linux-kernel - Re: [RESEND PATCH v2] arm64: lse: fix LSE atomics with LLVM's integrated assembler

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Message-ID: <20191114165730.GC5158@willie-the-truck>
Date:   Thu, 14 Nov 2019 16:57:30 +0000
From:   Will Deacon <will@...nel.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Murray <andrew.murray@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [RESEND PATCH v2] arm64: lse: fix LSE atomics with LLVM's
 integrated assembler

On Thu, Oct 31, 2019 at 12:57:05PM -0700, Sami Tolvanen wrote:
> Unlike gcc, clang considers each inline assembly block to be independent
> and therefore, when using the integrated assembler for inline assembly,
> any preambles that enable features must be repeated in each block.
> 
> This change defines __LSE_PREAMBLE and adds it to each inline assembly
> block that has LSE instructions, which allows them to be compiled also
> with clang's assembler.

Any chance LLVM can be fixed to avoid this bodge in the kernel?

Will