linux-kernel - Re: [PATCH 12/16] arm64: prefer __section from compiler

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Message-ID: <20190813082744.xmzmm4j675rqiz47@willie-the-truck>
Date:   Tue, 13 Aug 2019 09:27:44 +0100
From:   Will Deacon <will@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     akpm@...ux-foundation.org, sedat.dilek@...il.com,
        jpoimboe@...hat.com, yhs@...com, miguel.ojeda.sandonis@...il.com,
        clang-built-linux@...glegroups.com,
        Catalin Marinas <catalin.marinas@....com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 12/16] arm64: prefer __section from compiler_attributes.h

Hi Nick,

On Mon, Aug 12, 2019 at 02:50:45PM -0700, Nick Desaulniers wrote:
> GCC unescapes escaped string section names while Clang does not. Because
> __section uses the `#` stringification operator for the section name, it
> doesn't need to be escaped.
> 
> This antipattern was found with:
> $ grep -e __section\(\" -e __section__\(\" -r
> 
> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
> Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/arm64/include/asm/cache.h     | 2 +-
>  arch/arm64/kernel/smp_spin_table.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Does this fix a build issue, or is it just cosmetic or do we end up with
duplicate sections or something else?

Happy to route it via arm64, just having trouble working out whether it's
5.3 material!

Will