[v2,13/16] mm/huge_memory: fix comment of page_deferred_list

Commit Message

Miaohe Lin June 28, 2022, 1:28 p.m. UTC

The current comment is confusing because if global or memcg deferred list
in the second tail page is occupied by compound_head, why we still use
page[2].deferred_list here? I think it wants to say that Global or memcg
deferred list in the first tail page is occupied by compound_mapcount and
compound_pincount so we use the second tail page's deferred_list instead.

Signed-off-by: Miaohe Lin <[e-mail]>
---
 include/linux/huge_mm.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 12b297f9951d..37f2f11a6d7e 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -294,8 +294,8 @@  static inline bool thp_migration_supported(void)
 static inline struct list_head *page_deferred_list(struct page *page)
 {
 	/*
-	 * Global or memcg deferred list in the second tail pages is
-	 * occupied by compound_head.
+	 * See organization of tail pages of compound page in
+	 * "struct page" definition.
 	 */
 	return &page[2].deferred_list;
 }