linux-kernel - Re: [PATCH 17/17] BLOCK: Make it possible to disable the block layer [try #2]

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Date:	Tue, 29 Aug 2006 13:25:01 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	zippel@...ux-m68k.org
Subject: Re: [PATCH 17/17] BLOCK: Make it possible to disable the block layer [try #2]

On Tue, Aug 29, 2006 at 01:23:18PM +0100, David Howells wrote:
> Christoph Hellwig <hch@...radead.org> wrote:
> 
> > Same as above.  USB_STORAGE already selects scsi so it shouldn't need
> > to depend on block.
> 
> Ah, you've got it the wrong way round.
> 
> Because USB_STORAGE _selects_ SCSI rather than depending on it, even if SCSI
> is disabled, USB_STORAGE can be enabled, and that turns on CONFIG_SCSI, even
> if not all of its dependencies are available.
> 
> Run "make allyesconfig" and then try to turn off CONFIG_SCSI without this...

Eeek.  The easy fix is to change USB_STORAGE to depend on SCSI (*), but in
addition to that we should probably fix Kconfig aswell to adhere to
such constraints.


(*) that selects is really wrong to start with, the other scsi drivers don't
    select scsi either.
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