[PATCH v2 4/6] mm/migrate_device: convert __migrate_device_pages() to folios

[Sidhartha Kumar <sidhartha.kumar@oracle.com>]

Use migrate_pfn_to_folio() so we can work with folios directly in
__migrate_device_pages().

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
---
 mm/migrate_device.c | 36 +++++++++++++++---------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 81623f2d72c2b..d9633c7b1d21b 100644
--- a/mm/migrate_device.c
+++ b/mm/migrate_device.c
@@ -687,17 +687,17 @@ static void __migrate_device_pages(unsigned long *src_pfns,
 	bool notified = false;
 
 	for (i = 0; i < npages; i++) {
-		struct page *newpage = migrate_pfn_to_page(dst_pfns[i]);
-		struct page *page = migrate_pfn_to_page(src_pfns[i]);
+		struct folio *dst = migrate_pfn_to_folio(dst_pfns[i]);
+		struct folio *src = migrate_pfn_to_folio(src_pfns[i]);
 		struct address_space *mapping;
 		int r;
 
-		if (!newpage) {
+		if (!dst) {
 			src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
 			continue;
 		}
 
-		if (!page) {
+		if (!src) {
 			unsigned long addr;
 
 			if (!(src_pfns[i] & MIGRATE_PFN_MIGRATE))
@@ -719,33 +719,29 @@ static void __migrate_device_pages(unsigned long *src_pfns,
 					migrate->pgmap_owner);
 				mmu_notifier_invalidate_range_start(&range);
 			}
-			migrate_vma_insert_page(migrate, addr, newpage,
+			migrate_vma_insert_page(migrate, addr, &dst->page,
 						&src_pfns[i]);
 			continue;
 		}
 
-		mapping = page_mapping(page);
+		mapping = folio_mapping(src);
 
-		if (is_device_private_page(newpage) ||
-		    is_device_coherent_page(newpage)) {
+		if (folio_is_device_private(dst) ||
+		    folio_is_device_coherent(dst)) {
 			if (mapping) {
-				struct folio *folio;
-
-				folio = page_folio(page);
-
 				/*
 				 * For now only support anonymous memory migrating to
 				 * device private or coherent memory.
 				 *
 				 * Try to get rid of swap cache if possible.
 				 */
-				if (!folio_test_anon(folio) ||
-				    !folio_free_swap(folio)) {
+				if (!folio_test_anon(src) ||
+				    !folio_free_swap(src)) {
 					src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
 					continue;
 				}
 			}
-		} else if (is_zone_device_page(newpage)) {
+		} else if (folio_is_zone_device(dst)) {
 			/*
 			 * Other types of ZONE_DEVICE page are not supported.
 			 */
@@ -753,13 +749,11 @@ static void __migrate_device_pages(unsigned long *src_pfns,
 			continue;
 		}
 
-		if (migrate && migrate->fault_page == page)
-			r = migrate_folio_extra(mapping, page_folio(newpage),
-						page_folio(page),
-						MIGRATE_SYNC_NO_COPY, 1);
+		if (migrate && migrate->fault_page == &src->page)
+			r = migrate_folio_extra(mapping, dst, src,
+								MIGRATE_SYNC_NO_COPY, 1);
 		else
-			r = migrate_folio(mapping, page_folio(newpage),
-					page_folio(page), MIGRATE_SYNC_NO_COPY);
+			r = migrate_folio(mapping, dst, src, MIGRATE_SYNC_NO_COPY);
 		if (r != MIGRATEPAGE_SUCCESS)
 			src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
 	}
-- 
2.42.0