Re: [PATCH v2 1/4] locking/mutex: Add waiter parameter to mutex_optimistic_spin()

[Davidlohr Bueso]

On Sat, 13 Feb 2016, Peter Zijlstra wrote:

> Can't see it do that, also, if it were to do that, we'd not be here
> since having a waiter would then mean no spinners and no starvation
> etc..

I was having a hard time understanding why on earth you didn't see that. And yes
I was also wondering why it was even there... but I was looking at -next, where we
have Ding's original patch b9ce3647b4901071b0dd35d62954a4bb0e5ba1d1.... Paul, could
you drop this patch?

But yeah, I do agree that waiters should also do the mutex_can_spin_on_owner()
check unless I'm missing something subtle from Waiman.

Thanks,
Davidlohr