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SubjectRe: [PATCH v2 1/4] mm/memory-hotplug: fix lowmem count overflow when offline pages
> ---
> mm/page_alloc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 98cbdf6..23b921f 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6140,6 +6140,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
> list_del(&page->lru);
> rmv_page_order(page);
> zone->free_area[order].nr_free--;
> + if (PageHighMem(page))
> + totalhigh_pages -= 1 << order;
> for (i = 0; i < (1 << order); i++)
> SetPageReserved((page+i));
> pfn += (1 << order);

memory hotplug don't support 32bit since it was born, at least, when the system has highmem.
Why can't we disable memory hotremove when 32bit at compile time?




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