MD_HAS_MULTIPLE_PPLS
if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags))
(1L << MD_HAS_MULTIPLE_PPLS) | \
(1L << MD_HAS_MULTIPLE_PPLS))
clear_bit(MD_HAS_MULTIPLE_PPLS, &ppl_conf->mddev->flags);
set_bit(MD_HAS_MULTIPLE_PPLS,
clear_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags);