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

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Message-ID: <20171109165009.GC10540@samitolvanen.mtv.corp.google.com>
Date:   Thu, 9 Nov 2017 08:50:09 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Yury Norov <ynorov@...iumnetworks.com>,
        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>,
        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 04:02:22PM -0800, Andi Kleen wrote:
> There's also older patches to enable single-pass-linking for kallsyms,
> which is extremly useful for LTO build performance.

Excellent, can you point me to the patch in question?

I worked around the build performance problem by reusing vmlinux.o for
kallsyms instead of linking all bitcode again in each step. I'm not sure
if this is feasible with gcc.

Sami