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Date:   Fri, 28 Jul 2023 15:05:10 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Yongqin Liu <yongqin.liu@linaro.org>
Cc:     Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        David Hildenbrand <david@redhat.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Qi Zheng <zhengqi.arch@bytedance.com>,
        Yang Shi <shy828301@gmail.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Peter Xu <peterx@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will@kernel.org>, Yu Zhao <yuzhao@google.com>,
        Alistair Popple <apopple@nvidia.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Steven Price <steven.price@arm.com>,
        SeongJae Park <sj@kernel.org>,
        Lorenzo Stoakes <lstoakes@gmail.com>,
        Huang Ying <ying.huang@intel.com>,
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        Christophe Leroy <christophe.leroy@csgroup.eu>,
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        Anshuman Khandual <anshuman.khandual@arm.com>,
        Pasha Tatashin <pasha.tatashin@soleen.com>,
        Miaohe Lin <linmiaohe@huawei.com>,
        Minchan Kim <minchan@kernel.org>,
        Christoph Hellwig <hch@infradead.org>,
        Song Liu <song@kernel.org>,
        Thomas Hellstrom <thomas.hellstrom@linux.intel.com>,
        Ryan Roberts <ryan.roberts@arm.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2 04/32] mm/pgtable: allow pte_offset_map[_lock]() to
 fail
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 <CAMSo37X5GzFmqNAtABuibmMAF7t=_5SYCipMPZ-TB+uEMYkSUA@mail.gmail.com>
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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