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Date:   Wed, 9 Feb 2022 20:49:57 -0800 (PST)
From:   Hugh Dickins <hughd@google.com>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
cc:     open list <linux-kernel@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        regressions@lists.linux.dev, lkft-triage@lists.linaro.org,
        Hugh Dickins <hughd@google.com>,
        Alistair Popple <apopple@nvidia.com>,
        David Hildenbrand <david@redhat.com>,
        Greg Thelen <gthelen@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Michal Hocko <mhocko@suse.com>,
        Rik van Riel <riel@surriel.com>,
        Shakeel Butt <shakeelb@google.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Vlastimil Babka <vbabka@suse.cz>, Yu Zhao <yuzhao@google.com>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: mm/munlock: mlock_page() munlock_page() batch by pagevec
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On Wed, 9 Feb 2022, Naresh Kamboju wrote:
> The following build regression noticed while building Linux next 20220209
> arm/riscv/sh of allnoconfig and tinyconfig builds failed with gcc-10,
> gcc-11 and clang-13.
> 
> clang: warning: argument unused during compilation: '-march=armv7-m'
> [-Wunused-command-line-argument]
> mm/swap.c:637:2: error: implicit declaration of function
> 'mlock_page_drain' [-Werror,-Wimplicit-function-declaration]
>         mlock_page_drain(cpu);
>         ^
> 1 error generated.
> make[2]: *** [scripts/Makefile.build:289: mm/swap.o] Error 1
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

Thanks Naresh, Geert had already reported, and SeongJae sent a fix in

https://lore.kernel.org/lkml/20220209094158.21941-2-sj@kernel.org/

Turns out that a !CONFIG_MMU CONFIG_SMP config will need one more stub,
I just sent a v2 update to SJ's patch in that thread.

Hugh