tree 22fbc79b5ba286e2add8f995a8cfa9f211200192
parent f9afca4d367b8c915f28d29fcaba7460640403ff
author Jens Axboe <axboe@kernel.dk> 1540840409 -0600
committer Jens Axboe <axboe@kernel.dk> 1541623499 -0700

blk-mq: allow software queue to map to multiple hardware queues

The mapping used to be dependent on just the CPU location, but
now it's a tuple of (type, cpu) instead. This is a prep patch
for allowing a single software queue to map to multiple hardware
queues. No functional changes in this patch.

This changes the software queue count to an unsigned short
to save a bit of space. We can still support 64K-1 CPUs,
which should be enough. Add a check to catch a wrap.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>