Re: [PATCH 12/16] arm64: prefer __section from compiler_attributes.h

From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Will Deacon <will@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Sedat Dilek <sedat.dilek@gmail.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	yhs@fb.com, clang-built-linux@googlegroups.com,
	Catalin Marinas <catalin.marinas@arm.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Enrico Weigelt <info@metux.net>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>,
	Shaokun Zhang <zhangshaokun@hisilicon.com>,
	Alexios Zavras <alexios.zavras@intel.com>,
	Allison Randal <allison@lohutok.net>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Network Development <netdev@vger.kernel.org>,
	bpf@vger.kernel.org
Subject: Re: [PATCH 12/16] arm64: prefer __section from compiler_attributes.h
Date: Tue, 13 Aug 2019 14:36:06 +0200	[thread overview]
Message-ID: <CANiq72mAfJ23PyWzZAELgbKQDCX2nvY0z+dmOMe14qz=wa6eFg@mail.gmail.com> (raw)
In-Reply-To: <20190813082744.xmzmm4j675rqiz47@willie-the-truck>

On Tue, Aug 13, 2019 at 10:27 AM Will Deacon <will@kernel.org> wrote:
>
> 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@gmail.com>
> > Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.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?

This should be cosmetic -- basically we are trying to move all users
of current available __attribute__s in compiler_attributes.h to the
__attr forms. I am also adding (slowly) new attributes that are
already used but we don't have them yet in __attr form.

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

As you prefer! Those that are not taken by a maintainer I will pick up
and send via compiler-attributes.

I would go for 5.4, since there is no particular rush anyway.

Cheers,
Miguel