From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 05A023314AC for ; Sat, 23 May 2026 10:02:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779530541; cv=none; b=KYLWX0EZTvcwUAQ6hPURcI8YpXKjzOellA9zkxDXerD8CKKUfybyK9v+K3kqzuQtvts7/DiUeiKJ17MWBwJ/Wr5bi3CI/st14is1ELH0y2DvAPnRcUCy8MaiSOmkCsY4+MC5E66IOfB87bvE+A519Gs0MPfwQqfcIdIasmHkDoU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779530541; c=relaxed/simple; bh=IZ31uBPXorwCJKzDhxNPnGXb+Xvwsmep8TRCXXsHIww=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Wc9+A2VThs3h0d0AIPZ950pP5sD6lNl0zfbntOG9mW4XWqvndJ40BL6avV4zcXRx9LUbk2U6N+D4pldjwdxuVXfIWwJq0i1FDaOu2Ho+vfNPTybHF7LNeWiDn6meADVpKzrv5Yjm7XyQGsWvXr19uGTMDUmPR15phrX/xN06gjI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=qxga//bO; arc=none smtp.client-ip=209.85.221.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qxga//bO" Received: by mail-wr1-f51.google.com with SMTP id ffacd0b85a97d-44ce78ab5feso6711299f8f.0 for ; Sat, 23 May 2026 03:02:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779530538; x=1780135338; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=1dyS+M/daJJ0p+CMZXykovqcqcs90fDCCGX+ejHCgHw=; b=qxga//bOYPRIJdgJ5w/6d5Dp5KPlRfz74ZOY+tHGS3Iz9dtcYEBAawLvN48Uo6ciGU +Cto1d33H2syX7lBHhlOm0ODX9Y7+CaGqMOulKu19n5Qb+dPO6Pt4P7rvFntnjoiCR4V HVqzL2mSJN4THrcqjBp9w7B2tuF+R4xsQ/pwnY5SZHqEFACyibcPBpUP+z+ThOR64s/7 gnOaqXeU4Myud245uuZCRjbNFfVCp7sQXHzerq8cp3Fo/j9rUeYyLdM/4GBatC9Zr/Sb dxeP1i/uyM7MKVEUirF3t3ivjwuE5lIKc1hfvKDUqS0OzscewAPUVHMPyeETpz8OZxQA Mmng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779530538; x=1780135338; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=1dyS+M/daJJ0p+CMZXykovqcqcs90fDCCGX+ejHCgHw=; b=Sa7H+APE7wmE2wQL34Kj6i1skZaFOIfW5B09sKUVjOLROGvC5EujmZYxgF4VJoTUa5 uWliuFNcTBukaw7pm+gEOWR63Xxc/kg2MAe3AI22zwNgWdKRsOf6AFTErQoR4yqFjDVn kJvED/A+Srtdmj9K4F6sdC1veDWaUGsYm0uN9T+AYkNJh1QWAZTZKwqjKHqhbLMs7O7h /py9MnmGlZNPPgM4+JsDw+G5NBxaFy1T6z3OYeiCd+tFkFauDEsX+em+JyFGTLpiuWjQ cju+KpRmnGy3ME7zxIhMWo1gCmFrfYs40shXTOA6hz14MW4OwMioJ4QA71X4JeNbcdIz UAWw== X-Forwarded-Encrypted: i=1; AFNElJ+YjD0WRleXo5L9k28yQkipADDMYkhhkvvDqvbjtAjw8HbpWSIZFVD2SArbaVpzyrU74YAQk2Iq49UciYU=@vger.kernel.org X-Gm-Message-State: AOJu0YyCynvyFY43JsT2nthetjyiORBxW9yzEF+j9p7QT66pTL4b7Eeb eZNGo3Cis9r3II26P2wjFSCPlu8N87whcQbEcTHfJQOav9DYhQKy3MNX X-Gm-Gg: Acq92OFuawhS/2S8y9DFeRST6Jg3N+A17x+pPP5lTojORirt5z5jCywBHpbmxcNL7XC n29tsWOiKF7YWaOcegTOdkFlsjTSzyNZriUj4aDVNhPi6Df9TjdgA+C9osg+pz74Y5Xb2HbztbC sXYCtBtZTg4NJ6c71f26wSWsOxqcEqdnu3GOlguE++8RW8vWU+rkeKN/bvcCt7pbsCPH+sk/DIT JDpld3ajCSP27exIdoTtCoW+SfEmwSDJwfDHNNZoT1gUmK1kRd8ef7KBi4gxyfx0RQ4uIvfK32Y lvhmrAdulH2hmGdMvnrYhJ/ghqiL7uMbCYD1iWv8Ah/Kdh15+u1WhyytL6HE5mJ24enIP+WOcMp p9ldC7ZE36UknynIsaNHMAuAvEDYq6yd7+MDWcws78uMhLRI2d2Q9kc6hXtdEXT4N47cNpJEPvn f674OuGQwJsQ2ZXMFnXgg5J/rNzP55PXA/sggycJD3T3k1bIGaWYP4ZU3X3RunuPi6JGihKIuAO 8OWLvB685sdSQ== X-Received: by 2002:a05:6000:4283:b0:43d:50c:6f33 with SMTP id ffacd0b85a97d-45eb38badbcmr11789586f8f.26.1779530538082; Sat, 23 May 2026 03:02:18 -0700 (PDT) Received: from pumpkin (82-69-66-36.dsl.in-addr.zen.co.uk. [82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6ccd211sm14335557f8f.10.2026.05.23.03.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2026 03:02:17 -0700 (PDT) Date: Sat, 23 May 2026 11:02:16 +0100 From: David Laight To: "Arnd Bergmann" Cc: "Arnd Bergmann" , "Ingo Molnar" , "Richard Weinberger" , "Anton Ivanov" , "Johannes Berg" , "Thomas Gleixner" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "Peter Zijlstra" , "Will Deacon" , "Boqun Feng" , "Gary Guo" , "Yury Norov" , "Rasmus Villemoes" , "Boris Ostrovsky" , "Alexander Usyskin" , "Anthony L Nguyen" , "Przemek Kitszel" , x86@kernel.org, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org Subject: Re: [PATCH 8/8] x86: simplify 32-bit instruction set selection Message-ID: <20260523110216.2724bf6b@pumpkin> In-Reply-To: <9789e44c-cad6-4fb9-b684-ed132347a92d@app.fastmail.com> References: <20260522141959.1071595-1-arnd@kernel.org> <20260522141959.1071595-9-arnd@kernel.org> <20260522223349.155dfe20@pumpkin> <9789e44c-cad6-4fb9-b684-ed132347a92d@app.fastmail.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) 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-Transfer-Encoding: 7bit On Sat, 23 May 2026 10:51:41 +0200 "Arnd Bergmann" wrote: > On Fri, May 22, 2026, at 23:33, David Laight wrote: ... > > But neither is really anything like even Sandy bridge. > > Sandy Bridge was well into the 64-bit era. Even when that was > new, you wouldn't have run a 32-bit kernel on it (or cared > about CPU optimizations if you did). For x86-64 there is no > CPU selection and we just always build with -mtune=generic. > This works well with any out-of-order microarchitecture. For some reason I was thinking the same mtune list would apply to 64bit (even though some would clearly be pointless). I probably got fooled by you saying that the other ten are aliases. -- David > > Arnd