[PATCH] mm/gup: Add folio to list when folio_isolate_lru() succeed

[Baolin Wang]

On 1/31/2023 2:32 PM, Kuan-Ying Lee wrote:
> If we call folio_isolate_lru() successfully, we will get
> return value 0. We need to add this folio to the
> movable_pages_list.
> 
> Fixes: 67e139b02d99 ("mm/gup.c: refactor check_and_migrate_movable_pages()")
> Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee at mediatek.com>

Good catch.
Reviewed-by: Baolin Wang <baolin.wang at linux.alibaba.com>

> ---
>   mm/gup.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index f3d2cccb89f8..918c364d01ac 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -1914,7 +1914,7 @@ static unsigned long collect_longterm_unpinnable_pages(
>   			drain_allow = false;
>   		}
>   
> -		if (!folio_isolate_lru(folio))
> +		if (folio_isolate_lru(folio))
>   			continue;
>   
>   		list_add_tail(&folio->lru, movable_page_list);