MDL_STACKADJ
l->l_md.md_flags |= MDL_STACKADJ;
l->l_md.md_flags &= ~MDL_STACKADJ;
if (l->l_md.md_flags & MDL_STACKADJ) {
l->l_md.md_flags &= ~MDL_STACKADJ;
l->l_md.md_flags |= MDL_STACKADJ;
l->l_md.md_flags &= ~MDL_STACKADJ;
if (l->l_md.md_flags & MDL_STACKADJ) {
l->l_md.md_flags &= ~MDL_STACKADJ;