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

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Message-ID: <CABCJKucPcqSS=8dP-6hOwGpKUYxOk8Q_Av83O0A2A85JKznypQ@mail.gmail.com>
Date:   Tue, 8 Oct 2019 08:22:07 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Andrew Murray <andrew.murray@....com>,
        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: lse: fix LSE atomics with LLVM's integrated assembler

On Mon, Oct 7, 2019 at 2:46 PM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
> I'm worried that one of these might lower to LSE atomics without
> ALTERNATIVE guards by blanketing all C code with `-march=armv8-a+lse`.

True, that's a valid concern. I think adding the directive to each
assembly block is the way forward then, assuming the maintainers are
fine with that.

Sami