linux-kernel - Re: [PATCH] block: fix CDROM dependency on BLK

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Date:   Thu, 2 Nov 2017 16:07:00 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hare@...e.com" <hare@...e.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] block: fix CDROM dependency on BLK_DEV

On Thu, Nov 2, 2017 at 3:59 PM, Bart Van Assche <Bart.VanAssche@....com> wrote:
> On Thu, 2017-11-02 at 12:19 +0100, Arnd Bergmann wrote:
>> After the cdrom cleanup, I get randconfig warnings for some configurations:
>>
>> warning: (BLK_DEV_IDECD && BLK_DEV_SR) selects CDROM which has unmet direct dependencies (BLK_DEV)
>
> Hello Arnd,
>
> Since Jens has already queued your patch it's too late to consider alternatives.
> Anyway, since the cdrom driver calls block layer functions directly, have you
> considered the following alternative?
>
> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> index 0dad1d2536f7..e7044c893817 100644
> --- a/drivers/block/Kconfig
> +++ b/drivers/block/Kconfig
> @@ -69,6 +69,7 @@ config AMIGA_Z2RAM
>
>  config CDROM
>         tristate "CD-ROM driver"
> +       depends on BLK_DEV
>         help
>           A CD-ROM is a pre-pressed optical compact disc which contains
>           data. The name is an acronym which stands for "Compact Disc

This doesn't work, the problem is the existing dependency on 'BLK_DEV'
that is implied by
listing CONFIG_CDROM inside of the "if BLK_DEV" section. It would
probably be possible
to move CONFIG_CDROM' outside of this 'if' section and use 'select
BLK_DEV' inside it,
but that in turn would make the Kconfig logic even less intuitive than
it already is.

      Arnd