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 X-Spam-Level: X-Spam-Status: No, score=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F26B2C433DB for ; Thu, 7 Jan 2021 15:33:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBD3123370 for ; Thu, 7 Jan 2021 15:33:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728361AbhAGPd0 (ORCPT ); Thu, 7 Jan 2021 10:33:26 -0500 Received: from mail.kernel.org ([198.145.29.99]:33898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726319AbhAGPdZ (ORCPT ); Thu, 7 Jan 2021 10:33:25 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 86F2C23405; Thu, 7 Jan 2021 15:32:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1610033564; bh=J2A8dkQ/NsxKAvM9Lqfg4UecX1/COeevtflgDIMOHY8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=a+wzvgqa8wzPiEk8G1t1Tp2ibB2qv2IUqNl/mc63eyMlHWpFJVs4ZqQpzco/s407u deTVFnbeO53I2GZT51Tn12GVf3hg6PaQQlwObwngxuoTWe099NsO9NTbesTuojUmFA gQdGa3AU2PenCHy2CzE2oRWgE6gAkSJRp8CSxuVOGIroa+XalA5UrOZNOxgoUnrUEK 0kyssDkOhRpyG+ZXv1kmcS1d/hfmwVD6bnYpOl9c1sWiIonQx8XSwGgRMmQ+UDXKOL soHC5rSjR7VSBp++PthSIwV4WIFymFHKoODsw2AOIEDRnRAmZGBUu5GRgqbe9tyYUJ n8lQLeF2xCIIA== Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 53BF73522589; Thu, 7 Jan 2021 07:32:44 -0800 (PST) Date: Thu, 7 Jan 2021 07:32:44 -0800 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Yury Norov , Linux Kernel Mailing List , kernel-team@fb.com, Paul Gortmaker Subject: Re: [PATCH RFC cpumask 4/5] cpumask: Add "last" alias for cpu list specifications Message-ID: <20210107153244.GL2743@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20210106004850.GA11682@paulmck-ThinkPad-P72> <20210106004956.11961-4-paulmck@kernel.org> <20210107144757.GK2743@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 07, 2021 at 03:59:42PM +0100, Peter Zijlstra wrote: > On Thu, Jan 07, 2021 at 06:47:57AM -0800, Paul E. McKenney wrote: > > > I don't really see the use of the ranges thing, CPU enumeration just > > > isn't sane like that. Also, I should really add that randomization pass > > > to the CPU enumeration :-) > > > > Please don't!!! > > Why not, the BIOS more or less already does that on a per machine basis > anyway. Doing it per boot just makes things more reliably screwy ;-) Fixing BIOS would be much more productive, now wouldn't it? Thanx, Paul