From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4C6C3E909A9 for ; Tue, 17 Feb 2026 14:10:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GV1QxuLaE1MQ2nPJWIdJ/PL2ev8fC46UWGvX81h8MSs=; b=N0pHf8DTk1kjnhdAtmpnw21CWf clkeuahOCiHJXsxTtP3X0QfFOXqi4FlDE4HjU58NMJ2a6kKKTTb1KqMijUkJ9rKasz5eAr/X1DaOk +v9Pe5elvqBkTJV+vi+ERQJRMCqBRMgu2gxi4MZZSFmHARY9mP/4BUp/LOEyIh0WBAjFqnYHiFzCa 6Ynt6J1OYm4LTMUd1otAwiKWxeWWmcTo6qAPxSuUflekmnF84BNyDgw8VygRCh2rbHOOupZfSoma1 Hz2GS0K1pMO1oE/fBzuP4Y7wtPC/SPlteXxg7KzBixcupN8S8pIPmtjJbd/GOBdLKElGLVFpmnINd C9F57+MQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vsLmQ-00000008P15-3Mxw; Tue, 17 Feb 2026 14:10:22 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vsLmN-00000008P05-1VMe for linux-arm-kernel@lists.infradead.org; Tue, 17 Feb 2026 14:10:22 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1921F409A7; Tue, 17 Feb 2026 14:10:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E285C4CEF7; Tue, 17 Feb 2026 14:10:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1771337418; bh=vn1t/wW3tD+nyVk4FWbkz8/fkTB6j0/+tsYguCyWDPY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bUhUPeWfcoazn+gG7u/46Cx60IQd8Ndc8wZOE7vyOEXNFQlyt9HmKEPCBP4zGic83 gDekwlaVWrc/a51rLZ9/dEEpt+A5vumbLBVydwJNp6wL8z+YjViqM1BNn79/D/W6Yd BVlhl8pBskar4Bm3icvXcz8UoR9jERVaw+0WuZS4= Date: Tue, 17 Feb 2026 15:10:14 +0100 From: Greg KH To: Ryan Roberts Cc: stable@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jack Aboutboul , Sharath George John , Noah Meyerhans , Jim Perrin Subject: Re: [PATCH 6.6 0/3] arm64: Speed up boot with faster linear map creation Message-ID: <2026021718-citrus-parakeet-dc60@gregkh> References: <20260217133411.2881311-1-ryan.roberts@arm.com> <2026021700-chafe-jurist-cb24@gregkh> <17c9efaf-6c33-4485-bde2-345cc15ac000@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <17c9efaf-6c33-4485-bde2-345cc15ac000@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260217_061019_418704_B25EC595 X-CRM114-Status: GOOD ( 20.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Feb 17, 2026 at 01:58:36PM +0000, Ryan Roberts wrote: > On 17/02/2026 13:50, Greg KH wrote: > > On Tue, Feb 17, 2026 at 01:34:05PM +0000, Ryan Roberts wrote: > >> Hi All, > >> > >> This series is a backport that applies to stable kernel 6.6 (base v6.6.126), for > >> some speed ups to enable significantly faster booting on systems with a lot of > >> memory. The patches were originally posted at: > >> > >> https://lore.kernel.org/linux-arm-kernel/20240412131908.433043-1-ryan.roberts@arm.com/ > >> > >> ... and were originally merged upstream in v6.10-rc1. > >> > >> I'm requesting this be merged to stable on behalf of a partner who wants to get > >> the benefit of this series in Debian 12. > > > > Why can't they just use a newer kernel version (i.e. 6.12)? Surely they > > would be able to justify moving to a newer kernel for performance > > reasons, why enable them to stay on an older one, just delaying the > > inevitable upgrade they will have to do anyway in a year or so? > > I can't answer this presicely, but I did ask and push for that approach. As I > understand it, they are stuck with Debian 12, which is stuck with kernel 6.1. > The Debian maintainer apparently requested that these go through stable in order > to get them into Debian 12. I understand the position of Debian not wanting to take patches for new features that are not already upstream, but really, Debian offers a newer kernel for hardware that wants to use it for things like this, right? Why not just use that instead? thanks, greg k-h