mm/rmap: convert page_move_anon_rmap() to folio_move_anon_rmap()

Let's convert it to consume a folio.

[akpm@linux-foundation.org: fix kerneldoc]
Link: https://lkml.kernel.org/r/20231002142949.235104-3-david@redhat.comSigned-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/rmap.h

@@ -189,7 +189,7 @@ typedef int __bitwise rmap_t;
 /*
  * rmap interfaces called when adding or removing pte of page
  */
-void page_move_anon_rmap(struct page *, struct vm_area_struct *);
+void folio_move_anon_rmap(struct folio *, struct vm_area_struct *);
 void page_add_anon_rmap(struct page *, struct vm_area_struct *,
 		unsigned long address, rmap_t flags);
 void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,

mm/huge_memory.c

@@ -1376,7 +1376,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf)
 	if (folio_ref_count(folio) == 1) {
 		pmd_t entry;
 
-		page_move_anon_rmap(page, vma);
+		folio_move_anon_rmap(folio, vma);
 		SetPageAnonExclusive(page);
 		folio_unlock(folio);
 reuse:

mm/hugetlb.c

@@ -5653,7 +5653,7 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
 	 */
 	if (folio_mapcount(old_folio) == 1 && folio_test_anon(old_folio)) {
 		if (!PageAnonExclusive(&old_folio->page)) {
-			page_move_anon_rmap(&old_folio->page, vma);
+			folio_move_anon_rmap(old_folio, vma);
 			SetPageAnonExclusive(&old_folio->page);
 		}
 		if (likely(!unshare))

mm/memory.c

@@ -3480,7 +3480,7 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf)
 		 * and the folio is locked, it's dark out, and we're wearing
 		 * sunglasses. Hit it.
 		 */
-		page_move_anon_rmap(vmf->page, vma);
+		folio_move_anon_rmap(folio, vma);
 		SetPageAnonExclusive(vmf->page);
 		folio_unlock(folio);
 reuse:

mm/rmap.c

@@ -1128,19 +1128,17 @@ int folio_total_mapcount(struct folio *folio)
 }
 
 /**
- * page_move_anon_rmap - move a page to our anon_vma
- * @page:	the page to move to our anon_vma
- * @vma:	the vma the page belongs to
+ * folio_move_anon_rmap - move a folio to our anon_vma
+ * @folio:	The folio to move to our anon_vma
+ * @vma:	The vma the folio belongs to
  *
- * When a page belongs exclusively to one process after a COW event,
- * that page can be moved into the anon_vma that belongs to just that
- * process, so the rmap code will not search the parent or sibling
- * processes.
+ * When a folio belongs exclusively to one process after a COW event,
+ * that folio can be moved into the anon_vma that belongs to just that
+ * process, so the rmap code will not search the parent or sibling processes.
  */
-void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
+void folio_move_anon_rmap(struct folio *folio, struct vm_area_struct *vma)
 {
 	void *anon_vma = vma->anon_vma;
-	struct folio *folio = page_folio(page);
 
 	VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
 	VM_BUG_ON_VMA(!anon_vma, vma);