linux-kernel - 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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Date:   Fri, 3 Jun 2022 09:40:07 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        regressions@...ts.linux.dev, lkft-triage@...ts.linaro.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Donnelly <john.p.donnelly@...cle.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Kefeng Wang <wangkefeng.wang@...wei.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]

On Fri, Jun 3, 2022 at 4:03 AM Naresh Kamboju <naresh.kamboju@...aro.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     = __pa_symbol(__init_begin - 1);
>

Is this the only warning of this type that you get for arm64?

I think the easy fix would be to reword this line to

       kernel_code.end     = __pa_symbol(__init_begin) - 1;


        Arnd