linux-kernel - [PATCH v4 9/9] mm/ksm: replace set_page_stable_node by folio_set_stable

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Date: Tue,  9 Apr 2024 17:28:24 +0800
From: alexs@...nel.org
To: Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: "Alex Shi (tencent)" <alexs@...nel.org>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	Matthew Wilcox <willy@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Chris Wright <chrisw@...s-sol.org>,
	David Hildenbrand <david@...hat.com>
Subject: [PATCH v4 9/9] mm/ksm: replace set_page_stable_node by folio_set_stable_node

From: "Alex Shi (tencent)" <alexs@...nel.org>

Only single page could be reached where we set stable node after write
protect, so use folio converted func to replace page's. And remove the
unused func set_page_stable_node().

Signed-off-by: Alex Shi (tencent) <alexs@...nel.org>
Cc: Izik Eidus <izik.eidus@...ellosystems.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Chris Wright <chrisw@...s-sol.org>
Reviewed-by: David Hildenbrand <david@...hat.com>
---
 mm/ksm.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index a705ed16aa1b..0d703c3da9d8 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1094,17 +1094,11 @@ static inline struct ksm_stable_node *page_stable_node(struct page *page)
 	return folio_stable_node(page_folio(page));
 }
 
-static inline void set_page_stable_node(struct page *page,
-					struct ksm_stable_node *stable_node)
-{
-	VM_BUG_ON_PAGE(PageAnon(page) && PageAnonExclusive(page), page);
-	page->mapping = (void *)((unsigned long)stable_node | PAGE_MAPPING_KSM);
-}
-
 static inline void folio_set_stable_node(struct folio *folio,
 					 struct ksm_stable_node *stable_node)
 {
-	set_page_stable_node(&folio->page, stable_node);
+	VM_WARN_ON_FOLIO(folio_test_anon(folio) && PageAnonExclusive(&folio->page), folio);
+	folio->mapping = (void *)((unsigned long)stable_node | PAGE_MAPPING_KSM);
 }
 
 #ifdef CONFIG_SYSFS
@@ -1519,7 +1513,7 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
 			 * PageAnon+anon_vma to PageKsm+NULL stable_node:
 			 * stable_tree_insert() will update stable_node.
 			 */
-			set_page_stable_node(page, NULL);
+			folio_set_stable_node(page_folio(page), NULL);
 			mark_page_accessed(page);
 			/*
 			 * Page reclaim just frees a clean page with no dirty
-- 
2.43.0