linux-kernel - Re: [PATCH] cpufreq/intel_pstate: Load only on Intel hardware

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Message-ID: <1751498.6LRAoAyAK1@aspire.rjw.lan>
Date:   Tue, 02 Apr 2019 10:38:52 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Erwan Velu <e.velu@...teo.com>,
        LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH] cpufreq/intel_pstate: Load only on Intel hardware

On Monday, April 1, 2019 5:03:45 PM CEST Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> This driver is Intel-only so loading on anything which is not Intel is
> pointless. Prevent it from doing so.
> 
> While at it, correct the "not supported" print statement to say CPU
> "model" which is what that test does.
> 
> Suggested-by: Erwan Velu <e.velu@...teo.com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-pm@...r.kernel.org
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> CC: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/cpufreq/intel_pstate.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index b599c7318aab..2986119dd31f 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -2596,6 +2596,9 @@ static int __init intel_pstate_init(void)
>  	const struct x86_cpu_id *id;
>  	int rc;
>  
> +	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
> +		return -ENODEV;
> +
>  	if (no_load)
>  		return -ENODEV;
>  
> @@ -2611,7 +2614,7 @@ static int __init intel_pstate_init(void)
>  	} else {
>  		id = x86_match_cpu(intel_pstate_cpu_ids);
>  		if (!id) {
> -			pr_info("CPU ID not supported\n");
> +			pr_info("CPU model not supported\n");
>  			return -ENODEV;
>  		}
>  
> 

Applied, thanks!