linux-kernel - Re: [PATCH 2/3] mm/memory_hotplug: fix potential permanent lru cache disable

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Date:   Mon, 23 Aug 2021 08:21:13 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mhocko@...e.com" <mhocko@...e.com>,
        "minchan@...nel.org" <minchan@...nel.org>,
        "cgoldswo@...eaurora.org" <cgoldswo@...eaurora.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mm/memory_hotplug: fix potential permanent lru cache
 disable

On Sat, Aug 21, 2021 at 05:42:45PM +0800, Miaohe Lin wrote:
> If offline_pages failed after lru_cache_disable(), it forgot to do
> lru_cache_enable() in error path. So we would have lru cache disabled
> permanently in this case.
> 
> Fixes: d479960e44f2 ("mm: disable LRU pagevec during the migration temporarily")
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Naoya Horiguchi <naoya.horiguchi@....com>