linux-kernel - Re: [PATCH v2] slub: Do not assert not having lock in removing freed partial

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Date:	Thu, 6 Feb 2014 09:36:40 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, penberg@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2] slub: Do not assert not having lock in removing freed
 partial

On Thu, 6 Feb 2014, Vladimir Davydov wrote:

> > @@ -2906,12 +2916,10 @@ static void early_kmem_cache_node_alloc(
> >  	inc_slabs_node(kmem_cache_node, node, page->objects);
> >
> >  	/*
> > -	 * the lock is for lockdep's sake, not for any actual
> > -	 * race protection
> > +	 * No locks need to be taken here as it has just been
> > +	 * initialized and there is no concurrent access.
> >  	 */
> > -	spin_lock(&n->list_lock);
> > -	add_partial(n, page, DEACTIVATE_TO_HEAD);
> > -	spin_unlock(&n->list_lock);
> > +	__add_partial(n, page, DEACTIVATE_TO_HEAD);
> >  }

Ahh.. Much better.

Acked-by: Christoph Lameter <cl@...ux.com>

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