linux-kernel - Re: [PATCH] mm: use is_zone_movable

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Date:   Wed, 27 Jul 2022 07:19:56 +0200
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: use is_zone_movable_page() helper

> Use is_zone_movable_page() helper to simplify code.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  drivers/virtio/virtio_mem.c | 6 ++----
>  mm/memory_hotplug.c         | 2 +-
>  2 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
> index e07486f01999..0c2892ec6817 100644
> --- a/drivers/virtio/virtio_mem.c
> +++ b/drivers/virtio/virtio_mem.c
> @@ -862,8 +862,7 @@ static void virtio_mem_sbm_notify_online(struct virtio_mem *vm,
>                                          unsigned long mb_id,
>                                          unsigned long start_pfn)
>  {
> -       const bool is_movable = page_zonenum(pfn_to_page(start_pfn)) ==
> -                               ZONE_MOVABLE;
> +       const bool is_movable = is_zone_movable_page(pfn_to_page(start_pfn));
>         int new_state;
>
>         switch (virtio_mem_sbm_get_mb_state(vm, mb_id)) {
> @@ -1158,8 +1157,7 @@ static void virtio_mem_fake_online(unsigned long pfn, unsigned long nr_pages)
>   */
>  static int virtio_mem_fake_offline(unsigned long pfn, unsigned long nr_pages)
>  {
> -       const bool is_movable = page_zonenum(pfn_to_page(pfn)) ==
> -                               ZONE_MOVABLE;
> +       const bool is_movable = is_zone_movable_page(pfn_to_page(pfn));
>         int rc, retry_count;
>
>         /*
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 1213d0c67a53..0f5914964a32 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -936,7 +936,7 @@ static struct zone *auto_movable_zone_for_pfn(int nid,
>                         if (!page)
>                                 continue;
>                         /* If anything is !MOVABLE online the rest !MOVABLE. */
> -                       if (page_zonenum(page) != ZONE_MOVABLE)
> +                       if (!is_zone_movable_page(page))
>                                 goto kernel_zone;
>                         online_pages += PAGES_PER_SECTION;
>                 }

Reviewed-by: Pankaj Gupta <pankaj.gupta@....com>