      ({ -ENOSYS; })
+#endif /* CONFIG_STACKTRACE */
 
-#endif
+#endif /* __LINUX_STACKTRACE_H */