linux-kernel - Re: [PATCH v6 07/16] x86/pci: Add Hygon Dhyana support to PCI and north bridge

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Date:   Thu, 20 Sep 2018 09:25:09 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Lendacky, Thomas" <Thomas.Lendacky@....com>
cc:     Pu Wen <puwen@...on.cn>, "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v6 07/16] x86/pci: Add Hygon Dhyana support to PCI and
 north bridge

On Wed, 19 Sep 2018, Lendacky, Thomas wrote:
> 
> To be compatible with "before this patch" you should probably do:
> 
> 	if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
> 		root_ids = hygon_root_ids;
> 		misc_ids = hygon_nb_misc_ids;
> 		link_ids = hygon_nb_link_ids;
> 	} else {
> 		root_ids = amd_root_ids;
> 		misc_ids = amd_nb_misc_ids;
> 		link_ids = amd_nb_link_ids;
> 	}
> 
> That way they are always the AMD values if not your chip.

And please can we have a comment why this is called on anything which is
not AMD or HYGON. It's all but obvious and clearly unexpected.

Thanks,

	tglx