linux-kernel - Re: [PATCH] arm64: support _

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Message-ID: <20180424141729.r7wfnos3p2kdt3ez@lakrids.cambridge.arm.com>
Date:   Tue, 24 Apr 2018 15:17:29 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Will Deacon <will.deacon@....com>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH] arm64: support __int128 with clang

On Tue, Apr 24, 2018 at 02:56:09PM +0100, Mark Rutland wrote:
> I belevie that currently it is not possible to use a released version of
> clang to build a working kernel without additional patches (at least
> 5.0.0, there don't seem to be any 6.0.0 binaries that can target
> AArch64). Issues include:
> 
> * Released versions of clang don't support the 's' constraint used in
>   some hyp code.
> 

> * Released versions of clang don't support 'rX' as a register name, as
>   is used by some workaround code shared between arm/arm64.

This case will apparently be fixed for 6.0.1 (and presumably 7.0.0):

https://reviews.llvm.org/rL328829
https://bugs.llvm.org/show_bug.cgi?id=36862

Neither have been released yet.

Mark.