* Thomas Gleixner <[email protected]> wrote:
> - if (unlikely(!waiter.task))
> + if (unlikely(!waiter.task)) {
> + /*
> + * Reset the return value. We might
> + * have returned with -EDEADLK and the
> + * owner released the lock while we
> + * were walking the pi chain.
> + */
> + ret = 0;
> continue;
> -
> + }
ok - i guess the reason here that we never triggered it in -rt is that
-EDEADLK is a really rare case that only occurs with pi-futexes (and
even then, only with buggy userspace or with intentional testcases).
Plus, lockdep caught most/all of the in-kernel deadlocks before this
mechanism could catch it.
Acked-by: Ingo Molnar <[email protected]>
Ingo
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