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Date: Thu, 16 Nov 2017 11:54:33 +0000
From: Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH v2 11/18] arm64: make mrs_s and msr_s macros work with LTO
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 <20171115213428.22559-12-samitolvanen@google.com>
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To: Sami Tolvanen <samitolvanen@google.com>
Cc: Alex Matveev <alxmtvv@gmail.com>, Andi Kleen <ak@linux.intel.com>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Greg Hackmann <ghackmann@google.com>, Kees Cook <keescook@chromium.org>, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>, Michal Marek <michal.lkml@markovi.net>, Nick Desaulniers <ndesaulniers@google.com>, Yury Norov <ynorov@caviumnetworks.com>, Matthias Kaehlcke <mka@chromium.org>

On Wed, Nov 15, 2017 at 01:34:21PM -0800, Sami Tolvanen wrote:
> From: Alex Matveev <alxmtvv@gmail.com>
> 
> Use UNDEFINE_MRS_S and UNDEFINE_MSR_S to define corresponding macros
> in-place and workaround gcc and clang limitations on redefining macros
> across different assembler blocks.

What limitations? Can you elaborate please? Is this a fix?

Will