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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]
Date: Mon, 6 Jun 2022 11:01:29 +0200	[thread overview]
Message-ID: <20220606090129.mpidmwwobgkcfc2v@houat> (raw)
In-Reply-To: <CAK8P3a3QKWxqGore3+_DJnWo7bJgvDhkZjtkyg5EUg4_D=mE2w@mail.gmail.com>

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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     = __pa_symbol(__init_begin - 1);
> >
> 
> 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
> 
>        kernel_code.end     = __pa_symbol(__init_begin) - 1;

Doing this for both fix the warnings.

Maxime

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WARNING: multiple messages have this Message-ID (diff)
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]
Date: Mon, 6 Jun 2022 11:01:29 +0200	[thread overview]
Message-ID: <20220606090129.mpidmwwobgkcfc2v@houat> (raw)
In-Reply-To: <CAK8P3a3QKWxqGore3+_DJnWo7bJgvDhkZjtkyg5EUg4_D=mE2w@mail.gmail.com>


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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     = __pa_symbol(__init_begin - 1);
> >
> 
> 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
> 
>        kernel_code.end     = __pa_symbol(__init_begin) - 1;

Doing this for both fix the warnings.

Maxime

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  reply	other threads:[~2022-06-06  9:01 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-03  2:03 gcc-12: build errors: arch/arm64/kernel/setup.c:225:56: warning: array subscript -1 is outside array bounds of 'char[]' [-Warray-bounds] Naresh Kamboju
2022-06-03  2:03 ` Naresh Kamboju
2022-06-03  7:40 ` Arnd Bergmann
2022-06-03  7:40   ` Arnd Bergmann
2022-06-06  9:01   ` Maxime Ripard [this message]
2022-06-06  9:01     ` Maxime Ripard
2022-06-06  9:41   ` Mark Rutland
2022-06-06  9:41     ` Mark Rutland
2022-06-08  6:54     ` Arnd Bergmann
2022-06-08  6:54       ` Arnd Bergmann

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