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Message-ID: <ZMPLFqJ192j0loCV@casper.infradead.org>
Date: Fri, 28 Jul 2023 15:05:10 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Yongqin Liu <yongqin.liu@...aro.org>
Cc: Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
Mike Rapoport <rppt@...nel.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
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Suren Baghdasaryan <surenb@...gle.com>,
Qi Zheng <zhengqi.arch@...edance.com>,
Yang Shi <shy828301@...il.com>,
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Peter Xu <peterx@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
Alistair Popple <apopple@...dia.com>,
Ralph Campbell <rcampbell@...dia.com>,
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Steven Price <steven.price@....com>,
SeongJae Park <sj@...nel.org>,
Lorenzo Stoakes <lstoakes@...il.com>,
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Pasha Tatashin <pasha.tatashin@...een.com>,
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Minchan Kim <minchan@...nel.org>,
Christoph Hellwig <hch@...radead.org>,
Song Liu <song@...nel.org>,
Thomas Hellstrom <thomas.hellstrom@...ux.intel.com>,
Ryan Roberts <ryan.roberts@....com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 04/32] mm/pgtable: allow pte_offset_map[_lock]() to
fail
On Fri, Jul 28, 2023 at 09:53:29PM +0800, Yongqin Liu wrote:
> Hi, Hugh
>
> It seems this change makes pte_offset_map_lock not possible to be
> called in out of tree modules,
> otherwise it will report error like this:
> ERROR: modpost: "__pte_offset_map_lock"
> [../omap-modules/android-mainline/pvr/pvrsrvkm.ko] undefined!
>
> Not sure if you have any idea about it, and any suggestions on how to
> resolve it?
Please explain why this module needs to map page tables
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