From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 F1507233712 for ; Fri, 25 Apr 2025 11:15:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745579721; cv=none; b=cCaRVIJuNn2Vu4IWXuXTfVbmXoio1puobz7hPXclA0hlLTm54ClT7MxpFmnM2DEco+nzF2oY5ajJcgt5XiyvrPvYLJsuPZ7pbi5qFeTFs9WsyGCSmewGpj08djEEHU69tpFQWFauK2knmbvswN0nkAcpDBiSegO/jSQGp5gcVCA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745579721; c=relaxed/simple; bh=Jz6HwpESKskwrSDUk/MVpHJjC1/vKAJLsm/R6AHLNFk=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=ABH52JAVFfnKwU1eltW5e60+5AzL7Agxx2OGiY8UKcbV0jyFWjIYsbAHZ6keh5OLcifBoXapcM0/5w8QREPDlekLgDNT46iQOdc1M+QSwE4fNUznmq6F8CL1y5BVmFy+ZuaBjzvm4uZNR64HI/Sr5kkek7bpu10g5eZOMbmOiYc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fW8/UWV9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fW8/UWV9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5689C4CEEB; Fri, 25 Apr 2025 11:15:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745579718; bh=Jz6HwpESKskwrSDUk/MVpHJjC1/vKAJLsm/R6AHLNFk=; h=Date:From:To:Cc:In-Reply-To:References:Subject:From; b=fW8/UWV97/RnA5oJHPTKuY0ncOFjzeh/1EsSA+IWCZPeEl+G0x1LHD/G5AKPYmREw 0kum5K44MbHSGMKd0ZqCZWSyHSayaBf4T6tf488Erc2HqXjvOGKJ5cS4s/y/ipLHqf j3m2VjnCxgPWRe1H6DyMdbdRzycmOFhUhM8LSXLHEyMkD989qFz4rBDfj9msoleKvj nguhtXllG+EE2+/Q+6svD9+5D04nFmFRt0OXAePrcamVh1nZ5+1MofaR8LOa2hXYJ7 45p29V960v8XB0B2v1AGlA0wWwxMNwPFF8ZhfBKCgbt9jdnX/LSUScpZIOTmlxWqk8 5ULh+lVng7RLQ== Received: from phl-compute-05.internal (phl-compute-05.phl.internal [10.202.2.45]) by mailfauth.phl.internal (Postfix) with ESMTP id 8435B120006C; Fri, 25 Apr 2025 07:15:16 -0400 (EDT) Received: from phl-imap-11 ([10.202.2.101]) by phl-compute-05.internal (MEProxy); Fri, 25 Apr 2025 07:15:16 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvhedvudelucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggv pdfurfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpih gvnhhtshculddquddttddmnecujfgurhepofggfffhvfevkfgjfhfutgfgsehtjeertder tddtnecuhfhrohhmpedftehrnhguuceuvghrghhmrghnnhdfuceorghrnhgusehkvghrnh gvlhdrohhrgheqnecuggftrfgrthhtvghrnhepjeejffetteefteekieejudeguedvgfef feeitdduieekgeegfeekhfduhfelhfevnecuvehluhhsthgvrhfuihiivgeptdenucfrrg hrrghmpehmrghilhhfrhhomheprghrnhguodhmvghsmhhtphgruhhthhhpvghrshhonhgr lhhithihqdduvdekhedujedtvdegqddvkeejtddtvdeigedqrghrnhgupeepkhgvrhhnvg hlrdhorhhgsegrrhhnuggsrdguvgdpnhgspghrtghpthhtohepuddvpdhmohguvgepshhm thhpohhuthdprhgtphhtthhopegsphesrghlihgvnhekrdguvgdprhgtphhtthhopegrnh gurhgvfidrtghoohhpvghrfeestghithhrihigrdgtohhmpdhrtghpthhtohepphgvthgv rhiisehinhhfrhgruggvrggurdhorhhgpdhrtghpthhtoheprghruggssehkvghrnhgvlh drohhrghdprhgtphhtthhopehmihhnghhosehkvghrnhgvlhdrohhrghdprhgtphhtthho pegurghrfihisehlihhnuhhtrhhonhhigidruggvpdhrtghpthhtohepjhhohhhnrdhogh hnvghssheslhhinhhuthhrohhnihigrdguvgdprhgtphhtthhopehtghhlgieslhhinhhu thhrohhnihigrdguvgdprhgtphhtthhopehtohhrvhgrlhgusheslhhinhhugidqfhhouh hnuggrthhiohhnrdhorhhg X-ME-Proxy: Feedback-ID: i36794607:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 522AB2220073; Fri, 25 Apr 2025 07:15:16 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: Te1e50bc317cc892a Date: Fri, 25 Apr 2025 13:13:28 +0200 From: "Arnd Bergmann" To: "Ingo Molnar" , linux-kernel@vger.kernel.org Cc: "Ahmed S . Darwish" , "Andrew Cooper" , "Ard Biesheuvel" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "John Ogness" , "Linus Torvalds" , "Peter Zijlstra" , "Thomas Gleixner" Message-Id: <209d0668-35fa-4499-adcb-319f26254be9@app.fastmail.com> In-Reply-To: <20250425084216.3913608-1-mingo@kernel.org> References: <20250425084216.3913608-1-mingo@kernel.org> Subject: Re: [RFC PATCH 0/15] x86: Remove support for TSC-less and CX8-less CPUs Content-Type: text/plain Content-Transfer-Encoding: 7bit On Fri, Apr 25, 2025, at 10:41, Ingo Molnar wrote: > In the x86 architecture we have various complicated hardware emulation > facilities on x86-32 to support ancient 32-bit CPUs that very very few > people are using with modern kernels. This compatibility glue is sometimes > even causing problems that people spend time to resolve, which time could > be spent on other things. > > As Linus recently remarked: > > > I really get the feeling that it's time to leave i486 support behind. > > There's zero real reason for anybody to waste one second of > > development effort on this kind of issue. > > This series increases minimum kernel support features to include TSC and > CX8 (CMPXCHG8B) hardware support, which removes 486 (and derivatives) support > and early-586 (and derivatives) support. Looks all good to me, thanks for including my earlier feedback. Reviewed-by: Arnd Bergmann