> @@ -1135,20 +1135,12 @@ void do_page_add_anon_rmap(struct page *page,
> bool compound = flags & RMAP_COMPOUND;
> bool first;
>
> - if (PageTransCompound(page)) {
> + if (compound) {
> + atomic_t *mapcount;
> VM_BUG_ON_PAGE(!PageLocked(page), page);
> - if (compound) {
> - atomic_t *mapcount;
> -
> - VM_BUG_ON_PAGE(!PageTransHuge(page), page);
> - mapcount = compound_mapcount_ptr(page);
> - first = atomic_inc_and_test(mapcount);
> - } else {
> - /* Anon THP always mapped first with PMD */
> - first = 0;
> - VM_BUG_ON_PAGE(!page_mapcount(page), page);
> - atomic_inc(&page->_mapcount);
> - }
> + VM_BUG_ON_PAGE(!PageTransHuge(page), page);
> + mapcount = compound_mapcount_ptr(page);
> + first = atomic_inc_and_test(mapcount);
> } else {
> VM_BUG_ON_PAGE(compound, page);
Then this debug info is no longer needed.
> first = atomic_inc_and_test(&page->_mapcount);
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