linux-kernel - Re: What still uses the block layer?

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Message-ID: <20071016042104.GA7854@kroah.com>
Date:	Mon, 15 Oct 2007 21:21:04 -0700
From:	Greg KH <greg@...ah.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	david@...g.hm, Rob Landley <rob@...dley.net>,
	Julian Calaby <julian.calaby@...il.com>,
	Theodore Tso <tytso@....edu>,
	James Bottomley <James.Bottomley@...eleye.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Jens Axboe <axboe@...e.de>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Nick Piggin <piggin@...erone.com.au>
Subject: Re: What still uses the block layer?

On Mon, Oct 15, 2007 at 10:04:01PM -0600, Matthew Wilcox wrote:
> On Mon, Oct 15, 2007 at 07:54:22PM -0700, david@...g.hm wrote:
> > do PCI devices reorder their bus numbers spontaniously, or only if you 
> > change the hardware?
> 
> The only system I've had that reordered PCI bus numbers was when I had a
> partitionable system and changed the partitioning.  Not quite "change
> the hardware", but neither was it "spontaneous".  It was certainly
> unexpected (for me).
> 
> Greg probably has quite different examples.

Changing the hardware (adding a new PCI device or removing one) are the
most common times this happens.  But I have seen reports of this
happening when you upgrade/downgrade BIOS versions, and, in some
oops-we-messed-up cases, when we changed things in the kernel.

thanks,

greg k-h
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