From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fout-b7-smtp.messagingengine.com (fout-b7-smtp.messagingengine.com [202.12.124.150]) (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 7C8B93D0D5; Wed, 4 Dec 2024 20:38:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.12.124.150 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733344720; cv=none; b=V+x5z8jpFR95jBPYqknPHkmKV72Fhr/eNlVnQnPh/p42WqafmQ3NQGD4ly079AEVXRIOu7BcwoblU5MiI3pRlWtJc5xN07GpVegPFrRhtSHEXElxr6m1BBYFrK1i7TqGJ25C4aVSJ+u+VcOR5iDX+CJnUJ3o/d9QoNUnhrSXze4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733344720; c=relaxed/simple; bh=VQBTDrrTUucSRw8JgUt8ni66mHo0/auasFVHGVJMEzI=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=Z7ExpYlU/zdlPEVQGgoC8w9OMt4QFNjtWfS6PK26nZM6Vh1CCj/BnUH8BRcO8W9y3J/QvWQCYM+KlpD0iPZQ8TS/CW0vJOegR6nT0mpD6ONLyGCjOKHyYewJOx1/ZxKoKnF5PRAa7njfffeltrFImj15NjsY1pzF1MkcZLSI/T0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de; spf=pass smtp.mailfrom=arndb.de; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b=qoCHFVF4; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=V0SSfTMk; arc=none smtp.client-ip=202.12.124.150 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arndb.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arndb.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=arndb.de header.i=@arndb.de header.b="qoCHFVF4"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="V0SSfTMk" Received: from phl-compute-10.internal (phl-compute-10.phl.internal [10.202.2.50]) by mailfout.stl.internal (Postfix) with ESMTP id 104B31140171; Wed, 4 Dec 2024 15:38:37 -0500 (EST) Received: from phl-imap-11 ([10.202.2.101]) by phl-compute-10.internal (MEProxy); Wed, 04 Dec 2024 15:38:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm3; t=1733344716; x=1733431116; bh=ksk/xRcQCZNYpbBOvPXhkI3woRZO+aaqHCZZvSVVLLw=; b= qoCHFVF4S5D2doDweDzCR4Ylyq8+iJA2Up03bTAnYLbmxRXQYJj7j3dcCWpQ3lY4 OHUp1dm2BVtiEu3MrA2q5ydj8+mRE7QBCqp0ECCp0VKB3PLBtgEo0mcRIFBPb33x 1ddeIEHFVFcM5s68EYf3i1px0E8Z3viKt+vqhwoagDxMw+kKK2k+/YFcAugMVQLP Z/zGclMKCapYGS2EBQJzexoGYUUKHcVkHeqAvk94Akr/YuP7GG3VTBLkNaaJ+SsU wtqmE+7d+6o3KLQ3quxb7TsVWdj6ptxaSTeiBN3Dm1ELxvHCHxgCHxTFpfTGpuWN 1mPxAbxmu5tEsIjVb1jSaA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t=1733344716; x= 1733431116; bh=ksk/xRcQCZNYpbBOvPXhkI3woRZO+aaqHCZZvSVVLLw=; b=V 0SSfTMkDud9RO0XEh9wgmA5abO7TD/+iNLFPtVPfNft6slLo9XV7+QVyruNKUFMy clOLwQoK9I/A68fArltA42j6Y/GgCCLq5cSL11YhqL9DI2owaKFgotCaZVxm4Hzr YlAodhIHstCawUKA9F11zr9Yd1EC/R1ypo0KfhHl5CwHuzl0ngY2yn7+GPPY4YdG oZW/uqDHY3IaDnAWoHc3WO4nraq/2HJQ1HxbnXe3YxoMrS66LlKAxyyoI2oi1SOb KlEh8KlbcAk0cMgfXbaQGKjyxbirWorhs7dyYq00qBDCSQRAVCponj1Upc4J57s3 1lVVUOHH7GQPimn8y6YoA== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefuddrieehgddufeehucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnh htshculddquddttddmnecujfgurhepofggfffhvfevkfgjfhfutgfgsehtqhertdertdej necuhfhrohhmpedftehrnhguuceuvghrghhmrghnnhdfuceorghrnhgusegrrhhnuggsrd guvgeqnecuggftrfgrthhtvghrnhepvdfhvdekueduveffffetgfdvveefvdelhedvvdeg jedvfeehtdeggeevheefleejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpe hmrghilhhfrhhomheprghrnhgusegrrhhnuggsrdguvgdpnhgspghrtghpthhtohepudej pdhmohguvgepshhmthhpohhuthdprhgtphhtthhopegsphesrghlihgvnhekrdguvgdprh gtphhtthhopegrnhguhidrshhhvghvtghhvghnkhhosehgmhgrihhlrdgtohhmpdhrtghp thhtohepfhhnthhothhhsehgmhgrihhlrdgtohhmpdhrtghpthhtoheptghimhhinhgrgh hhihesghhnuhguugdrtghomhdprhgtphhtthhopehsvggrnhhjtgesghhoohhglhgvrdgt ohhmpdhrtghpthhtohepfihilhhlhiesihhnfhhrrgguvggrugdrohhrghdprhgtphhtth hopegrnhguhieskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprghrnhgusehkvghrnhgv