linux-kernel - Re: [PATCH 09/11] x86: rework CONFIG_GENERIC

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Message-ID: <Z1F6AIjZdjv7igVp@smile.fi.intel.com>
Date: Thu, 5 Dec 2024 12:01:36 +0200
From: Andy Shevchenko <andy@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthew Wilcox <willy@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Davide Ciminaghi <ciminaghi@...dd.com>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 09/11] x86: rework CONFIG_GENERIC_CPU compiler flags

On Thu, Dec 05, 2024 at 10:46:25AM +0100, Arnd Bergmann wrote:
> On Thu, Dec 5, 2024, at 00:33, Linus Torvalds wrote:
> > On Wed, 4 Dec 2024 at 11:44, Arnd Bergmann <arnd@...db.de> wrote:

...

> I did come across a remaining odd problem with this, as Crusoe and
> GeodeLX both identify as Family 5 but have CMOV.  Trying to use
> a CONFIG_M686+CONFIG_X86_GENERIC on these runs fails with a boot
> error "This kernel requires a 686 CPU but only detected a 586 CPU".

It might be also that Intel Quark is affected same way.

> As a result, the Debian 686 kernel binary gets built with
> CONFIG_MGEODE_LX , which seems mildly wrong but harmful enough
> to require a change in how we handle the levels.

-- 
With Best Regards,
Andy Shevchenko