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Wed, 05 Jun 2019 12:05:37 -0700 (PDT) Received: from [10.67.49.123] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id j20sm18062211pff.183.2019.06.05.12.05.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Jun 2019 12:05:36 -0700 (PDT) Subject: Re: [PATCH v4 1/2] ARM: use arch_extension directive instead of arch argument To: Stefan Agner , arm@kernel.org, olof@lixom.net Cc: linux@armlinux.org.uk, arnd@arndb.de, ard.biesheuvel@linaro.org, robin.murphy@arm.com, nico@fluxnic.net, f.fainelli@gmail.com, rjui@broadcom.com, sbranden@broadcom.com, bcm-kernel-feedback-list@broadcom.com, kgene@kernel.org, krzk@kernel.org, robh@kernel.org, ssantosh@kernel.org, jason@lakedaemon.net, andrew@lunn.ch, gregory.clement@bootlin.com, sebastian.hesselbarth@gmail.com, tony@atomide.com, marc.w.gonzalez@free.fr, mans@mansr.com, ndesaulniers@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: From: Florian Fainelli Openpgp: preference=signencrypt Autocrypt: addr=florian.fainelli@broadcom.com; prefer-encrypt=mutual; keydata= mQENBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB AAG0MEZsb3JpYW4gRmFpbmVsbGkgPGZsb3JpYW4uZmFpbmVsbGlAYnJvYWRjb20uY29tPokB xAQQAQgArgUCXJvPrRcKAAG/SMv+fS3xUQWa0NryPuoRGjsA3SAUAAAAAAAWAAFrZXktdXNh Z2UtbWFza0BwZ3AuY29tjDAUgAAAAAAgAAdwcmVmZXJyZWQtZW1haWwtZW5jb2RpbmdAcGdw LmNvbXBncG1pbWUICwkIBwMCAQoFF4AAAAAZGGxkYXA6Ly9rZXlzLmJyb2FkY29tLmNvbQUb AwAAAAMWAgEFHgEAAAAEFQgJCgAKCRCBMbXEKbxmoE4DB/9JySDRt/ArjeOHOwGA2sLR1DV6 Mv6RuStiefNvJ14BRfMkt9EV/dBp9CsI+slwj9/ZlBotQXlAoGr4uivZvcnQ9dWDjTExXsRJ WcBwUlSUPYJc/kPWFnTxF8JFBNMIQSZSR2dBrDqRP0UWYJ5XaiTbVRpd8nka9BQu4QB8d/Bx VcEJEth3JF42LSF9DPZlyKUTHOj4l1iZ/Gy3AiP9jxN50qol9OT37adOJXGEbix8zxoCAn2W +grt1ickvUo95hYDxE6TSj4b8+b0N/XT5j3ds1wDd/B5ZzL9fgBjNCRzp8McBLM5tXIeTYu9 mJ1F5OW89WvDTwUXtT19P1r+qRqKuQENBFPAG8EBCACsa+9aKnvtPjGAnO1mn1hHKUBxVML2 C3HQaDp5iT8Q8A0ab1OS4akj75P8iXYfZOMVA0Lt65taiFtiPT7pOZ/yc/5WbKhsPE9dwysr vHjHL2gP4q5vZV/RJduwzx8v9KrMZsVZlKbvcvUvgZmjG9gjPSLssTFhJfa7lhUtowFof0fA q3Zy+vsy5OtEe1xs5kiahdPb2DZSegXW7DFg15GFlj+VG9WSRjSUOKk+4PCDdKl8cy0LJs+r W4CzBB2ARsfNGwRfAJHU4Xeki4a3gje1ISEf+TVxqqLQGWqNsZQ6SS7jjELaB/VlTbrsUEGR 1XfIn/sqeskSeQwJiFLeQgj3ABEBAAGJAkEEGAECASsFAlPAG8IFGwwAAADAXSAEGQEIAAYF AlPAG8EACgkQk2AGqJgvD1UNFQgAlpN5/qGxQARKeUYOkL7KYvZFl3MAnH2VeNTiGFoVzKHO e7LIwmp3eZ6GYvGyoNG8cOKrIPvXDYGdzzfwxVnDSnAE92dv+H05yanSUv/2HBIZa/LhrPmV hXKgD27XhQjOHRg0a7qOvSKx38skBsderAnBZazfLw9OukSnrxXqW/5pe3mBHTeUkQC8hHUD Cngkn95nnLXaBAhKnRfzFqX1iGENYRH3Zgtis7ZvodzZLfWUC6nN8LDyWZmw/U9HPUaYX8qY MP0n039vwh6GFZCqsFCMyOfYrZeS83vkecAwcoVh8dlHdke0rnZk/VytXtMe1u2uc9dUOr68 7hA+Z0L5IQAKCRCBMbXEKbxmoLoHCACXeRGHuijOmOkbyOk7x6fkIG1OXcb46kokr2ptDLN0 Ky4nQrWp7XBk9ls/9j5W2apKCcTEHONK2312uMUEryWI9BlqWnawyVL1LtyxLLpwwsXVq5m5 sBkSqma2ldqBu2BHXZg6jntF5vzcXkqG3DCJZ2hOldFPH+czRwe2OOsiY42E/w7NUyaN6b8H rw1j77+q3QXldOw/bON361EusWHdbhcRwu3WWFiY2ZslH+Xr69VtYAoMC1xtDxIvZ96ps9ZX pUPJUqHJr8QSrTG1/zioQH7j/4iMJ07MMPeQNkmj4kGQOdTcsFfDhYLDdCE5dj5WeE6fYRxE Q3up0ArDSP1L Message-ID: <7d054879-ea11-d3e4-de5c-f35504039104@broadcom.com> Date: Wed, 5 Jun 2019 12:05:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/27/19 3:40 PM, 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 > Acked-by: Mans Rullgard > Acked-by: Arnd Bergmann > Acked-by: Krzysztof Kozlowski > --- > Changes since v1: > - Explicitly specify assembler architecture as armv7-a to avoid > build issues when bulding v6/v7 multi arch kernel. > > Changes since v2: > - Add armv7-a also in mach-tango > - Move .arch armv7-a outside of ifdef'ed area in sleep44xx.S > to make the kernel compile also without CONFIG_SMP/PM. > > Changes since v3: > - Rebase on top of v5.2-rc2 > > arch/arm/mach-bcm/Makefile | 3 --- For mach-bcm: Acked-by: Florian Fainelli -- Florian