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SubjectRe: [PATCH v1] mm/memory_hotplug: Remove move_pfn_range()
On Wed, Jul 24, 2019 at 04:23:24PM +0200, David Hildenbrand wrote:
> Let's remove this indirection. We need the zone in the caller either
> way, so let's just detect it there. Add some documentation for
> move_pfn_range_to_zone() instead.
>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Oscar Salvador <osalvador@suse.de>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>

> ---
> mm/memory_hotplug.c | 23 +++++++----------------
> 1 file changed, 7 insertions(+), 16 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index efa5283be36c..e7c3b219a305 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -715,7 +715,11 @@ static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned lon
>
> pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn;
> }
> -
> +/*
> + * Associate the pfn range with the given zone, initializing the memmaps
> + * and resizing the pgdat/zone data to span the added pages. After this
> + * call, all affected pages are PG_reserved.
> + */
> void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
> unsigned long nr_pages, struct vmem_altmap *altmap)
> {
> @@ -804,20 +808,6 @@ struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
> return default_zone_for_pfn(nid, start_pfn, nr_pages);
> }
>
> -/*
> - * Associates the given pfn range with the given node and the zone appropriate
> - * for the given online type.
> - */
> -static struct zone * __meminit move_pfn_range(int online_type, int nid,
> - unsigned long start_pfn, unsigned long nr_pages)
> -{
> - struct zone *zone;
> -
> - zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages);
> - move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL);
> - return zone;
> -}
> -
> int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type)
> {
> unsigned long flags;
> @@ -840,7 +830,8 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
> put_device(&mem->dev);
>
> /* associate pfn range with the zone */
> - zone = move_pfn_range(online_type, nid, pfn, nr_pages);
> + zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages);
> + move_pfn_range_to_zone(zone, pfn, nr_pages, NULL);
>
> arg.start_pfn = pfn;
> arg.nr_pages = nr_pages;
> --
> 2.21.0
>

--
Oscar Salvador
SUSE L3

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