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Message-ID: <20200421105339.GA23380@lst.de>
Date:   Tue, 21 Apr 2020 12:53:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Cornelia Huck <cohuck@...hat.com>, Christoph Hellwig <hch@....de>,
        Stefan Haberland <sth@...ux.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Jens Axboe <axboe@...nel.dk>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: stop using ioctl_by_bdev in the s390 DASD driver

On Tue, Apr 21, 2020 at 12:43:03PM +0200, Christian Borntraeger wrote:
> So 3 MB seems quite a lot for special purpose Linuxes like the zfcp dumper. 

Does the zfcp dumper need DASD support at all?  We don't have to always
build in the DASD core to avoid the strange dasd-specific block_device
operation, but only ensure it is built-in if it is selected at all.

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