FYI, it needed the fixlet below.

	Ingo

------------->
commit 7bcebd2e3ee8435e2ff0f674a409f46961fda3cc
Author: Ingo Molnar <mingo@elte.hu>
Date:   Fri Jun 27 21:20:17 2008 +0200

    stacktrace: export print_stack_trace and save_stack_trace
    
    fix:
    
    ERROR: "print_stack_trace" [kernel/backtracetest.ko] undefined!
    ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined!
    
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    
    Conflicts:
    
    Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index c28c342..b7b483b 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -74,10 +74,4 @@ void save_stack_trace(struct stack_trace *trace)
 	if (trace->nr_entries < trace->max_entries)
 		trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
-
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
-{
-	dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
-	if (trace->nr_entries < trace->max_entries)
-		trace->entries[trace->nr_entries++] = ULONG_MAX;
-}
+EXPORT_SYMBOL_GPL(save_stack_trace);
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index 7eaea9d..eda2f4c 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -21,4 +21,5 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
 		print_ip_sym(trace->entries[i]);
 	}
 }
+EXPORT_SYMBOL_GPL(print_stack_trace);
 
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