BM_DONT_SET
if ((val ? BM_DONT_SET : BM_DONT_CLEAR) & b->bm_flags)
BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED,
const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);