linux-kernel - Re: [PATCH 06/11] x86/fault: Improve kernel-executing-user-memory handling

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Date:   Mon, 1 Feb 2021 09:08:40 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 06/11] x86/fault: Improve kernel-executing-user-memory
 handling

On Sun, Jan 31, 2021 at 09:24:37AM -0800, Andy Lutomirski wrote:
>  #if defined(CONFIG_X86_64) && defined(CONFIG_CPU_SUP_AMD)
> +	if (likely(boot_cpu_data.x86_vendor != X86_VENDOR_AMD
> +		   || boot_cpu_data.x86 != 0xf))

Same nitpick as for the other patch.  Maybe we wan a little inline
helper for the specific erratum that includes the vendor and family
checks in adddition to using IS_ENABLED for the config options?