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Message-ID: <8462ca2b-822f-52c0-5986-93377d252fac@redhat.com>
Date: Mon, 9 Mar 2020 10:08:27 +0100
From: David Hildenbrand <david@...hat.com>
To: Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, mhocko@...e.com,
richardw.yang@...ux.intel.com, dan.j.williams@...el.com,
osalvador@...e.de, rppt@...ux.ibm.com
Subject: Re: [PATCH v3 6/7] mm/sparse.c: move subsection_map related codes
together
On 07.03.20 09:42, Baoquan He wrote:
> No functional change.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
> mm/sparse.c | 134 +++++++++++++++++++++++++---------------------------
> 1 file changed, 65 insertions(+), 69 deletions(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 0fbd79c4ad81..fde651ab8741 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -244,10 +244,75 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
> nr_pages -= pfns;
> }
> }
> +
> +static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
> +{
> + DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
> + DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
> + struct mem_section *ms = __pfn_to_section(pfn);
> + unsigned long *subsection_map = ms->usage
> + ? &ms->usage->subsection_map[0] : NULL;
> +
> + subsection_mask_set(map, pfn, nr_pages);
> + if (subsection_map)
> + bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION);
> +
> + if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION),
> + "section already deactivated (%#lx + %ld)\n",
> + pfn, nr_pages))
> + return -EINVAL;
> +
> + bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
> +
> + return 0;
> +}
> +
> +static bool is_subsection_map_empty(struct mem_section *ms)
> +{
> + return bitmap_empty(&ms->usage->subsection_map[0],
> + SUBSECTIONS_PER_SECTION);
> +}
> +
> +static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
> +{
> + struct mem_section *ms = __pfn_to_section(pfn);
> + DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
> + unsigned long *subsection_map;
> + int rc = 0;
> +
> + subsection_mask_set(map, pfn, nr_pages);
> +
> + subsection_map = &ms->usage->subsection_map[0];
> +
> + if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
> + rc = -EINVAL;
> + else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION))
> + rc = -EEXIST;
> + else
> + bitmap_or(subsection_map, map, subsection_map,
> + SUBSECTIONS_PER_SECTION);
> +
> + return rc;
> +}
> #else
> void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
> {
> }
> +
> +static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
> +{
> + return 0;
> +}
> +
> +static bool is_subsection_map_empty(struct mem_section *ms)
> +{
> + return true;
> +}
> +
> +static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
> +{
> + return 0;
> +}
> #endif
>
> /* Record a memory area against a node. */
> @@ -732,46 +797,6 @@ static void free_map_bootmem(struct page *memmap)
> }
> #endif /* CONFIG_SPARSEMEM_VMEMMAP */
>
> -#ifdef CONFIG_SPARSEMEM_VMEMMAP
> -static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
> -{
> - DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
> - DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
> - struct mem_section *ms = __pfn_to_section(pfn);
> - unsigned long *subsection_map = ms->usage
> - ? &ms->usage->subsection_map[0] : NULL;
> -
> - subsection_mask_set(map, pfn, nr_pages);
> - if (subsection_map)
> - bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION);
> -
> - if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION),
> - "section already deactivated (%#lx + %ld)\n",
> - pfn, nr_pages))
> - return -EINVAL;
> -
> - bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
> -
> - return 0;
> -}
> -
> -static bool is_subsection_map_empty(struct mem_section *ms)
> -{
> - return bitmap_empty(&ms->usage->subsection_map[0],
> - SUBSECTIONS_PER_SECTION);
> -}
> -#else
> -static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
> -{
> - return 0;
> -}
> -
> -static bool is_subsection_map_empty(struct mem_section *ms)
> -{
> - return true;
> -}
> -#endif
> -
> /*
> * To deactivate a memory region, there are 3 cases to handle across
> * two configurations (SPARSEMEM_VMEMMAP={y,n}):
> @@ -826,35 +851,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
> ms->section_mem_map = (unsigned long)NULL;
> }
>
> -#ifdef CONFIG_SPARSEMEM_VMEMMAP
> -static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
> -{
> - struct mem_section *ms = __pfn_to_section(pfn);
> - DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
> - unsigned long *subsection_map;
> - int rc = 0;
> -
> - subsection_mask_set(map, pfn, nr_pages);
> -
> - subsection_map = &ms->usage->subsection_map[0];
> -
> - if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
> - rc = -EINVAL;
> - else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION))
> - rc = -EEXIST;
> - else
> - bitmap_or(subsection_map, map, subsection_map,
> - SUBSECTIONS_PER_SECTION);
> -
> - return rc;
> -}
> -#else
> -static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
> -{
> - return 0;
> -}
> -#endif
> -
> static struct page * __meminit section_activate(int nid, unsigned long pfn,
> unsigned long nr_pages, struct vmem_altmap *altmap)
> {
>
IMHO, we don't need this patch - but just my personal opinion. Change
itself looks good on a quick glance.
--
Thanks,
David / dhildenb
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