lhdrohhrghdprhgtphhtthhopeigkeeisehkvghrnhgvlhdrohhrgh X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 1DF612220072; Wed, 4 Dec 2024 15:38:36 -0500 (EST) 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 Date: Wed, 04 Dec 2024 21:38:05 +0100 From: "Arnd Bergmann" To: "Andy Shevchenko" , "Arnd Bergmann" , "Ferry Toth" Cc: linux-kernel@vger.kernel.org, x86@kernel.org, "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "Linus Torvalds" , "Andy Shevchenko" , "Matthew Wilcox" , "Sean Christopherson" , "Davide Ciminaghi" , "Paolo Bonzini" , kvm@vger.kernel.org Message-Id: <206b50a2-922f-4a29-8c1a-b8695b19e65c@app.fastmail.com> In-Reply-To: References: <20241204103042.1904639-1-arnd@kernel.org> <20241204103042.1904639-9-arnd@kernel.org> Subject: Re: [PATCH 08/11] x86: document X86_INTEL_MID as 64-bit-only Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Wed, Dec 4, 2024, at 19:55, Andy Shevchenko wrote: > +Cc: Ferry > > On Wed, Dec 4, 2024 at 12:31=E2=80=AFPM Arnd Bergmann wrote: >> >> From: Arnd Bergmann >> >> The X86_INTEL_MID code was originally introduced for the >> 32-bit Moorestown/Medfield/Clovertrail platform, later the 64-bit >> Merrifield/Moorefield variant got added, but the final > > variant got --> variants were Fixed >> Morganfield/Broxton 14nm chips were canceled before they hit >> the market. > > Inaccurate. "Broxton for Mobile", and not "Broxton" in general. Changed to "but the final Morganfield 14nm platform was canceled before it hit the market"=20 >> To help users understand what the option actually refers to, >> update the help text, and make it a hard dependency on 64-bit >> kernels. While they could theoretically run a 32-bit kernel, >> the devices originally shipped with 64-bit one in 2015, so that >> was proabably never tested. > > probably Fixed. > It's all other way around (from SW point of view). For unknown reasons > Intel decided to release only 32-bit SW and it became the only thing > that was heavily tested (despite misunderstanding by some developers > that pointed finger to the HW without researching the issue that > appears to be purely software in a few cases) _that_ time. Starting > ca. 2017 I enabled 64-bit for Merrifield and from then it's being used > by both 32- and 64-bit builds. > > I'm totally fine to drop 32-bit defaults for Merrifield/Moorefield, > but let's hear Ferry who might/may still have a use case for that. Ok. I tried to find the oldest Android image and saw it used a 64-bit kernel, but that must have been after your work then. > >> - Moorestown MID devices > > FTR, a year or so ago it was a (weak) interest to revive Medfield, but > I think it would require too much work even for the person who is > quite familiar with HW, U-Boot, and Linux kernel, so it is most > unlikely to happen. Ok. >> + >> + The only supported devices are the 22nm Merrified (Z34xx) a= nd >> + Moorefield (Z35xx) SoC used in Android devices such as the >> + Asus Zenfone 2, Asus FonePad 8 and Dell Venue 7. > > The list is missing the Intel Edison DIY platform which is probably > the main user of Intel MID kernels nowadays. Ah, that explains a lot ;-) Changed now to The only supported devices are the 22nm Merrified (Z34xx) and Moorefield (Z35xx) SoC used in the Intel Edison board and a small number of Android devices such as the Asus Zenfone 2, Asus FonePad 8 and Dell Venue 7. > ... > >> - Intel MID platforms are based on an Intel processor and chi= pset which >> - consume less power than most of the x86 derivatives. > > Why remove this? AFAIK it states the truth. It seemed irrelevant for users that configure the kernel. I've put it back now. Thanks for the review! Arnd