Re: [PATCH v4 3/3] locking/mutex: Ensure forward progress of waiter-spinner

[Waiman Long]

On 08/10/2016 05:29 AM, Peter Zijlstra wrote:
> On Tue, Aug 09, 2016 at 02:00:00PM -0400, Waiman Long wrote:
> > > Alternative might be to use the LSB of mutex::owner, but that's going to
> > > be somewhat icky too.
> > I was thinking about doing that. However, the owner field is used in quite a
> > number of places. It may be a bit risky to change all of them.
> Agreed.

It will be easier to do that for rwsem as the owner field isn't used for 
the debug code, unlike the mutex.

Cheers,
Longman