[RFC PATCH 13/25] mm/zsmalloc: convert reset_page() to reset_zsdesc()

[Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>]

reset_page() is called prior to freeing base pages of a zspage.
As it's closely associated with details of struct page, convert it to
reset_zsdesc() and move closer to newly added zsdesc helper functions.

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
---
 mm/zsmalloc.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index bbb65fb8749a..5a3948cbe06f 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -450,6 +450,17 @@ static inline void zsdesc_set_movable(struct zsdesc *zsdesc)
 	__SetPageMovable(page, &zsmalloc_mops);
 }
 
+static void reset_zsdesc(struct zsdesc *zsdesc)
+{
+	struct page *page = zsdesc_page(zsdesc);
+
+	__ClearPageMovable(page);
+	ClearPagePrivate(page);
+	set_page_private(page, 0);
+	page_mapcount_reset(page);
+	page->index = 0;
+}
+
 /* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
 static void SetZsHugePage(struct zspage *zspage)
 {
@@ -1080,15 +1091,6 @@ static bool obj_stores_deferred_handle(struct zsdesc *zsdesc, void *obj,
 }
 #endif
 
-static void reset_page(struct page *page)
-{
-	__ClearPageMovable(page);
-	ClearPagePrivate(page);
-	set_page_private(page, 0);
-	page_mapcount_reset(page);
-	page->index = 0;
-}
-
 static int trylock_zspage(struct zspage *zspage)
 {
 	struct zsdesc *cursor, *fail;
@@ -1164,7 +1166,7 @@ static void __free_zspage(struct zs_pool *pool, struct size_class *class,
 	do {
 		VM_BUG_ON_PAGE(!PageLocked(page), page);
 		next = get_next_page(page);
-		reset_page(page);
+		reset_zsdesc(page_zsdesc(page));
 		unlock_page(page);
 		dec_zone_page_state(page, NR_ZSPAGES);
 		put_page(page);
@@ -2269,7 +2271,7 @@ static int zs_page_migrate(struct page *newpage, struct page *page,
 		inc_zone_page_state(newpage, NR_ZSPAGES);
 	}
 
-	reset_page(page);
+	reset_zsdesc(page_zsdesc(page));
 	put_page(page);
 
 	return MIGRATEPAGE_SUCCESS;
-- 
2.25.1