Re: [patch -rt 1/2] KVM: use simple waitqueue for vcpu->wq

[Steven Rostedt <rostedt@goodmis.org>]

On Fri, 16 Jan 2015 11:48:46 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> >  static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >  {
> > -	DEFINE_WAIT(wait);
> > +	DEFINE_SWAITER(wait);
> >  
> > -	prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
> > +	swait_prepare(&vc->wq, &wait, TASK_INTERRUPTIBLE);
> >  	vc->vcore_state = VCORE_SLEEPING;
> >  	spin_unlock(&vc->lock);
> >  	schedule();
> > -	finish_wait(&vc->wq, &wait);
> > +	swait_finish(&vc->wq, &wait);
> >  	spin_lock(&vc->lock);
> >  	vc->vcore_state = VCORE_INACTIVE;
> >  }
> > @@ -1613,7 +1613,7 @@
> >  			kvmppc_create_dtl_entry(vcpu, vc);
> >  			kvmppc_start_thread(vcpu);
> >  		} else if (vc->vcore_state == VCORE_SLEEPING) {
> > -			wake_up(&vc->wq);
> > +			swait_wake(&vc->wq);
> 
> I notice everywhere you have a swait_wake_interruptible() but here. Is
> there a reason why?
> 

Of course I could have misread this patch, and this specific work queue
will only be woken up by swait_wake() and not
swait_wake_interruptible(). If that's the case, then its fine as is
(except for that typo I pointed out before).

-- Steve