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Date:   Mon, 6 Jun 2022 11:01:29 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        regressions@lists.linux.dev, lkft-triage@lists.linaro.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        John Donnelly <john.p.donnelly@oracle.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        David Hildenbrand <david@redhat.com>,
        "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
        Zhen Lei <thunder.leizhen@huawei.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: Re: gcc-12: build errors: arch/arm64/kernel/setup.c:225:56: warning:
 array subscript -1 is outside array bounds of 'char[]' [-Warray-bounds]
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Hi,

On Fri, Jun 03, 2022 at 09:40:07AM +0200, Arnd Bergmann wrote:
> On Fri, Jun 3, 2022 at 4:03 AM Naresh Kamboju <naresh.kamboju@linaro.org>=
 wrote:
> >     inlined from 'setup_arch' at arch/arm64/kernel/setup.c:350:2:
> > arch/arm64/kernel/setup.c:225:56: warning: array subscript -1 is
> > outside array bounds of 'char[]' [-Warray-bounds]
> >   225 |         kernel_code.end     =3D __pa_symbol(__init_begin - 1);
> >
>=20
> Is this the only warning of this type that you get for arm64?

In that function, both kernel_code.end and kernel_data_end show a
similar warning in 5.19-rc1

> I think the easy fix would be to reword this line to
>=20
>        kernel_code.end     =3D __pa_symbol(__init_begin) - 1;

Doing this for both fix the warnings.

Maxime

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