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Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft

from [Linus Torvalds] [Permanent Link][Original]
To: Nick Piggin <npiggin@xxxxxxx>
Subject: Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup - is this XFS problem?)
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 5 Jan 2009 18:29:41 -0800 (PST)
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Peter Klotz <peter.klotz@xxxxxx>, stable@xxxxxxxxxx, Linux Memory Management List <linux-mm@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Roman Kononov <kernel@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20090106020550.GA819@wotan.suse.de>
References: <20090105041959.GC367@wotan.suse.de> <20090105064838.GA5209@wotan.suse.de> <49623384.2070801@aon.at> <20090105164135.GC32675@wotan.suse.de> <alpine.LFD.2.00.0901050859430.3057@localhost.localdomain> <20090105180008.GE32675@wotan.suse.de> <alpine.LFD.2.00.0901051027011.3057@localhost.localdomain> <20090105201258.GN6959@linux.vnet.ibm.com> <alpine.LFD.2.00.0901051224110.3057@localhost.localdomain> <20090105215727.GQ6959@linux.vnet.ibm.com> <20090106020550.GA819@wotan.suse.de>
User-agent: Alpine 2.00 (LFD 1167 2008-08-23) 

On Tue, 6 Jan 2009, Nick Piggin wrote:
> 
> Sticking an rcu_dereference in radix_tree_deref_slot seems to fix the
> assembly for me too, I grafted the changelog onto that. Linus probably
> you are using -Os?

Ahh, yes. I am. That explains why I can't see any difference.

                Linus
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