linux-kernel - Re: [PATCH 13/15] arm64: fix mrs_s/msr

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Message-ID: <20171109164542.GB10540@samitolvanen.mtv.corp.google.com>
Date:   Thu, 9 Nov 2017 08:45:42 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Alex Matveev <alxmtvv@...il.com>
Subject: Re: [PATCH 13/15] arm64: fix mrs_s/msr_s macros for clang LTO

On Wed, Nov 08, 2017 at 12:25:55PM +0300, Yury Norov wrote:
> The patch below uses trick with undefining mrs_s/msr_s immediately
> after use to solve the problem. It works for both gcc and clang.

Great, looks good to me! I tested the patch with LTO and clang's integrated
assembler seems to be happy with it.

> It has solved many problems you also try to solve, and some patches
> are looking very similar.

I haven't had a closer look at the gcc LTO patches yet, but I am definitely
all for using common code where possible.

Sami