sbitmap: introduce __sbitmap_for_each_set()
For blk-mq, we need to be able to iterate software queues starting from any queue in a round robin fashion, so introduce this helper. Reviewed-by: Omar Sandoval <osandov@fb.com> Cc: Omar Sandoval <osandov@fb.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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