Re: [PATCH v2 1/5] block: annotate bdev_disk_changed() deprecation with a symbol namespace

[Christoph Hellwig]

On Fri, May 26, 2023 at 12:33:32AM -0700, Luis Chamberlain wrote:
> This ensures no other users pop up by mistake easily and provides
> us a with an easy vehicle to do the same with other routines should
> we need it later.

I don't see how this is related to the rest of the seris.  I also don't
think it's a good idea.  The APIs isn't deprecated per se.  It just
should not be called by drivers.  The right thing would be an interface
like

EXPORT_SYMBOL_GPL_FOR(bdev_disk_changed, loop.ko, CONFIG_BLK_DEV_LOOP);
EXPORT_SYMBOL_GPL_FOR(bdev_disk_changed, dasd_mod.ko, CONFIG_DASD);

with the modulo code enforcing that no one but the module this is
explicitly exorted for can use the symbol.