linux-kernel - Re: [PATCH AUTOSEL 4.19 41/47] arm64/sve: Add stub for sve_max_virtualisable

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Date:   Tue, 9 Nov 2021 13:20:44 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Mark Brown <broonie@...nel.org>, Will Deacon <will@...nel.org>,
        maz@...nel.org, Dave.Martin@....com, tanxiaofei@...wei.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 4.19 41/47] arm64/sve: Add stub for
 sve_max_virtualisable_vl()

On Mon, Nov 08, 2021 at 12:50:25PM -0500, Sasha Levin wrote:
> From: Mark Brown <broonie@...nel.org>
> 
> [ Upstream commit 49ed920408f85fb143020cf7d95612b6b12a84a2 ]
> 
> Fixes build problems for configurations with KVM enabled but SVE disabled.
> 
> Reported-by: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Mark Brown <broonie@...nel.org>
> Link: https://lore.kernel.org/r/20211022141635.2360415-2-broonie@kernel.org
> Signed-off-by: Will Deacon <will@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  arch/arm64/include/asm/fpsimd.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h
> index dd1ad3950ef5d..5bd799ea683b4 100644
> --- a/arch/arm64/include/asm/fpsimd.h
> +++ b/arch/arm64/include/asm/fpsimd.h
> @@ -130,6 +130,11 @@ static inline void fpsimd_release_task(struct task_struct *task) { }
>  static inline void sve_sync_to_fpsimd(struct task_struct *task) { }
>  static inline void sve_sync_from_fpsimd_zeropad(struct task_struct *task) { }
>  
> +static inline int sve_max_virtualisable_vl(void)
> +{
> +	return 0;
> +}

IIRC this fix was only needed for 5.16-rc1.

-- 
Catalin