linux-kernel - [RFC PATCH v2 13/21] mm/zsmalloc: convert reset_page() to reset

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Date:   Thu, 13 Jul 2023 13:20:28 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Minchan Kim <minchan@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>
Subject: [RFC PATCH v2 13/21] mm/zsmalloc: convert reset_page() to reset_zsdesc()

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

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

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 5141a0c72c61..085f5c791a03 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -388,6 +388,17 @@ static inline void free_zsdesc(struct zsdesc *zsdesc)
 	__free_page(page);
 }
 
+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)
 {
@@ -962,15 +973,6 @@ static inline bool obj_allocated(struct zsdesc *zsdesc, void *obj,
 	return true;
 }
 
-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;
@@ -1010,7 +1012,7 @@ 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);
@@ -2016,7 +2018,7 @@ 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;
-- 
2.41.0