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author Tejun Heo <htejun@gmail.com> 1190520852 +0900
committer Jeff Garzik <jeff@garzik.org> 1192215340 -0400

libata-pmp-prep: add PMP related constants, fields, ops and update helpers

Add PMP related constants, fields and ops.  Also, update
ata_class_enabled/disabled() such that PMP classes are considered.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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