From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2C47397925 for ; Fri, 21 Aug 2026 11:28:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787311740; cv=none; b=jRrrW+U4d7Bkn7oRN++J759JjVlf2MY6e4qFrhiwM0FMbqh60QmDYb4if7bBnOHKtgPckRV/74VjOR6IKcHE309XYjH1gZb0rrUdU5pYYskJwte3dtOHTgCazg5XNAlz8T3GnKrJaOkf2lHuAYIsw8OtUIWSc+Rp2PfcRO0BKrI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787311740; c=relaxed/simple; bh=F9QcWw5U/KGJrPajkosmYtFPWiecs2Hx86hOogKtNVI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aukymNxflZZ7rD/qMd2+OciBGkfeeMx8Or63FFiREtvBe5PA1+PKmFQTM4hESGKCYVQp9hbZAdRQ4TADwJSC7bYXYhrPT/NjDTHaxUhJMXuOGN1Gve0zc8JCgT8n7kskvT1HcZrNbewlYx3ylmLHkfyITXdKphtwVXqGjSUUtnc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=VDT8R35J; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VDT8R35J" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=F9QcWw5U/KGJrPajkosmYtFPWiecs2Hx86hOogKtNVI=; b=VDT8R35JhrpsyK5Yt0Rf/PxGO7 u+0F5ytWxQe/5KUmgCsKXLeTr0ekx5uWfa/MF8a23cCnTU9pZQ6Ic27BSs/4DAJX3CH/ygg94u6ip tAsmCDUJXdBlNeaB6opxCarR2K5HgDKEM9XfD483kO9l11z2SYZeM6MXYnFSG5Rj/zo4jKWjJNkDY bhBc46P5rsy7TjWaK5iOgcrNY4wopu5gIzuEMvpQzsSs3Vju3w8YUbgdwpy630oesY5HrKtZbCNoZ 1POMOWvw8/nIov9h/7xwrkgwaNcVhY6ViovzP3wOv/EEvszmapSnSlyh8eWo/Ku7c3dmJLzPcCLr8 SPujucfg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxNQQ-0000000HK9v-2eps; Fri, 21 Aug 2026 11:28:42 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 2EE71300324; Fri, 21 Aug 2026 13:28:42 +0200 (CEST) Date: Fri, 21 Aug 2026 13:28:42 +0200 From: Peter Zijlstra To: Dave Hansen Cc: "Luck, Tony" , "Chatre, Reinette" , "Chen, Yu C" , "tglx@kernel.org" , "bp@alien8.de" , "mingo@redhat.com" , "dave.hansen@linux.intel.com" , "hpa@zytor.com" , "fenghuay@nvidia.com" , "babu.moger@amd.com" , "chen.yu@linux.dev" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v6 2/9] x86/resctrl: Require 64-bit x86 for resctrl support Message-ID: <20260821112842.GD1837346@noisy.programming.kicks-ass.net> References: <980c4d9c15862de0b0dbc535b646f6b96ea46abe.1784968626.git.yu.c.chen@intel.com> <6c933b5c-620d-4684-b651-48a7ebdfc956@intel.com> <7911abea-d508-4401-b6de-2f6f598f08bf@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Aug 20, 2026 at 10:12:29AM -0700, Dave Hansen wrote: > Honestly, the only people who complain about 32-bit support going away > are folks who "test" it regularly. It's quite rare to see anyone > actually "using" a 32-bit system. I've for a long time advocated detecting LM during the 32bit boot and simply aborting with a message: "Go run the x86_64 kernel!".