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Date:   Mon, 11 Oct 2021 13:53:45 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: Re: mm/kasan/init.c:282:20: error: redefinition of
 'kasan_populate_early_vm_area_shadow'
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On Mon, 11 Oct 2021 18:12:44 +0530 Naresh Kamboju <naresh.kamboju@linaro.org> wrote:

> + Andrew Morton <akpm@linux-foundation.org>
> 
> On Mon, 11 Oct 2021 at 17:08, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> >
> > Regression found on x86_64 gcc-11 built with KASAN enabled.
> > Following build warnings / errors reported on linux next 20211011.
> >
> > metadata:
> >     git_describe: next-20211011
> >     git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
> >     git_short_log: d3134eb5de85 (\"Add linux-next specific files for 20211011\")
> >     target_arch: x86_64
> >     toolchain: gcc-11
> >
> > build error :
> > --------------
> > mm/kasan/init.c:282:20: error: redefinition of
> > 'kasan_populate_early_vm_area_shadow'
> >   282 | void __init __weak kasan_populate_early_vm_area_shadow(void *start,
> >       |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > In file included from include/linux/mm.h:34,
> >                  from include/linux/memblock.h:13,
> >                  from mm/kasan/init.c:9:
> > include/linux/kasan.h:463:20: note: previous definition of
> > 'kasan_populate_early_vm_area_shadow' with type 'void(void *, long
> > unsigned int)'
> >   463 | static inline void kasan_populate_early_vm_area_shadow(void *start,
> >       |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > make[3]: *** [scripts/Makefile.build:288: mm/kasan/init.o] Error 1
> > make[3]: Target '__build' not remade because of errors.
> >
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> >
> > build link:
> > -----------
> > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/build.log
> >
> > build config:
> > -------------
> > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/config
> >
> > # To install tuxmake on your system globally
> > # sudo pip3 install -U tuxmake
> > tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-11
> > --kconfig defconfig --kconfig-add
> > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/config

Presumably "kasan: arm64: fix pcpu_page_first_chunk crash with
KASAN_VMALLOC".  Let's cc Kefeng.