[PATCH 06/28] mm: Convert page_add_anon_rmap() to use a folio internally

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

The API for page_add_anon_rmap() needs to be page-based, because we can
add mappings of individual pages.  But inside the function, we want to
only call compound_head() once and then use the folio APIs instead of
the page APIs that each call compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 mm/rmap.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index d137bd8e5309..187c7c832111 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1207,10 +1207,11 @@ static void __page_check_anon_rmap(struct page *page,
  * and to ensure that PageAnon is not being upgraded racily to PageKsm
  * (but PageKsm is never downgraded to PageAnon).
  */
-void page_add_anon_rmap(struct page *page,
-	struct vm_area_struct *vma, unsigned long address, rmap_t flags)
+void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
+		unsigned long address, rmap_t flags)
 {
-	atomic_t *mapped;
+	struct folio *folio = page_folio(page);
+	atomic_t *mapped = &folio->_nr_pages_mapped;
 	int nr = 0, nr_pmdmapped = 0;
 	bool compound = flags & RMAP_COMPOUND;
 	bool first = true;
@@ -1219,20 +1220,18 @@ void page_add_anon_rmap(struct page *page,
 	if (likely(!compound)) {
 		first = atomic_inc_and_test(&page->_mapcount);
 		nr = first;
-		if (first && PageCompound(page)) {
-			mapped = subpages_mapcount_ptr(compound_head(page));
+		if (first && folio_test_large(folio)) {
 			nr = atomic_inc_return_relaxed(mapped);
 			nr = (nr < COMPOUND_MAPPED);
 		}
-	} else if (PageTransHuge(page)) {
+	} else if (folio_test_pmd_mappable(folio)) {
 		/* That test is redundant: it's for safety or to optimize out */
 
-		first = atomic_inc_and_test(compound_mapcount_ptr(page));
+		first = atomic_inc_and_test(&folio->_entire_mapcount);
 		if (first) {
-			mapped = subpages_mapcount_ptr(page);
 			nr = atomic_add_return_relaxed(COMPOUND_MAPPED, mapped);
 			if (likely(nr < COMPOUND_MAPPED + COMPOUND_MAPPED)) {
-				nr_pmdmapped = thp_nr_pages(page);
+				nr_pmdmapped = folio_nr_pages(folio);
 				nr = nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED);
 				/* Raced ahead of a remove and another add? */
 				if (unlikely(nr < 0))
@@ -1248,11 +1247,11 @@ void page_add_anon_rmap(struct page *page,
 	VM_BUG_ON_PAGE(!first && PageAnonExclusive(page), page);
 
 	if (nr_pmdmapped)
-		__mod_lruvec_page_state(page, NR_ANON_THPS, nr_pmdmapped);
+		__lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr_pmdmapped);
 	if (nr)
-		__mod_lruvec_page_state(page, NR_ANON_MAPPED, nr);
+		__lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr);
 
-	if (likely(!PageKsm(page))) {
+	if (likely(!folio_test_ksm(folio))) {
 		/* address might be in next vma when migration races vma_adjust */
 		if (first)
 			__page_set_anon_rmap(page, vma, address,
-- 
2.35.1