linux-kernel - Re: [PATCH v2 00/11] x86: 32-bit cleanups

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Message-ID: <CAHp75VcBV9KyRsgKkB1Y=vmQhxYw2jy4UnBLHH4Sa8dnNwQwGA@mail.gmail.com>
Date: Tue, 10 Dec 2024 17:43:18 +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>
Subject: Re: [PATCH v2 00/11] x86: 32-bit cleanups

On Tue, Dec 10, 2024 at 4:49 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> [sorry for sending a duplicate series, I just noticed I had
>  dropped lkml from cc when I sent this a few minutes ago]
>
> While looking at 32-bit arm cleanups, I came across some related topics
> on x86 and ended up making a series for those as well.
>
> Primarily this is about running 32-bit kernels on 64-bit hardware,
> which usually works but should probably be discouraged more clearly by
> only providing support for features that are used on real 32-bit hardware:
>
> I found only a few 2003-era high-end servers (HP DL740 and DL760 G2)
> that were the only possible remaining uses of HIGHMEM64G and BIGSMP after
> the removal of 32-bit NUMA machines in 2014. Similary, there is only

Similarly

> one generation of hardware with support for VT-x.  All these features
> can be removed without hurting users.
>
> In the CPU selection, building a 32-bit kernel optimized for AMD K8
> or Intel Core2 is anachronistic, so instead only 32-bit CPU types need
> to be offered as optimization targets. The "generic" target on 64-bit
> turned out to be slightly broken, so I included a fix for that as well.

...

>   x86: document X86_INTEL_MID as 64-bit-only

Acked-by: Andy Shevchenko <andy@...nel.org>

-- 
With Best Regards,
Andy Shevchenko