[PATCH v3 2/8] mm/hwpoison: don't need to hold compound lock for hugetlbfs page

v1 -> v2: * drop compound_trans_order completely compound lock is introduced by commit e9da73d67("thp: compound_lock."), it is used to serialize put_page against __split_huge_page_refcount(). In addition, transparent hugepages will be splitted in hwpoison handler and just one subpage will be

[PATCH v3 2/8] mm/hwpoison: don't need to hold compound lock for hugetlbfs page

v1 - v2: * drop compound_trans_order completely compound lock is introduced by commit e9da73d67(thp: compound_lock.), it is used to serialize put_page against __split_huge_page_refcount(). In addition, transparent hugepages will be splitted in hwpoison handler and just one subpage will be