From: Zeng Jingxiang <linuszeng@tencent.com>

z3fold_page_lock() will lock zhdr->page_lock
1630	z3fold_page_lock(zhdr);

return without unlocking zhdr->page_lock
1634	if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
1635		return;

Signed-off-by: Zeng Jingxiang <linuszeng@tencent.com>
---
 mm/z3fold.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index f41f8b0d9e9a..03785832ad47 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -1632,13 +1632,14 @@ static void z3fold_page_putback(struct page *page)
 		list_del_init(&zhdr->buddy);
 	INIT_LIST_HEAD(&page->lru);
 	if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
-		return;
+		goto ret;
 	spin_lock(&pool->lock);
 	list_add(&page->lru, &pool->lru);
 	spin_unlock(&pool->lock);
 	if (list_empty(&zhdr->buddy))
 		add_to_unbuddied(pool, zhdr);
 	clear_bit(PAGE_CLAIMED, &page->private);
+ret:
 	z3fold_page_unlock(zhdr);
 }
 
-- 
2.27.0

<zengjx95@gmail.com> 于2022年7月20日周三 14:58写道：
>
> From: Zeng Jingxiang <linuszeng@tencent.com>
>
> z3fold_page_lock() will lock zhdr->page_lock
> 1630    z3fold_page_lock(zhdr);
>
> return without unlocking zhdr->page_lock
> 1634    if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
> 1635            return;
>
> Signed-off-by: Zeng Jingxiang <linuszeng@tencent.com>
> ---
>  mm/z3fold.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/z3fold.c b/mm/z3fold.c
> index f41f8b0d9e9a..03785832ad47 100644
> --- a/mm/z3fold.c
> +++ b/mm/z3fold.c
> @@ -1632,13 +1632,14 @@ static void z3fold_page_putback(struct page *page)
>                 list_del_init(&zhdr->buddy);
>         INIT_LIST_HEAD(&page->lru);
>         if (kref_put(&zhdr->refcount, release_z3fold_page_locked))
> -               return;
> +               goto ret;
>         spin_lock(&pool->lock);
>         list_add(&page->lru, &pool->lru);
>         spin_unlock(&pool->lock);
>         if (list_empty(&zhdr->buddy))
>                 add_to_unbuddied(pool, zhdr);
>         clear_bit(PAGE_CLAIMED, &page->private);
> +ret:
>         z3fold_page_unlock(zhdr);
>  }
>
> --
> 2.27.0
>
Sorry, I just misunderstood the code logic, please ignore this patch.