linux-kernel - Re: [PATCH v2 01/10] mm/memory_hotplug: inline __offline_pages() into offline

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Date:   Mon, 31 Aug 2020 12:05:29 +0200
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>, Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 01/10] mm/memory_hotplug: inline __offline_pages() into offline_pages()

> There is only a single user, offline_pages(). Let's inline, to make
> it look more similar to online_pages().
>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  mm/memory_hotplug.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 7f62d69660e06..c781d386d87f9 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1473,11 +1473,10 @@ static int count_system_ram_pages_cb(unsigned long start_pfn,
>         return 0;
>  }
>
> -static int __ref __offline_pages(unsigned long start_pfn,
> -                 unsigned long end_pfn)
> +int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>  {
> -       unsigned long pfn, nr_pages = 0;
> -       unsigned long offlined_pages = 0;
> +       const unsigned long end_pfn = start_pfn + nr_pages;
> +       unsigned long pfn, system_ram_pages = 0, offlined_pages = 0;
>         int ret, node, nr_isolate_pageblock;
>         unsigned long flags;
>         struct zone *zone;
> @@ -1494,9 +1493,9 @@ static int __ref __offline_pages(unsigned long start_pfn,
>          * memory holes PG_reserved, don't need pfn_valid() checks, and can
>          * avoid using walk_system_ram_range() later.
>          */
> -       walk_system_ram_range(start_pfn, end_pfn - start_pfn, &nr_pages,
> +       walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages,
>                               count_system_ram_pages_cb);
> -       if (nr_pages != end_pfn - start_pfn) {
> +       if (system_ram_pages != nr_pages) {
>                 ret = -EINVAL;
>                 reason = "memory holes";
>                 goto failed_removal;
> @@ -1631,11 +1630,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
>         return ret;
>  }
>
> -int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
> -{
> -       return __offline_pages(start_pfn, start_pfn + nr_pages);
> -}
> -
>  static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
>  {
>         int ret = !is_memblock_offlined(mem);

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