[PATCH 2/4] mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()

[Kefeng Wang]

Rename numamigrate_isolate_page() to numamigrate_isolate_folio(), then
make it takes a folio and use folio API to save compound_head() calls.

Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
 mm/migrate.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index b0c318bc531c..39e0d35bccb3 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2476,15 +2476,15 @@ static struct folio *alloc_misplaced_dst_folio(struct folio *src,
 	return __folio_alloc_node(gfp, order, nid);
 }
 
-static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
+static int numamigrate_isolate_folio(pg_data_t *pgdat, struct folio *folio)
 {
-	int nr_pages = thp_nr_pages(page);
-	int order = compound_order(page);
+	int nr_pages = folio_nr_pages(folio);
+	int order = folio_order(folio);
 
-	VM_BUG_ON_PAGE(order && !PageTransHuge(page), page);
+	VM_BUG_ON_FOLIO(order && !folio_test_pmd_mappable(folio), folio);
 
 	/* Do not migrate THP mapped by multiple processes */
-	if (PageTransHuge(page) && total_mapcount(page) > 1)
+	if (folio_test_pmd_mappable(folio) && folio_estimated_sharers(folio) > 1)
 		return 0;
 
 	/* Avoid migrating to a node that is nearly full */
@@ -2501,18 +2501,18 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
 		return 0;
 	}
 
-	if (!isolate_lru_page(page))
+	if (!folio_isolate_lru(folio))
 		return 0;
 
-	mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_is_file_lru(page),
+	node_stat_mod_folio(folio, NR_ISOLATED_ANON + folio_is_file_lru(folio),
 			    nr_pages);
 
 	/*
-	 * Isolating the page has taken another reference, so the
-	 * caller's reference can be safely dropped without the page
+	 * Isolating the folio has taken another reference, so the
+	 * caller's reference can be safely dropped without the folio
 	 * disappearing underneath us during migration.
 	 */
-	put_page(page);
+	folio_put(folio);
 	return 1;
 }
 
@@ -2546,7 +2546,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
 	if (page_is_file_lru(page) && PageDirty(page))
 		goto out;
 
-	isolated = numamigrate_isolate_page(pgdat, page);
+	isolated = numamigrate_isolate_folio(pgdat, page_folio(page));
 	if (!isolated)
 		goto out;
 
-- 
2.41.0