Re: [PATCH 5/5] mm, memory_hotplug: be more verbose for memory offline failures

osalvador
2018-11-16T10:47:21Z

On Fri, 2018-11-16 at 09:30 +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index a919ba5cb3c8..ec2c7916dc2d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7845,6 +7845,7 @@ bool has_unmovable_pages(struct zone *zone,
> struct page *page, int count,
> return false;
> unmovable:
> WARN_ON_ONCE(zone_idx(zone) == ZONE_MOVABLE);
> + dump_page(pfn_to_page(pfn+iter), "unmovable page");

Would not be enough to just do:

dump_page(page, "unmovable page".

Unless I am missing something, page should already have the
right pfn?

<---
unsigned long check = pfn + iter;
page = pfn_to_page(check);
--->

The rest looks good to me

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