page_ext_operations should only be defined when CONFIG_PAGE_EXTENSION is
enabled.
Besides, this may detect missing rely on CONFIG_PAGE_EXTENSION from
future Page Extension client at compile time.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 include/linux/page_ext.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h
index 67314f648aeb..8dd21d87e0da 100644
--- a/include/linux/page_ext.h
+++ b/include/linux/page_ext.h
@@ -8,6 +8,7 @@
 
 struct pglist_data;
 
+#ifdef CONFIG_PAGE_EXTENSION
 /**
  * struct page_ext_operations - per page_ext client operations
  * @offset: Offset to the client's data within page_ext. Offset is returned to
@@ -29,8 +30,6 @@ struct page_ext_operations {
 	bool need_shared_flags;
 };
 
-#ifdef CONFIG_PAGE_EXTENSION
-
 /*
  * The page_ext_flags users must set need_shared_flags to true.
  */
-- 
2.30.0