linux-kernel - Re: [RFC PATCH 4/5] mtd_blkdevs: scan partitions on mtdblock if FIT

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Date:   Tue, 26 Apr 2022 15:11:15 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-block@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tom Rini <trini@...sulko.com>, Jens Axboe <axboe@...nel.dk>,
        Davidlohr Bueso <dave@...olabs.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [RFC PATCH 4/5] mtd_blkdevs: scan partitions on mtdblock if
 FIT_PARTITION is set

On Tue, Apr 26, 2022 at 06:52:42AM -0700, Christoph Hellwig wrote:
> On Mon, Apr 25, 2022 at 04:00:02PM +0100, Daniel Golle wrote:
> > Enable partition parsers on plain mtdblock devices in case of
> > CONFIG_FIT_PARTITION being selected.
> > 
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> >  drivers/mtd/mtd_blkdevs.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
> > index f7317211146550..e9759c4182f8d5 100644
> > --- a/drivers/mtd/mtd_blkdevs.c
> > +++ b/drivers/mtd/mtd_blkdevs.c
> > @@ -359,7 +359,9 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
> >  	} else {
> >  		snprintf(gd->disk_name, sizeof(gd->disk_name),
> >  			 "%s%d", tr->name, new->devnum);
> > +#ifndef CONFIG_FIT_PARTITION
> >  		gd->flags |= GENHD_FL_NO_PART;
> > +#endif
> 
> This will just recreate the fixed regression, just with the extra
> twist of needіng a completely unrelted config option to trigger it.

Do have any alternative suggestion of how partition scanning could
be (ideally selectively) enabled for mtdblock (and ubiblock) devices?
And why it should be disabled in first place?