linux-kernel - Re: [PATCH] block: annotate bdev_disk_changed() deprecation with a symbol namespace

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Message-ID: <ZCIiBHyrzDoTJPXT@bombadil.infradead.org>
Date:   Mon, 27 Mar 2023 16:08:52 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     axboe@...nel.dk, sth@...ux.ibm.com, hoeppner@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        borntraeger@...ux.ibm.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: annotate bdev_disk_changed() deprecation with a
 symbol namespace

On Mon, Mar 27, 2023 at 04:02:02PM -0700, Luis Chamberlain wrote:
> On Mon, Mar 27, 2023 at 03:16:39PM -0700, Christoph Hellwig wrote:
> > What I'd really want is something like an
> > 
> > EXPORT_SYMBOL_FOR(bdev_disk_changed, loop, CONFIG_BLK_DEV_LOOP);
> > EXPORT_SYMBOL_FOR(bdev_disk_changed, dasd_kmod, CONFIG_DASD);
> > 
> > Which ensures that the symbol lookup only succeeds for loop.ko and
> > dasd_kmod.ko, and that the export only happens if the relevant
> > symbols are set.
> 
> I think that could be done, sure.

BTW is anyone aware of similar exports which are stuck in this way?

  Luis