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Date:   Thu, 13 Apr 2017 14:59:00 +0200
From:   Vlastimil Babka <>
To:     Michal Hocko <>,
Cc:     Andrew Morton <>,
        Mel Gorman <>,
        Andrea Arcangeli <>,
        Jerome Glisse <>,
        Reza Arbab <>,
        Yasuaki Ishimatsu <>,, Kani Toshimitsu <>,, Joonsoo Kim <>,
        Andi Kleen <>,
        David Rientjes <>,
        Daniel Kiper <>,
        Igor Mammedov <>,
        Vitaly Kuznetsov <>,
        LKML <>,
        Michal Hocko <>
Subject: Re: [PATCH 3/9] mm: drop page_initialized check from get_nid_for_pfn

On 04/10/2017 01:03 PM, Michal Hocko wrote:
> From: Michal Hocko <>
> c04fc586c1a4 ("mm: show node to memory section relationship with
> symlinks in sysfs") has added means to export memblock<->node
> association into the sysfs. It has also introduced get_nid_for_pfn
> which is a rather confusing counterpart of pfn_to_nid which checks also
> whether the pfn page is already initialized (page_initialized).  This
> is done by checking page::lru != NULL which doesn't make any sense at
> all. Nothing in this path really relies on the lru list being used or
> initialized. Just remove it because this will become a problem with
> later patches.
> Thanks to Reza Arbab for testing which revealed this to be a problem
> (
> Signed-off-by: Michal Hocko <>

Acked-by: Vlastimil Babka <>

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