On 6/11/24 2:19 PM, Christoph Hellwig wrote:

Move the poll flag into the queue_limits feature field so that it
can be set atomically and all I/O is frozen when changing the flag.

Stacking drivers are simplified in that they now can simply set the
flag, and blk_stack_limits will clear it when the features is not
supported by any of the underlying devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Kind of the same remark as for io_stat about this not really being a device
feature. But I guess seeing "features" as a queue feature rather than just a
device feature makes it OK to have poll (and io_stat) as a feature rather than
a flag.

So:

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>

-- 
Damien Le Moal
Western Digital Research