linux-kernel - Re: [PATCH] mm: use early_pfn_to_nid in register_page_bootmem_info

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Message-Id: <20160525152319.fa87b4cc0b8326fef89a1b92@linux-foundation.org>
Date:	Wed, 25 May 2016 15:23:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] mm: use early_pfn_to_nid in
 register_page_bootmem_info_node

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