linux-kernel - Re: [kvm-unit-tests PATCH 0/3] Fix arm64 clang errors on fpu tests

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Message-ID: <20241022-2c60a0bcbb908435aa91d1ff@orel>
Date: Tue, 22 Oct 2024 15:10:31 +0200
From: Andrew Jones <andrew.jones@...ux.dev>
To: Raghavendra Rao Ananta <rananta@...gle.com>
Cc: Subhasish Ghosh <subhasish.ghosh@....com>, 
	Joey Gouly <joey.gouly@....com>, Oliver Upton <oliver.upton@...ux.dev>, 
	Marc Zyngier <maz@...nel.org>, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [kvm-unit-tests PATCH 0/3] Fix arm64 clang errors on fpu tests

On Tue, Oct 22, 2024 at 12:47:07AM +0000, Raghavendra Rao Ananta wrote:
> When compiled with clang for arm64, some build errors were observed
> along the fpu code. Moreover, data aborts were seen while running
> the arm/fpu test due to misconfigured input/output args in the inline
> assembly.
> 
> The series tries to addresses these issues.
> 
> - Raghavendra
> 
> Raghavendra Rao Ananta (3):
>   arm: Fix clang error in sve_vl()
>   arm: fpu: Convert 'q' registers to 'v' to satisfy clang
>   arm: fpu: Fix the input/output args for inline asm in fpu.c
> 
>  arm/fpu.c                 | 46 +++++++++++++++++++--------------------
>  lib/arm64/asm/processor.h |  2 +-
>  2 files changed, 24 insertions(+), 24 deletions(-)
> 
> 
> base-commit: f246b16099478a916eab37b9bd1eb07c743a67d5
> -- 
> 2.47.0.105.g07ac214952-goog
>

Hi Raghavendra,

With clang 18.1.8 (Fedora 18.1.8-1.fc40) I get a bunch of errors like
these

    arm/fpu.c:281:3: error: instruction requires: fp-armv8

I used my cross-clang series[1] and configured with

    ./configure --arch=arm64 --cc=clang --cflags='--target=aarch64' --cross-prefix=aarch64-linux-gnu-

[1] https://lore.kernel.org/all/20240911091406.134240-7-andrew.jones@linux.dev/

Thanks,
drew