linux-kernel - Re: [PATCH 7/9] mm/z3fold: remove redundant list_del_init of zhdr->buddy in z3fold

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Message-ID: <CAM4kBBJ79OQDbetD20rLNRESE0ncYix5RMeuHvPSLHxyxxB3Dg@mail.gmail.com>
Date:   Wed, 2 Mar 2022 09:38:18 +0100
From:   Vitaly Wool <vitaly.wool@...sulko.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/9] mm/z3fold: remove redundant list_del_init of
 zhdr->buddy in z3fold_free

On Sat, Feb 19, 2022 at 10:26 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> The do_compact_page will do list_del_init(&zhdr->buddy) for us. Remove this
> extra one to save some possible cpu cycles.
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Vitaly Wool <vitaly.wool@...sulko.com>

> ---
>  mm/z3fold.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/mm/z3fold.c b/mm/z3fold.c
> index 18a697f6fe32..867c590df027 100644
> --- a/mm/z3fold.c
> +++ b/mm/z3fold.c
> @@ -1244,9 +1244,6 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
>                 return;
>         }
>         if (zhdr->cpu < 0 || !cpu_online(zhdr->cpu)) {
> -               spin_lock(&pool->lock);
> -               list_del_init(&zhdr->buddy);
> -               spin_unlock(&pool->lock);
>                 zhdr->cpu = -1;
>                 kref_get(&zhdr->refcount);
>                 clear_bit(PAGE_CLAIMED, &page->private);
> --
> 2.23.0
>