linux-kernel - Re: [PATCH] arm64: fix alternatives with LLVM's integrated assembler

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Message-ID: <CABCJKueDZBd1TZyNTH-jo=DsVeze=mout1ooK5sSbPb52RyjPA@mail.gmail.com>
Date:   Mon, 14 Oct 2019 17:28:09 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] arm64: fix alternatives with LLVM's integrated assembler

On Mon, Oct 14, 2019 at 5:00 PM Will Deacon <will@...nel.org> wrote:
> Is there any benefit from supporting '-no-integrated-as' but not 'AS=clang'?
> afaict, you have to hack the top-level Makefile for that.

The goal is to eventually support AS=clang and this patch gets us one
step closer to that. However, with this patch (and the LSE one), we
can already use Clang's integrated assembler for inline assembly,
which is a requirement for compiling the kernel with LTO. Google has
shipped LTO kernels on Pixel devices for a couple of generations now.

Sami