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Date: Tue, 3 Jun 2003 12:07:17 -0700
From: Andrew Morton <akpm@digeo.com>
To: Lou Langholtz <ldl@aros.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.70 add_disk(disk) re-registering disk->queue->elevator.kobj
 (bug?!)
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Lou Langholtz <ldl@aros.net> wrote:
>
> Or perhaps the block 
> handling logic was changed such that disks don't share the same 
> request_queue anymore. If so, then a few drivers (like nbd) need to be 
> updated to use a seperate request_queue per disk.

The ramdisk driver was recently changed to do exactly this.  From what
you say it appears that nbd needs the same treatment.