linux-kernel - Re: [PATCH v2 01/29] x86: treewide: Introduce x86_vendor_amd_or

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Message-ID: <20250317174848.GJ6888@noisy.programming.kicks-ass.net>
Date: Mon, 17 Mar 2025 18:48:48 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Borislav Petkov <bp@...en8.de>
Cc: "Ahmed S. Darwish" <darwi@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	John Ogness <john.ogness@...utronix.de>, x86@...nel.org,
	x86-cpuid@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/29] x86: treewide: Introduce
 x86_vendor_amd_or_hygon()

On Mon, Mar 17, 2025 at 06:32:16PM +0100, Borislav Petkov wrote:
> On Mon, Mar 17, 2025 at 05:47:17PM +0100, Ahmed S. Darwish wrote:
> > The pattern to check if an x86 vendor is AMD or HYGON (or not both) is
> > pretty common.  Introduce x86_vendor_amd_or_hygon() at <asm/processor.h>
> 
> So if we need to check "intel too", we do
> 
> x86_vendor_amd_or_hygon_or_intel?
> 
> Nah, this is silly.

Would it make more sense to have a Zen1 feature and check that instead?

Because, IIRC Hygon is simply a Zen1 copy.