linux-kernel - Re: [PATCH] x86: add more x86-64 micro-architecture levels

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Message-ID: <7760553a-6410-4017-be7b-feda4109c0d5@intel.com>
Date: Sun, 15 Sep 2024 05:53:55 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Borislav Petkov <bp@...en8.de>, John <therealgraysky@...ton.me>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, Unknown <x86@...nel.org>,
 "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: add more x86-64 micro-architecture levels

On 9/15/24 05:49, Borislav Petkov wrote:
> So this is not going anywhere. But hey, I'm always open to nice
> surprises...

Oh, gah, and I just realized that this is doing "-march" and not
"-mtune".  So this really can build binaries that won't even run on
older CPUs.

That's just mean.

So there needs to be a lot more justification before we go down this road.