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

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Message-ID: <20221025155702.i55ndltxvu3pvnnp@revolver>
Date:   Tue, 25 Oct 2022 15:57:16 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "J. R. Okajima" <hooanon05g@...il.com>
CC:     "yang.lee@...ux.alibaba.com" <yang.lee@...ux.alibaba.com>,
        "yuzhao@...gle.com" <yuzhao@...gle.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "david@...hat.com" <david@...hat.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "dave@...olabs.net" <dave@...olabs.net>,
        "willy@...radead.org" <willy@...radead.org>,
        "sj@...nel.org" <sj@...nel.org>,
        "svens@...ux.ibm.com" <svens@...ux.ibm.com>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "will@...nel.org" <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: v6.1-rc1, remap_file_pages() and vma linked list?

* J. R. Okajima <hooanon05g@...il.com> [221025 03:09]:
> 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 broke this in the commit you reference below.

> 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.

Thanks for reporting this issue.  I have a fix that will be sent out
shortly.

Regards,
Liam