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 <linmiaohe@xxxxxxxxxx>
---
include/linux/huge_mm.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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;
}
--
2.23.0
