Re: [PATCH] locking/mutex: Set and clear owner using WRITE_ONCE()

[Waiman Long]

On 05/20/2016 09:00 PM, Davidlohr Bueso wrote:
> On Fri, 20 May 2016, Waiman Long wrote:
>
> > I think mutex-debug.h also needs similar changes for completeness.
>
> Maybe, but given that with debug the wait_lock is unavoidable, doesn't
> this send the wrong message?
>
> Thanks,
> Davidlohr

You are right. Optimistic spinning is disabled when DEBUG_MUTEXES is 
true. So WRITE_ONCE() is not really needed. However, I think we should 
have at least a comment in mutex-debug.h as to why the owner field is 
handled differently from mutex.h.

Cheers,
Longman