linux-kernel - Re: [PATCH 3/3] x86/mm: Move _PAGE_BIT

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Message-ID: <49769803-ad4a-4e15-a691-fd512b667ade@intel.com>
Date: Thu, 23 Oct 2025 08:12:32 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Kiryl Shutsemau <kas@...nel.org>
Cc: Usama Arif <usamaarif642@...il.com>, dwmw@...zon.co.uk,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, ardb@...nel.org, hpa@...or.com, x86@...nel.org,
 apopple@...dia.com, thuth@...hat.com, nik.borisov@...e.com,
 linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
 kernel-team@...a.com, Michael van der Westhuizen <rmikey@...a.com>,
 Tobias Fleig <tfleig@...a.com>
Subject: Re: [PATCH 3/3] x86/mm: Move _PAGE_BIT_NOPTISHADOW from bit 58 to bit
 9

On 10/23/25 07:24, Kiryl Shutsemau wrote:
> The last patch allows us to only update the kernel that has 5-level
> paging enabled, making it much easier logistically.
> 
> The fix seems trivial, and I don't see any downsides.

What I'm hearing is: Please change mainline so $COMPANY can do fewer
backports.

Yeah, it's pretty trivial. But I'm worried about the precedent, and I'm
worried that the change doesn't do a thing for mainline. It's pure
churn. Churn has inherent downsides.

I'd urge you to kick this out of the series and focus on the bug fixes
that are unambiguously good for everyone. Let's have a nice big flamewar
in another thread.