linux-kernel - Re: [PATCH 3/6] mm, memory_hotplug: drop arch_free

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Message-ID: <51a7daf7815d000ac0fdb57755a054b2@suse.de>
Date:   Fri, 28 Jan 2022 07:29:05 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        Dennis Zhou <dennis@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Nico Pache <npache@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Rafael Aquini <raquini@...hat.com>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 3/6] mm, memory_hotplug: drop arch_free_nodedata

On 2022-01-27 09:53, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.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@...hat.com>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

-- 
Oscar Salvador
SUSE Labs