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Date:   Tue, 1 Feb 2022 02:41:52 +0000
From:   Wei Yang <richard.weiyang@gmail.com>
To:     Michal Hocko <mhocko@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        LKML <linux-kernel@vger.kernel.org>,
        David Hildenbrand <david@redhat.com>,
        Alexey Makhalov <amakhalov@vmware.com>,
        Dennis Zhou <dennis@kernel.org>,
        Eric Dumazet <eric.dumazet@gmail.com>,
        Oscar Salvador <osalvador@suse.de>, Tejun Heo <tj@kernel.org>,
        Christoph Lameter <cl@linux.com>,
        Nico Pache <npache@redhat.com>,
        Wei Yang <richard.weiyang@gmail.com>,
        Rafael Aquini <raquini@redhat.com>,
        Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH 3/6] mm, memory_hotplug: drop arch_free_nodedata
Message-ID: <20220201024152.uqksmmethxs4q2pe@master>
Reply-To: Wei Yang <richard.weiyang@gmail.com>
References: <20220127085305.20890-1-mhocko@kernel.org>
 <20220127085305.20890-4-mhocko@kernel.org>
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On Thu, Jan 27, 2022 at 09:53:02AM +0100, Michal Hocko wrote:
>From: Michal Hocko <mhocko@suse.com>
>
>Prior to "mm: handle uninitialized numa nodes gracefully" memory hotplug
>used to allocate pgdat when memory has been added to a node
>(hotadd_init_pgdat) arch_free_nodedata has been only used in the
>failure path because once the pgdat is exported (to be visible
>by NODA_DATA(nid)) it cannot really be freed because there is no
>synchronization available for that.
>
>pgdat is allocated for each possible nodes now so the memory hotplug
>doesn't need to do the ever use arch_free_nodedata so drop it.
>
>This patch doesn't introduce any functional change.
>
>Acked-by: Rafael Aquini <raquini@redhat.com>
>Signed-off-by: Michal Hocko <mhocko@suse.com>

Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
-- 
Wei Yang
Help you, Help me