mm: convert destroy_compound_page() to destroy_large_folio()

All callers now have a folio, so push the folio->page conversion
down to this function.

[akpm@linux-foundation.org: uninline destroy_large_folio() to fix build issue]
Link: https://lkml.kernel.org/r/20220617175020.717127-20-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/mm.h

@@ -892,11 +892,7 @@ static inline void set_compound_page_dtor(struct page *page,
 	page[1].compound_dtor = compound_dtor;
 }
 
-static inline void destroy_compound_page(struct page *page)
-{
-	VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page);
-	compound_page_dtors[page[1].compound_dtor](page);
-}
+void destroy_large_folio(struct folio *folio);
 
 static inline int head_compound_pincount(struct page *head)
 {

mm/page_alloc.c

@@ -744,6 +744,14 @@ void prep_compound_page(struct page *page, unsigned int order)
 	prep_compound_head(page, order);
 }
 
+void destroy_large_folio(struct folio *folio)
+{
+	enum compound_dtor_id dtor = folio_page(folio, 1)->compound_dtor;
+
+	VM_BUG_ON_FOLIO(dtor >= NR_COMPOUND_DTORS, folio);
+	compound_page_dtors[dtor](&folio->page);
+}
+
 #ifdef CONFIG_DEBUG_PAGEALLOC
 unsigned int _debug_guardpage_minorder;
 

mm/swap.c

@@ -115,7 +115,7 @@ static void __folio_put_large(struct folio *folio)
 	 */
 	if (!folio_test_hugetlb(folio))
 		__page_cache_release(folio);
-	destroy_compound_page(&folio->page);
+	destroy_large_folio(folio);
 }
 
 void __folio_put(struct folio *folio)

mm/vmscan.c

@@ -1979,7 +1979,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
 		 * appear not as the counts should be low
 		 */
 		if (unlikely(folio_test_large(folio)))
-			destroy_compound_page(&folio->page);
+			destroy_large_folio(folio);
 		else
 			list_add(&folio->lru, &free_pages);
 		continue;
@@ -2348,7 +2348,7 @@ static unsigned int move_pages_to_lru(struct lruvec *lruvec,
 
 			if (unlikely(folio_test_large(folio))) {
 				spin_unlock_irq(&lruvec->lru_lock);
-				destroy_compound_page(&folio->page);
+				destroy_large_folio(folio);
 				spin_lock_irq(&lruvec->lru_lock);
 			} else
 				list_add(&folio->lru, &folios_to_free);