linux-kernel - Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64

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Message-ID: <20240731114000.GC33588@noisy.programming.kicks-ass.net>
Date: Wed, 31 Jul 2024 13:40:00 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Shivank Garg <shivankg@....com>,
	ardb@...nel.org, bp@...en8.de, brijesh.singh@....com,
	corbet@....net, dave.hansen@...ux.intel.com, hpa@...or.com,
	jan.kiszka@...mens.com, jgross@...e.com, kbingham@...nel.org,
	linux-doc@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, luto@...nel.org,
	michael.roth@....com, mingo@...hat.com, rick.p.edgecombe@...el.com,
	sandipan.das@....com, thomas.lendacky@....com, x86@...nel.org
Subject: Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for
 x86-64

On Wed, Jul 31, 2024 at 02:36:47PM +0300, Kirill A. Shutemov wrote:
> The risk with your proposal is that 5-level paging will not get any
> testing and rot over time.
> 
> I would like to keep it on, if possible.

Well, if it is boot time, you just tell your CI to force enable 5level
and you're done, right? Then the rest of us use 4 and we all good.