Re: [PATCH] mm: use early_pfn_to_nid in register_page_bootmem_info_node

[Andrew Morton]

On Wed, 25 May 2016 14:00:07 -0700 Yang Shi <yang.shi@xxxxxxxxxx> wrote:

> register_page_bootmem_info_node() is invoked in mem_init(), so it will be
> called before page_alloc_init_late() if CONFIG_DEFERRED_STRUCT_PAGE_INIT
> is enabled. But, pfn_to_nid() depends on memmap which won't be fully setup
> until page_alloc_init_late() is done, so replace pfn_to_nid() by
> early_pfn_to_nid().

What are the runtime effects of this fix?