[PATCH] fs/dax: Remove redundant deferred list initialization

[Kaitao Cheng <kaitao.cheng@linux.dev>]

From: Kaitao Cheng <chengkaitao@kylinos.cn>

prep_compound_page() calls prep_compound_head(), which initializes
folio->_deferred_list for compound folios with an order greater than one.
Therefore, dax_folio_init() initializes the list twice for large DAX
folios.

Remove the redundant initialization from dax_folio_init(). This leaves
the behavior unchanged and keeps compound folio initialization
centralized in prep_compound_head().

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
---
 fs/dax.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 6ba50142eeb2..dad4efea7964 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -469,8 +469,6 @@ static void dax_folio_init(void *entry)
 
 	if (order > 0) {
 		prep_compound_page(&folio->page, order);
-		if (order > 1)
-			INIT_LIST_HEAD(&folio->_deferred_list);
 		WARN_ON_ONCE(folio_ref_count(folio));
 	}
 }
-- 
2.50.1 (Apple Git-155)