[RESEND PATCH v2 3/3] block: hide back blk_freeze_queue_start and export its blk-mq alias

[Christoph Hellwig]

On Sun, Oct 30, 2022 at 01:26:46PM +0800, Jinlong Chen wrote:
> blk_freeze_queue_start is used internally for universal queue draining and
> externally for blk-mq specific queue freezing. Keep the non-blk-mq name
> private and export a blk-mq alias to users.

I really don't see the point here.  Eventually all of the freezing
should move out of the mq namespace.  But that given that we have
actual technical work pending here I'd suggest to just leave it alone
for now, and just respin a version of patch 1 without the pointless
comment.