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X-CSE-ConnectionGUID: 4wv7lFwIQKumJTjzMbyz7Q== X-CSE-MsgGUID: oRxpjziOQhe0E/eLgFSw4A== X-IronPort-AV: E=McAfee;i="6800,10657,11531"; a="63327414" X-IronPort-AV: E=Sophos;i="6.17,312,1747724400"; d="scan'208";a="63327414" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 08:12:33 -0700 X-CSE-ConnectionGUID: 0r6g1zmVSwK2AoHwrY6sKA== X-CSE-MsgGUID: 9jVp4OkQSnGmAczotj9xQg== X-ExtLoop1: 1 Received: from tfalcon-desk.amr.corp.intel.com (HELO [10.125.108.251]) ([10.125.108.251]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 08:12:32 -0700 Message-ID: <49769803-ad4a-4e15-a691-fd512b667ade@intel.com> Date: Thu, 23 Oct 2025 08:12:32 -0700 Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] x86/mm: Move _PAGE_BIT_NOPTISHADOW from bit 58 to bit 9 To: Kiryl Shutsemau Cc: Usama Arif , dwmw@amazon.co.uk, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, ardb@kernel.org, hpa@zytor.com, x86@kernel.org, apopple@nvidia.com, thuth@redhat.com, nik.borisov@suse.com, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, kernel-team@meta.com, Michael van der Westhuizen , Tobias Fleig References: <20251022220755.1026144-1-usamaarif642@gmail.com> <20251022220755.1026144-4-usamaarif642@gmail.com> <98bc658f-2ec6-43f5-a7e1-e9424450a850@intel.com> <797c78f4-1a90-42da-9fed-e87682456a43@gmail.com> <90047889-3b90-4c6a-90ed-f155c92f7ce1@intel.com> Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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.