linux-kernel - Re: [patch 021/104] lib/idr.c: fix rcu related race with idr

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Date:	Wed, 10 Dec 2008 18:33:35 +0100
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Dave Airlie <airlied@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>, alan@...rguk.ukuu.org.uk,
	Clement Calmels <cboulte@...il.com>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Pierre Peiffer <peifferp@...il.com>
Subject: Re: [patch 021/104] lib/idr.c: fix rcu related race with idr_find

Dave Airlie wrote:
> Actually now that I'm starting to wrap my head around it I think it
> might be the fact that I call
> idr_get_new_above with 64, then later with 0. I'm not sure the new
> code is dealing with that case so
> well.
>   
Yes, that's it.
When idr_get_new_above(,,64,) is called, the idr code creates a tree 
with 2 layers, without the entry 0 in layer 1.
This was special-cased [without comments], I missed it.

I've just send you a patch, could you try it?
It passes self tests [including idr_get_new_above and idr_replace].

--
    Manfred
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