mm: add folio_add_lru_vma()

Convert lru_cache_add_inactive_or_unevictable() to folio_add_lru_vma()
and add a compatibility wrapper.

Link: https://lkml.kernel.org/r/20220902194653.1739778-6-willy@infradead.orgSigned-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/swap.h

@@ -379,11 +379,11 @@ extern unsigned long totalreserve_pages;
 
 
 /* linux/mm/swap.c */
-extern void lru_note_cost(struct lruvec *lruvec, bool file,
-			  unsigned int nr_pages);
-extern void lru_note_cost_folio(struct folio *);
-extern void folio_add_lru(struct folio *);
-extern void lru_cache_add(struct page *);
+void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages);
+void lru_note_cost_folio(struct folio *);
+void folio_add_lru(struct folio *);
+void folio_add_lru_vma(struct folio *, struct vm_area_struct *);
+void lru_cache_add(struct page *);
 void mark_page_accessed(struct page *);
 void folio_mark_accessed(struct folio *);
 

mm/folio-compat.c

@@ -88,6 +88,12 @@ void lru_cache_add(struct page *page)
 }
 EXPORT_SYMBOL(lru_cache_add);
 
+void lru_cache_add_inactive_or_unevictable(struct page *page,
+		struct vm_area_struct *vma)
+{
+	folio_add_lru_vma(page_folio(page), vma);
+}
+
 int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 		pgoff_t index, gfp_t gfp)
 {

mm/swap.c

@@ -537,22 +537,21 @@ void folio_add_lru(struct folio *folio)
 EXPORT_SYMBOL(folio_add_lru);
 
 /**
- * lru_cache_add_inactive_or_unevictable
- * @page:  the page to be added to LRU
- * @vma:   vma in which page is mapped for determining reclaimability
+ * folio_add_lru_vma() - Add a folio to the appropate LRU list for this VMA.
+ * @folio: The folio to be added to the LRU.
+ * @vma: VMA in which the folio is mapped.
  *
- * Place @page on the inactive or unevictable LRU list, depending on its
- * evictability.
+ * If the VMA is mlocked, @folio is added to the unevictable list.
+ * Otherwise, it is treated the same way as folio_add_lru().
  */
-void lru_cache_add_inactive_or_unevictable(struct page *page,
-					 struct vm_area_struct *vma)
+void folio_add_lru_vma(struct folio *folio, struct vm_area_struct *vma)
 {
-	VM_BUG_ON_PAGE(PageLRU(page), page);
+	VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
 
 	if (unlikely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) == VM_LOCKED))
-		mlock_new_page(page);
+		mlock_new_page(&folio->page);
 	else
-		lru_cache_add(page);
+		folio_add_lru(folio);
 }
 
 /*