linux-kernel - Re: [PATCH v5 01/27] arm64: cpufeature: Set SYSREG_GIC

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Date:   Fri, 21 Sep 2018 16:56:47 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <daniel.thompson@...aro.org>,
        <joel@...lfernandes.org>, <mark.rutland@....com>,
        <christoffer.dall@....com>, <james.morse@....com>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v5 01/27] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature

On Tue, 28 Aug 2018 16:51:11 +0100,
Julien Thierry <julien.thierry@....com> wrote:
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Suggested-by: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>
> ---
>  arch/arm64/kernel/cpufeature.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index e238b79..1e433ac 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -1039,7 +1039,7 @@ static void cpu_has_fwb(const struct arm64_cpu_capabilities *__unused)
>  	{
>  		.desc = "GIC system register CPU interface",
>  		.capability = ARM64_HAS_SYSREG_GIC_CPUIF,
> -		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
> +		.type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
>  		.matches = has_useable_gicv3_cpuif,
>  		.sys_reg = SYS_ID_AA64PFR0_EL1,
>  		.field_pos = ID_AA64PFR0_GIC_SHIFT,
> -- 
> 1.9.1
> 

This definitely deserves a commit message, such as:

"We do not support systems where some CPUs have an operational GICv3
 CPU interface, and some don't. Let's make this requirement obvious by
 flagging the GICv3 capability as being strict."

Thanks,

	M.

-- 
Jazz is not dead, it just smell funny.