Re: [PATCH -v3 3/8] locking: Introduce smp_acquire__after_ctrl_dep

[Boqun Feng]

On Wed, Jun 01, 2016 at 06:22:55PM +0200, Peter Zijlstra wrote:
> On Wed, Jun 01, 2016 at 09:52:14PM +0800, Boqun Feng wrote:
> > On Tue, May 31, 2016 at 11:41:37AM +0200, Peter Zijlstra wrote:
> 
> > > @@ -292,7 +282,7 @@ static void sem_wait_array(struct sem_ar
> > >  		sem = sma->sem_base + i;
> > >  		spin_unlock_wait(&sem->lock);
> > >  	}
> > > -	ipc_smp_acquire__after_spin_is_unlocked();
> > > +	smp_acquire__after_ctrl_dep();
> > 
> > I wonder whether we can kill this barrier after updating
> > spin_unlock_wait() to ACQUIRE?
> 
> See patch 5 doing that :-)

Oops, right ;-)

Regards,
Boqun

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