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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>
This commit is contained in:
Peter Zijlstra 2009-07-20 15:27:04 +02:00 committed by Ingo Molnar
parent bbfa26229a
commit 4f84f4330a
1 changed files with 11 additions and 1 deletions
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12
kernel/lockdep.c
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@ -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;