linux-kernel - v6.1-rc1, remap_file_pages() and vma linked list?

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Date:   Tue, 25 Oct 2022 16:09:19 +0900
From:   "J. R. Okajima" <hooanon05g@...il.com>
To:     Liam.Howlett@...cle.com, yang.lee@...ux.alibaba.com,
        yuzhao@...gle.com
Cc:     catalin.marinas@....com, david@...hat.com, dhowells@...hat.com,
        dave@...olabs.net, willy@...radead.org, sj@...nel.org,
        svens@...ux.ibm.com, vbabka@...e.cz, will@...nel.org,
        linux-kernel@...r.kernel.org
Subject: v6.1-rc1, remap_file_pages() and vma linked list?

Hello,

Linux-v4.10 has a commit
	48f7df329474 2016-02-18 mm: fix regression in remap_file_pages() emulation
and it contains a small test program where remap_file_pages() will split
a region into two VMAs.

Linux-v6.1-rc1 remap_file_pages() doesn't pass that old test.
I tried investigation, but I am not good in this tech field. I could
only find there may be related to the commit
	763ecb035029 2022-09-26 mm: remove the vma linked list
but I am not sure.
How can we make the old test pass?
"Don't use remap_file_pages()" or "Ignore such old test" is not an
option.


J. R. Okajima