[PATCH 2/6] mm: memory_hotplug: use more folio in do_migrate_range()

[Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>]

With isolate_movable_folio() and folio_isolate_lru(), let's use
more folio in do_migrate_range() to save compound_head() calls.

Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
 mm/memory_hotplug.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a444e2d7dd2b..bd207772c619 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1774,14 +1774,14 @@ static int scan_movable_pages(unsigned long start, unsigned long end,
 
 static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 {
+	struct folio *folio;
 	unsigned long pfn;
-	struct page *page, *head;
 	LIST_HEAD(source);
 	static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
 				      DEFAULT_RATELIMIT_BURST);
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn++) {
-		struct folio *folio;
+		struct page *page, *head;
 		bool isolated;
 
 		if (!pfn_valid(pfn))
@@ -1818,15 +1818,15 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 		 * We can skip free pages. And we can deal with pages on
 		 * LRU and non-lru movable pages.
 		 */
-		if (PageLRU(page))
-			isolated = isolate_lru_page(page);
+		if (folio_test_lru(folio))
+			isolated = folio_isolate_lru(folio);
 		else
-			isolated = isolate_movable_page(page, ISOLATE_UNEVICTABLE);
+			isolated = isolate_movable_folio(folio, ISOLATE_UNEVICTABLE);
 		if (isolated) {
-			list_add_tail(&page->lru, &source);
-			if (!__PageMovable(page))
-				inc_node_page_state(page, NR_ISOLATED_ANON +
-						    page_is_file_lru(page));
+			list_add_tail(&folio->lru, &source);
+			if (!__folio_test_movable(folio))
+				node_stat_add_folio(folio, NR_ISOLATED_ANON +
+						    folio_is_file_lru(folio));
 
 		} else {
 			if (__ratelimit(&migrate_rs)) {
@@ -1834,7 +1834,7 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 				dump_page(page, "isolation failed");
 			}
 		}
-		put_page(page);
+		folio_put(folio);
 	}
 	if (!list_empty(&source)) {
 		nodemask_t nmask = node_states[N_MEMORY];
@@ -1846,9 +1846,9 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 
 		/*
 		 * We have checked that migration range is on a single zone so
-		 * we can use the nid of the first page to all the others.
+		 * we can use the nid of the first folio to all the others.
 		 */
-		mtc.nid = page_to_nid(list_first_entry(&source, struct page, lru));
+		mtc.nid = folio_nid(list_first_entry(&source, struct folio, lru));
 
 		/*
 		 * try to allocate from a different node but reuse this node
@@ -1861,11 +1861,11 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 		ret = migrate_pages(&source, alloc_migration_target, NULL,
 			(unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG, NULL);
 		if (ret) {
-			list_for_each_entry(page, &source, lru) {
+			list_for_each_entry(folio, &source, lru) {
 				if (__ratelimit(&migrate_rs)) {
 					pr_warn("migrating pfn %lx failed ret:%d\n",
-						page_to_pfn(page), ret);
-					dump_page(page, "migration failure");
+						folio_pfn(folio), ret);
+					dump_page(&folio->page, "migration failure");
 				}
 			}
 			putback_movable_pages(&source);
-- 
2.27.0