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Date: Sun, 14 Jan 2018 12:39:14 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: David Woodhouse <dwmw@amazon.co.uk>
cc: Andi Kleen <ak@linux.intel.com>, Paul Turner <pjt@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Kees Cook <keescook@google.com>,
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        Andy Lutomirski <luto@amacapital.net>,
        Jiri Kosina <jikos@kernel.org>, gnomes@lxorguk.ukuu.org.uk,
        x86@kernel.org, thomas.lendacky@amd.com,
        Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: [PATCH] x86/retpoline: Fill RSB on context switch for affected
 CPUs
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On Fri, 12 Jan 2018, David Woodhouse wrote:
> +/* Check for Skylake-like CPUs (for RSB handling) */
> +static bool __init is_skylake_era(void)
> +{
> +	if (boot_cpu_data.x86 == 6) {

This wants a checkfor vendor = intel 

> +		switch (boot_cpu_data.x86_model) {
> +		case INTEL_FAM6_SKYLAKE_MOBILE:
> +		case INTEL_FAM6_SKYLAKE_DESKTOP:
> +		case INTEL_FAM6_SKYLAKE_X:
> +		case INTEL_FAM6_KABYLAKE_MOBILE:
> +		case INTEL_FAM6_KABYLAKE_DESKTOP:
> +			return true;
> +		}
> +	}

Thanks,

	tglx