Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210609072409.1357327-1-libaokun1@huawei.com>
In-Reply-To: <20210609072409.1357327-1-libaokun1@huawei.com>
From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 9 Jun 2021 21:17:23 +0300
Message-ID: <CAHp75VesvRMGY25WP-ZQaqWE-kyyp25GsvM8h=yMfO5U6r1gDA@mail.gmail.com>
Subject: Re: [PATCH -next v2] media: staging: atomisp: use list_move_tail
 instead of list_del/list_add_tail in atomisp_compat_css20.c
To:     Baokun Li <libaokun1@huawei.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Kaixu Xia <kaixuxia@tencent.com>,
        "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Wei Yongjun <weiyongjun1@huawei.com>,
        YueHaibing <yuehaibing@huawei.com>, yangjihong1@huawei.com,
        yukuai3@huawei.com,
        Linux Media Mailing List <linux-media@vger.kernel.org>,
        linux-staging@lists.linux.dev,
        kernel-janitors <kernel-janitors@vger.kernel.org>,
        Hulk Robot <hulkci@huawei.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Wed, Jun 9, 2021 at 4:32 PM Baokun Li <libaokun1@huawei.com> wrote:
>
> Using list_move_tail() instead of list_del() + list_add_tail() in atomisp_compat_css20.c.

Have you considered using list_splice() instead of entire while-loops?
Or something similar from list.h...

>         while (!list_empty(&asd->s3a_stats_in_css)) {
>                 s3a_buf = list_entry(asd->s3a_stats_in_css.next,
>                                      struct atomisp_s3a_buf, list);
> -               list_del(&s3a_buf->list);
> -               list_add_tail(&s3a_buf->list, &asd->s3a_stats);
> +               list_move_tail(&s3a_buf->list, &asd->s3a_stats);
>         }
>         while (!list_empty(&asd->s3a_stats_ready)) {
>                 s3a_buf = list_entry(asd->s3a_stats_ready.next,
>                                      struct atomisp_s3a_buf, list);
> -               list_del(&s3a_buf->list);
> -               list_add_tail(&s3a_buf->list, &asd->s3a_stats);
> +               list_move_tail(&s3a_buf->list, &asd->s3a_stats);
>         }

>         while (!list_empty(&asd->dis_stats_in_css)) {
>                 dis_buf = list_entry(asd->dis_stats_in_css.next,
>                                      struct atomisp_dis_buf, list);
> -               list_del(&dis_buf->list);
> -               list_add_tail(&dis_buf->list, &asd->dis_stats);
> +               list_move_tail(&dis_buf->list, &asd->dis_stats);
>         }

>                 while (!list_empty(&asd->metadata_in_css[i])) {
>                         md_buf = list_entry(asd->metadata_in_css[i].next,
>                                             struct atomisp_metadata_buf, list);
> -                       list_del(&md_buf->list);
> -                       list_add_tail(&md_buf->list, &asd->metadata[i]);
> +                       list_move_tail(&md_buf->list, &asd->metadata[i]);
>                 }
>                 while (!list_empty(&asd->metadata_ready[i])) {
>                         md_buf = list_entry(asd->metadata_ready[i].next,
>                                             struct atomisp_metadata_buf, list);
> -                       list_del(&md_buf->list);
> -                       list_add_tail(&md_buf->list, &asd->metadata[i]);
> +                       list_move_tail(&md_buf->list, &asd->metadata[i]);
>                 }

-- 
With Best Regards,
Andy Shevchenko