[PATCH v3 2/3] mutex: add support for wound/wait style locks, v3

[Peter Zijlstra]

On Wed, May 22, 2013 at 06:49:04PM +0200, Daniel Vetter wrote:
> - _slow functions can check whether all acquire locks have been
> released and whether the caller is indeed blocking on the contending
> lock. Not doing so could either result in needless spinning instead of
> blocking (when blocking on the wrong lock) or in deadlocks (when not
> dropping all acquired).

We could add ww_mutex_assert_context_empty() or somesuch so that
paranoid people have a means of expressing themselves :-)