linux-kernel - Re: [PATCH v1] mm: migration: fix the FOLL

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Message-Id: <20220813162837.cc20e208e7a9d65fd2e7dc14@linux-foundation.org>
Date:   Sat, 13 Aug 2022 16:28:37 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Haiyue Wang <haiyue.wang@...el.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, david@...hat.com,
        linmiaohe@...wei.com, ying.huang@...el.com,
        songmuchun@...edance.com, naoya.horiguchi@...ux.dev
Subject: Re: [PATCH v1] mm: migration: fix the FOLL_GET failure on following
 huge page

On Fri, 12 Aug 2022 16:49:21 +0800 Haiyue Wang <haiyue.wang@...el.com> wrote:

> Not all huge page APIs support FOLL_GET option, so the __NR_move_pages
> will fail to get the page node information for huge page.

Which ones need fixing?

What are the user-visible runtime effects of this bug?

Is a -stable backport warranted?

> This is an temporary solution to mitigate the racing fix.
> 
> After supporting follow huge page by FOLL_GET is done, this fix can be
> reverted safely.
>