On Wed, Apr 24, 2019 at 07:12:17AM -0700, Tony Lindgren wrote:

* Stefan Agner [off-list ref] [190423 20:20]:

quoted

On 11.04.2019 09:54, Stefan Agner wrote:

quoted

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 <redacted>
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.

Hi,

These came in right around when I did the last patches for this merge
window. I'll apply them once -rc1 is out for next release.


-Olof

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