linux-kernel - Re: [PATCH v2 2/5] mutex: Modify the way optimistic spinners are queued

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Message-ID: <1390943840.11839.10.camel@buesod1.americas.hpqcorp.net>
Date:	Tue, 28 Jan 2014 13:17:20 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Jason Low <jason.low2@...com>, mingo@...hat.com,
	peterz@...radead.org, Waiman.Long@...com,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, riel@...hat.com,
	akpm@...ux-foundation.org, hpa@...or.com, andi@...stfloor.org,
	aswin@...com, scott.norton@...com, chegu_vinod@...com
Subject: Re: [PATCH v2 2/5] mutex: Modify the way optimistic spinners are
 queued

On Tue, 2014-01-28 at 12:23 -0800, Paul E. McKenney wrote:
> On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> > ...
> >  		if (!owner && (need_resched() || rt_task(task)))
> > -			goto slowpath;
> > +			break;
> > 
> >  		/*
> >  		 * The cpu_relax() call is a compiler barrier which forces
> > @@ -514,6 +511,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
> >  		 */
> >  		arch_mutex_cpu_relax();
> >  	}
> > +	mspin_unlock(MLOCK(lock), &node);
> >  slowpath:
> 
> Are there any remaining goto statements to slowpath?  If so, they need
> to release the lock.  If not, this label should be removed.

We still have the !mutex_can_spin_on_owner case.

Thanks,
Davidlohr

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