linux-kernel - Re: [PATCH 04/11] x86: split CPU selection into 32-bit and 64-bit

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Message-ID: <CAHp75VcYojM8uYURbaNjquod7n_EJe58Er-57Dw0iaZFc-+i8Q@mail.gmail.com>
Date: Wed, 4 Dec 2024 20:31:01 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Arnd Bergmann <arnd@...db.de>, 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>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Andy Shevchenko <andy@...nel.org>, 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 04/11] x86: split CPU selection into 32-bit and 64-bit

On Wed, Dec 4, 2024 at 12:31 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The x86 CPU selection menu is confusing for a number of reasons.
> One of them is how it's possible to build a 32-bit kernel for
> a small number of early 64-bit microarchitectures (K8, Core2)

Core 2

It spells with a space starting with a capital letter, some issues of
the spelling below as well.

> but not the regular generic 64-bit target that is the normal
> default.
>
> There is no longer a reason to run 32-bit kernels on production
> 64-bit systems, so simplify the configuration menu by completely
> splitting the two into 32-bit-only and 64-bit-only machines.
>
> Testing generic 32-bit kernels on 64-bit hardware remains
> possible, just not building a 32-bit kernel that requires
> a 64-bit CPU.

> +choice
> +       prompt "x86-64 Processor family"
> +       depends on X86_64
> +       default GENERIC_CPU
> +       help
> +         This is the processor type of your CPU. This information is
> +         used for optimizing purposes. In order to compile a kernel
> +         that can run on all supported x86 CPU types (albeit not
> +         optimally fast), you can specify "Generic-x86-64" here.
> +
> +         Here are the settings recommended for greatest speed:
> +         - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.
> +         - "Intel P4" for the Pentium 4/Netburst microarchitecture.
> +         - "Core 2/newer Xeon" for all core2 and newer Intel CPUs.

Core 2

> +         - "Intel Atom" for the Atom-microarchitecture CPUs.
> +         - "Generic-x86-64" for a kernel which runs on any x86-64 CPU.
> +
> +         See each option's help text for additional details. If you don't know
> +         what to do, choose "Generic-x86-64".

-- 
With Best Regards,
Andy Shevchenko