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

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Date:	Wed, 10 Dec 2008 10:43:07 +1000
From:	"Dave Airlie" <airlied@...il.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Greg KH" <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, "Justin Forbes" <jmforbes@...uxtx.org>,
	"Zwane Mwaikambo" <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	"Randy Dunlap" <rdunlap@...otime.net>,
	"Dave Jones" <davej@...hat.com>,
	"Chuck Wolber" <chuckw@...ntumlinux.com>,
	"Chris Wedgwood" <reviews@...cw.f00f.org>,
	"Michael Krufky" <mkrufky@...uxtv.org>,
	"Chuck Ebbert" <cebbert@...hat.com>,
	"Domenico Andreoli" <cavokz@...il.com>, "Willy Tarreau" <w@....eu>,
	"Rodrigo Rubira Branco" <rbranco@...checkpoint.com>,
	"Jake Edge" <jake@....net>, "Eugene Teo" <eteo@...hat.com>,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Manfred Spraul" <manfred@...orfullife.com>,
	"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

On Wed, Dec 10, 2008 at 8:47 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
>
> On Wed, 10 Dec 2008, Dave Airlie wrote:
>>
>> On Thu, Dec 4, 2008 at 5:49 AM, Greg KH <gregkh@...e.de> wrote:
>> > 2.6.27-stable review patch.  If anyone has any objections, please let us know.
>> >
>> Revert.
>>
>> This caused problems in the F10 kernel with idr, the drm device alloc
>> went all wierd,
>> it might be a drm bug but changing this code triggers it and so it
>> isn't really "stable"
>
> Well, maybe it should be reverted in mainlne too, then?

It appears idr_replace is broken at least in stable with this patch.

I'm trying to track down where the problem is (idr_replace doesn't look like
idr_find in a lot of places and I wonder if this has ever been tested.)

Dave.
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