Re: [PATCH 1/2] Check PageUnevictable in lru_deactivate_fn

[KOSAKI Motohiro]

> The lru_deactivate_fn should not move page which in on unevictable lru
> into inactive list. Otherwise, we can meet BUG when we use isolate_lru_pages
> as __isolate_lru_page could return -EINVAL.
> It's really BUG and let's fix it.
> 
> Reported-by: Ying Han <yinghan@xxxxxxxxxx>
> Tested-by: Ying Han <yinghan@xxxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
> ---
>  mm/swap.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/swap.c b/mm/swap.c
> index a83ec5a..2e9656d 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -429,6 +429,9 @@ static void lru_deactivate_fn(struct page *page, void *arg)
>  	if (!PageLRU(page))
>  		return;
>  
> +	if (PageUnevictable(page))
> +		return;
> +

	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>



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