Hi all, Here be the 5th iteration of these patches; which strive to unlock the rt_mutex without holding hb->lock.
In total this patch-set is very much like the previous one (including the 'late' fix) but it gets there in a slightly different -- and hopefully easier to understand -- route. The last 3 patches could be superfluous if we can proof that the -EAGAIN retry in futex_unlock_pi() isn't a problem for bounded execution (or are willing to accept it). In this case the patch-set ends up simpler than before. I sincerely hope this is the last of it; but please consider carefully, there be dragons here.
