linux-kernel - Re: [PATCH v2 7/7] arm64: nofpsmid: Handle TIF_FOREIGN

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Message-ID: <20200110144948.GC8786@arrakis.emea.arm.com>
Date:   Fri, 10 Jan 2020 14:49:49 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will@...nel.org, maz@...nel.org, mark.rutland@....com,
        dave.martin@....com, ard.biesheuvel@...aro.org,
        christoffer.dall@....com
Subject: Re: [PATCH v2 7/7] arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag
 cleanly

On Tue, Dec 17, 2019 at 06:34:02PM +0000, Suzuki K Poulose wrote:
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 3eb338f14386..240c52b71cda 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -269,7 +269,7 @@ static void sve_free(struct task_struct *task)
>   */
>  static void task_fpsimd_load(void)
>  {
> -	WARN_ON(!have_cpu_fpsimd_context());
> +	WARN_ON(!system_supports_fpsimd() || !have_cpu_fpsimd_context());

Nitpick: in the other functions you kept to WARN_ONs, apart from this
one where you added a ||.

Other than the KVM bits:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>