[PATCH] i386/x86-64: fall back to old-style call trace if no unwinding
If no unwinding is possible at all for a certain exception instance,
fall back to the old style call trace instead of not showing any trace
at all.
Also, allow setting the stack trace mode at the command line.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/unwind.h b/include/linux/unwind.h
index 0295aa7..13c7b2c 100644
--- a/include/linux/unwind.h
+++ b/include/linux/unwind.h
@@ -49,8 +49,8 @@
* Prepare to unwind the currently running thread.
*/
extern int unwind_init_running(struct unwind_frame_info *,
- asmlinkage void (*callback)(struct unwind_frame_info *,
- void *arg),
+ asmlinkage int (*callback)(struct unwind_frame_info *,
+ void *arg),
void *arg);
/*
@@ -97,8 +97,8 @@
}
static inline int unwind_init_running(struct unwind_frame_info *info,
- asmlinkage void (*cb)(struct unwind_frame_info *,
- void *arg),
+ asmlinkage int (*cb)(struct unwind_frame_info *,
+ void *arg),
void *arg)
{
return -ENOSYS;