linux-kernel - Re: [PATCH 03/13] nvdimm/btt: do not call del

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Message-ID: <YYFvdiOYoqRPx8JE@bombadil.infradead.org>
Date:   Tue, 2 Nov 2021 10:03:50 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Geoff Levand <geoff@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, Jim Paris <jim@...n.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>, senozhatsky@...omium.org,
        Richard Weinberger <richard@....at>, miquel.raynal@...tlin.com,
        vigneshr@...com, Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, linux-block@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-mtd@...ts.infradead.org,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        linux-nvme@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/13] nvdimm/btt: do not call del_gendisk() if not needed

On Sun, Oct 31, 2021 at 10:47:22AM -0700, Dan Williams wrote:
> On Fri, Oct 15, 2021 at 4:53 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
> >
> > We know we don't need del_gendisk() if we haven't added
> > the disk, so just skip it. This should fix a bug on older
> > kernels, as del_gendisk() became able to deal with
> > disks not added only recently, after the patch titled
> > "block: add flag for add_disk() completion notation".
> 
> Perhaps put this in:
> 
>     commit $abbrev_commit ("block: add flag for add_disk() completion notation")
> 
> ...format, but I can't seem to find that commit?

Indeed, that patch got dropped and it would seem Christoph preferred
a simpler approach with the new disk_live()

commit 40b3a52ffc5bc3b5427d5d35b035cfb19d03fdd6
Author: Christoph Hellwig <hch@....de>
Date:   Wed Aug 18 16:45:32 2021 +0200

    block: add a sanity check for a live disk in del_gendisk

> If you're touching the changelog how about one that clarifies the
> impact and drops "we"?
> "del_gendisk() is not required if the disk has not been added. On
> kernels prior to commit $abbrev_commit ("block: add flag for
> add_disk() completion notation")
> it is mandatory to not call del_gendisk() if the underlying device has
> not been through device_add()."
> 
> Fixes: 41cd8b70c37a ("libnvdimm, btt: add support for blk integrity")
> 
> With that you can add:
> 
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>

You got it.

  Luis