linux-kernel - Re: [PATCH] mm/vmscan.c:Fix -Wunused-but-set-variable warning

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Message-ID: <CAHbLzkopfWZhT0f2D3VjUPyssDLO++zMqR+2qPbWNhkg0mUQ0A@mail.gmail.com>
Date:   Mon, 27 Sep 2021 09:51:03 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Kai Song <songkai01@...pur.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/vmscan.c:Fix -Wunused-but-set-variable warning

On Sun, Sep 26, 2021 at 1:36 AM Kai Song <songkai01@...pur.com> wrote:
>
> We fix the following warning when building kernel with W=1:
> mm/vmscan.c:1362:6: warning: variable 'err' set but not used [-Wunused-but-set-variable]
>
> Signed-off-by: Kai Song <songkai01@...pur.com>

Reviewed-by: Yang Shi <shy828301@...il.com>

> ---
>  mm/vmscan.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index f8b43f131673..7cf702bc1959 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1359,7 +1359,6 @@ static unsigned int demote_page_list(struct list_head *demote_pages,
>  {
>         int target_nid = next_demotion_node(pgdat->node_id);
>         unsigned int nr_succeeded;
> -       int err;
>
>         if (list_empty(demote_pages))
>                 return 0;
> @@ -1368,7 +1367,7 @@ static unsigned int demote_page_list(struct list_head *demote_pages,
>                 return 0;
>
>         /* Demotion ignores all cpuset and mempolicy settings */
> -       err = migrate_pages(demote_pages, alloc_demote_page, NULL,
> +       migrate_pages(demote_pages, alloc_demote_page, NULL,
>                             target_nid, MIGRATE_ASYNC, MR_DEMOTION,
>                             &nr_succeeded);
>
> --
> 2.27.0
>
>