linux-kernel - Re: [PATCH v6 09/14] mm/gup: migrate pinned pages out of movable zone

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Date:   Wed, 20 Jan 2021 16:31:42 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     kernel test robot <lkp@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>, kbuild-all@...ts.01.org
Subject: Re: [PATCH v6 09/14] mm/gup: migrate pinned pages out of movable zone

>    h8300-linux-ld: arch/h8300/kernel/entry.o: in function `resume_kernel':
>    (.text+0x29e): undefined reference to `TI_PRE_COUNT'
>    h8300-linux-ld: mm/gup.o: in function `.Llt6':
> >> gup.c:(.text+0x79e): undefined reference to `zero_pfn'

is_zero_pfn() is defined outside CONFIG_MMU, but uses zero_pfn, which
is declared in memory.c which is compiled with CONFIG_MMU.