ahci: add ncq debug checks
Most of the time, these bits can be safely ignored. For the purposes of debugging however, it's nice to know that they're not being used. Signed-off-by: NJohn Snow <jsnow@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-id: 1435016308-6150-7-git-send-email-jsnow@redhat.com
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