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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-07-20 15:27:04 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-02 15:41:31 +0200
commit4f84f4330a11b9eb828bf5af557f4c79c64614a3 (patch)
tree2ff001464083190f67f61fe3766ee2a6eeb8c349
parentbbfa26229a8143889e95e0df4a9d69067ee836cd (diff)
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>
-rw-r--r--kernel/lockdep.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 1cedb00e3e7..2f0970297e3 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -367,11 +367,21 @@ static int save_trace(struct stack_trace *trace)
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;