lockdep: Fix backtraces
Truncate stupid -1 entries in backtraces.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1248096665.15751.8816.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 1cedb00..2f09702 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -367,11 +367,21 @@
save_stack_trace(trace);
+ /*
+ * Some daft arches put -1 at the end to indicate its a full trace.
+ *
+ * <rant> this is buggy anyway, since it takes a whole extra entry so a
+ * complete trace that maxes out the entries provided will be reported
+ * as incomplete, friggin useless </rant>
+ */
+ if (trace->entries[trace->nr_entries-1] == ULONG_MAX)
+ trace->nr_entries--;
+
trace->max_entries = trace->nr_entries;
nr_stack_trace_entries += trace->nr_entries;
- if (nr_stack_trace_entries == MAX_STACK_TRACE_ENTRIES) {
+ if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES-1) {
if (!debug_locks_off_graph_unlock())
return 0;