From: Tony Lindgren <tony@atomide•com>
To: Stefan Agner <stefan@agner•ch>
Cc: nicolas.pitre@linaro•org, andrew@lunn•ch, mans@mansr•com,
robh@kernel•org, f.fainelli@gmail•com,
gregory.clement@bootlin•com, linux@armlinux•org.uk,
krzk@kernel•org, arm@kernel•org,
bcm-kernel-feedback-list@broadcom•com,
sebastian.hesselbarth@gmail•com, jason@lakedaemon•net,
arnd@arndb•de, marc.w.gonzalez@free•fr, rjui@broadcom•com,
ssantosh@kernel•org, linux-arm-kernel@lists•infradead.org,
sbranden@broadcom•com, ard.biesheuvel@linaro•org,
ndesaulniers@google•com, linux-kernel@vger•kernel.org,
kgene@kernel•org, robin.murphy@arm•com
Subject: Re: [PATCH v3 1/4] ARM: use arch_extension directive instead of arch argument
Date: Wed, 24 Apr 2019 07:12:17 -0700 [thread overview]
Message-ID: <20190424141217.GC8007@atomide.com> (raw)
In-Reply-To: <2f3d0fa7ba599f46960ad3e7419477fd@agner.ch>
* Stefan Agner <stefan@agner•ch> [190423 20:20]:
> On 11.04.2019 09:54, Stefan Agner wrote:
> > The LLVM Target parser currently does not allow to specify the security
> > extension as part of -march (see also LLVM Bug 40186 [0]). When trying
> > to use Clang with LLVM's integrated assembler, this leads to build
> > errors such as this:
> > clang-8: error: the clang compiler does not support '-Wa,-march=armv7-a+sec'
> >
> > Use ".arch_extension sec" to enable the security extension in a more
> > portable fasion. Also make sure to use ".arch armv7-a" in case a v6/v7
> > multi-platform kernel is being built.
> >
> > Note that this is technically not exactly the same as the old code
> > checked for availabilty of the security extension by calling as-instr.
> > However, there are already other sites which use ".arch_extension sec"
> > unconditionally, hence de-facto we need an assembler capable of
> > ".arch_extension sec" already today (arch/arm/mm/proc-v7.S). The
> > arch extension "sec" is available since binutils 2.21 according to
> > its documentation [1].
> >
> > [0] https://bugs.llvm.org/show_bug.cgi?id=40186
> > [1] https://sourceware.org/binutils/docs-2.21/as/ARM-Options.html
> >
> > Signed-off-by: Stefan Agner <stefan@agner•ch>
> > Acked-by: Mans Rullgard <mans@mansr•com>
> > Acked-by: Arnd Bergmann <arnd@arndb•de>
> > Acked-by: Krzysztof Kozlowski <krzk@kernel•org>
>
> Arnd, Tony,
>
> Patch 3 and 4 got merged by Gregory. I think the other two patches are
> ready to be merged too. I think they should go in together to avoid
> merge conflicts. Tony, if you agree, can you Ack patch 2 so they can get
> merged through arm-soc?
Sure I just acked it for you.
Thanks,
Tony
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next prev parent reply other threads:[~2019-04-24 14:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-11 7:54 [PATCH v3 1/4] ARM: use arch_extension directive instead of arch argument Stefan Agner
2019-04-11 7:54 ` [PATCH v3 2/4] ARM: OMAP2: drop explicit assembler architecture Stefan Agner
2019-04-24 14:11 ` Tony Lindgren
2019-04-11 7:54 ` [PATCH v3 3/4] ARM: mvebu: drop unnecessary label Stefan Agner
2019-04-11 7:54 ` [PATCH v3 4/4] ARM: mvebu: prefix coprocessor operand with p Stefan Agner
2019-04-21 17:22 ` Gregory CLEMENT
2019-04-23 20:19 ` [PATCH v3 1/4] ARM: use arch_extension directive instead of arch argument Stefan Agner
2019-04-24 14:12 ` Tony Lindgren [this message]
2019-05-16 21:48 ` Olof Johansson
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