linux-kernel - Re: [PATCH] debugobjects: fix lockdep warning #2

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Date:	Fri, 29 Aug 2008 16:02:07 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Vegard Nossum <vegard.nossum@...il.com>, mingo@...e.hu,
	daniel.blueman@...il.com, clameter@....com,
	torvalds@...ux-foundation.org, rjw@...k.pl,
	linux-kernel@...r.kernel.org, bunk@...nel.org, protasnb@...il.com,
	kernel-testers@...r.kernel.org
Subject: Re: [PATCH] debugobjects: fix lockdep warning #2

On Thu, 28 Aug 2008, Andrew Morton wrote:
> > 
> > The lock is also promoted to irq-safe (suggested by Dan).
> 
> What was the reason for this other change?  I'm sure Dan is a fine chap,
> but we usually prefer a little more justification for changes ;)

I added the info already, when I applied it to the tip-tree.

> > +		/* Now free them */
> > +		hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) {
> > +			hlist_del(&obj->node);
> > +			free_object(obj);
> 
> I suspect that we can avoid the hlist_del() here, perhaps with a little
> effort.
> 
> > +
> > +		/* Now free them */
> > +		hlist_for_each_entry_safe(obj, node, tmp, &freelist, node) {
> > +			hlist_del(&obj->node);
> > +			free_object(obj);
> > +		}
> > +
> 
> and the other one.
> 
> But I'm not sure that it's worth putting effort into - leaving dead
> objects strung onto a partially-live list is a little bit smelly IMO.

I really feel better, when we delete them instead of throwing them
away with pointers to each other.

Thanks,

	tglx
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