[PATCH v8 12/21] mm/zsmalloc: convert __free_zspage() to use zpdesc

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

From: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>

Introduce zpdesc_is_locked() and convert __free_zspage() to use zpdesc.

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Signed-off-by: Alex Shi <alexs@xxxxxxxxxx>
---
 mm/zpdesc.h   |  4 ++++
 mm/zsmalloc.c | 20 ++++++++++----------
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/mm/zpdesc.h b/mm/zpdesc.h
index 7d59bc2587bf..89fe78a7f5ca 100644
--- a/mm/zpdesc.h
+++ b/mm/zpdesc.h
@@ -127,4 +127,8 @@ static inline struct zone *zpdesc_zone(struct zpdesc *zpdesc)
 	return page_zone(zpdesc_page(zpdesc));
 }
 
+static inline bool zpdesc_is_locked(struct zpdesc *zpdesc)
+{
+	return folio_test_locked(zpdesc_folio(zpdesc));
+}
 #endif
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 87b2b100782f..2932351f4698 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -896,23 +896,23 @@ static int trylock_zspage(struct zspage *zspage)
 static void __free_zspage(struct zs_pool *pool, struct size_class *class,
 				struct zspage *zspage)
 {
-	struct page *page, *next;
+	struct zpdesc *zpdesc, *next;
 
 	assert_spin_locked(&class->lock);
 
 	VM_BUG_ON(get_zspage_inuse(zspage));
 	VM_BUG_ON(zspage->fullness != ZS_INUSE_RATIO_0);
 
-	next = page = get_first_page(zspage);
+	next = zpdesc = get_first_zpdesc(zspage);
 	do {
-		VM_BUG_ON_PAGE(!PageLocked(page), page);
-		next = get_next_page(page);
-		reset_zpdesc(page_zpdesc(page));
-		unlock_page(page);
-		dec_zone_page_state(page, NR_ZSPAGES);
-		put_page(page);
-		page = next;
-	} while (page != NULL);
+		VM_BUG_ON_PAGE(!zpdesc_is_locked(zpdesc), zpdesc_page(zpdesc));
+		next = get_next_zpdesc(zpdesc);
+		reset_zpdesc(zpdesc);
+		zpdesc_unlock(zpdesc);
+		zpdesc_dec_zone_page_state(zpdesc);
+		zpdesc_put(zpdesc);
+		zpdesc = next;
+	} while (zpdesc != NULL);
 
 	cache_free_zspage(pool, zspage);
 
-- 
2.45.2