[PATCH] x86_64: Dump leftover backtrace entries when dwarf2 unwinder got stuck

The dwarf2 unwinder currently often gets stuck because a lot
of assembly code doesn't have proper dwarf2 annotiation yet.

This currently often happens with __down. Should fix this by
adding proper dwarf2 annotation to all inline assembly. However
until that's done we need a quick fix for 2.6.18 to avoid
incomplete backtraces.

So when this happens dump the rest of the stack with the old unwinder
instead of silently not dumping it. There was already a optional
"both" mode that dumped both, but that was too ugly.

I also clarified the headers for the different backtraces a bit.

Also add a clear error message for missing dwarf2
annotation that people can work on.

And I removed a dead variable left over from Ingo's changes.

Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Andi Kleen <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86_64/kernel/traps.c

···
 {
 	const unsigned cpu = safe_smp_processor_id();
 	unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
-	int i = 11;
 	unsigned used = 0;
 
 	printk("\nCall Trace:\n");
···
 			if (unwind_init_blocked(&info, tsk) == 0)
 				unw_ret = show_trace_unwind(&info, NULL);
 		}
-		if (unw_ret > 0) {
-			if (call_trace > 0)
+		if (unw_ret > 0 && !arch_unw_user_mode(&info)) {
+#ifdef CONFIG_STACK_UNWIND
+			unsigned long rip = info.regs.rip;
+			print_symbol("DWARF2 unwinder stuck at %s\n", rip);
+			if (call_trace == 1) {
+				printk("Leftover inexact backtrace:\n");
+				stack = (unsigned long *)info.regs.rsp;
+			} else if (call_trace > 1)
 				return;
-			printk("Legacy call trace:");
-			i = 18;
+			else
+				printk("Full inexact backtrace again:\n");
+#else
+			printk("Inexact backtrace:\n");
+#endif
 		}
 	}
 
···
 		call_trace = -1;
 	else if (strcmp(s, "both") == 0)
 		call_trace = 0;
-	else if (strcmp(s, "new") == 0)
+	else if (strcmp(s, "newfallback") == 0)
 		call_trace = 1;
+	else if (strcmp(s, "new") == 0)
+		call_trace = 2;
 	return 1;
 }
 __setup("call_trace=", call_trace_setup);