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[PATCH] Avoid recursion in lockdep when stack tracer takes locks

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The new dwarf2 unwinder needs to take locks to do backtraces
inside modules. This patch makes sure lockdep which calls
stacktrace is not reentered.

Thanks to Ingo for suggesting this simpler approach.

Cc: mingo@elte.hu
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:34 +02:00 committed by Andi Kleen
parent 5a1b3999d6
commit 3fa7c794fe
1 changed files with 4 additions and 0 deletions
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4
kernel/lockdep.c
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@ -227,7 +227,11 @@ static int save_trace(struct stack_trace *trace)
trace->skip = 3;
trace->all_contexts = 0;
/* Make sure to not recurse in case the the unwinder needs to tak
e locks. */
lockdep_off();
save_stack_trace(trace, NULL);
lockdep_on();
trace->max_entries = trace->nr_entries;