linux-kernel - Re: [PATCH v3] mm/page_owner: fix for deferred struct page init

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Date:   Thu, 20 Dec 2018 14:00:10 -0700
From:   William Kucharski <william.kucharski@...cle.com>
To:     Qian Cai <cai@....pw>
Cc:     akpm@...ux-foundation.org, mhocko@...e.com,
        Pavel.Tatashin@...rosoft.com, mingo@...nel.org, hpa@...or.com,
        mgorman@...hsingularity.net, iamjoonsoo.kim@....com,
        yang.shi@...aro.org, tglx@...utronix.de, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm/page_owner: fix for deferred struct page init



> On Dec 20, 2018, at 1:31 PM, Qian Cai <cai@....pw> wrote:
> 
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index ae44f7adbe07..d76fd51e312a 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -399,9 +399,8 @@ void __init page_ext_init(void)
> 			 * -------------pfn-------------->
> 			 * N0 | N1 | N2 | N0 | N1 | N2|....
> 			 *
> -			 * Take into account DEFERRED_STRUCT_PAGE_INIT.
> 			 */
> -			if (early_pfn_to_nid(pfn) != nid)
> +			if (pfn_to_nid(pfn) != nid)
> 				continue;
> 			if (init_section_page_ext(pfn, nid))
> 				goto oom;
> -- 
> 2.17.2 (Apple Git-113)
> 

Is there any danger in the fact that in the CONFIG_NUMA case in mmzone.h (around line 1261), pfn_to_nid() calls page_to_nid(), possibly causing the same issue seen in v2?