blk-mq: enable polling support by default
Now that applications need to explicitly ask for polling we can enable it by default in blk-mq drivers. Note that this will only have an affect on driver that supply a poll function, which currently only includes nvme. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NStephen Bates <stephen.bates@pmcs.com> Tested-by: NStephen Bates <stephen.bates@pmcs.com> Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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