linux-kernel - Re: [PATCH v4 1/5] mm/sparse.c: introduce new function fill_subsection

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Date:   Thu, 12 Mar 2020 14:30:41 +0100
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>, mhocko@...e.com,
        David Hildenbrand <david@...hat.com>,
        richard.weiyang@...il.com, dan.j.williams@...el.com
Subject: Re: [PATCH v4 1/5] mm/sparse.c: introduce new function fill_subsection_map()

>
> Factor out the code that fills the subsection map from section_activate()
> into fill_subsection_map(), this makes section_activate() cleaner and
> easier to follow.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Reviewed-by: Wei Yang <richard.weiyang@...il.com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> ---
>  mm/sparse.c | 32 +++++++++++++++++++++-----------
>  1 file changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index cf28505e82c5..5919bc5b1547 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -792,24 +792,15 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
>                 ms->section_mem_map = (unsigned long)NULL;
>  }
>
> -static struct page * __meminit section_activate(int nid, unsigned long pfn,
> -               unsigned long nr_pages, struct vmem_altmap *altmap)
> +static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
>  {
> -       DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
>         struct mem_section *ms = __pfn_to_section(pfn);
> -       struct mem_section_usage *usage = NULL;
> +       DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
>         unsigned long *subsection_map;
> -       struct page *memmap;
>         int rc = 0;
>
>         subsection_mask_set(map, pfn, nr_pages);
>
> -       if (!ms->usage) {
> -               usage = kzalloc(mem_section_usage_size(), GFP_KERNEL);
> -               if (!usage)
> -                       return ERR_PTR(-ENOMEM);
> -               ms->usage = usage;
> -       }
>         subsection_map = &ms->usage->subsection_map[0];
>
>         if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
> @@ -820,6 +811,25 @@ static struct page * __meminit section_activate(int nid, unsigned long pfn,
>                 bitmap_or(subsection_map, map, subsection_map,
>                                 SUBSECTIONS_PER_SECTION);
>
> +       return rc;
> +}
> +
> +static struct page * __meminit section_activate(int nid, unsigned long pfn,
> +               unsigned long nr_pages, struct vmem_altmap *altmap)
> +{
> +       struct mem_section *ms = __pfn_to_section(pfn);
> +       struct mem_section_usage *usage = NULL;
> +       struct page *memmap;
> +       int rc = 0;
> +
> +       if (!ms->usage) {
> +               usage = kzalloc(mem_section_usage_size(), GFP_KERNEL);
> +               if (!usage)
> +                       return ERR_PTR(-ENOMEM);
> +               ms->usage = usage;
> +       }
> +
> +       rc = fill_subsection_map(pfn, nr_pages);
>         if (rc) {
>                 if (usage)
>                         ms->usage = NULL;
> --

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

> 2.17.2
>
>