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[2620:137:e000::3:5]) by mx.google.com with ESMTPS id br14-20020a056a00440e00b0068e4debbe12si9728802pfb.371.2023.09.19.08.34.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Sep 2023 08:34:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) client-ip=2620:137:e000::3:5; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by groat.vger.email (Postfix) with ESMTP id 5AF048076E4A; Tue, 19 Sep 2023 08:30:50 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232469AbjISPar (ORCPT + 99 others); Tue, 19 Sep 2023 11:30:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232459AbjISPaq (ORCPT ); Tue, 19 Sep 2023 11:30:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 324AAB0; Tue, 19 Sep 2023 08:30:40 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A377C433CA; Tue, 19 Sep 2023 15:30:35 +0000 (UTC) Date: Tue, 19 Sep 2023 11:31:08 -0400 From: Steven Rostedt To: Matthew Wilcox Cc: John Paul Adrian Glaubitz , Peter Zijlstra , Thomas Gleixner , Linus Torvalds , Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org Subject: Re: Arches that don't support PREEMPT Message-ID: <20230919113108.1c988906@gandalf.local.home> In-Reply-To: References: <20230912082606.GB35261@noisy.programming.kicks-ass.net> <87cyyfxd4k.ffs@tglx> <87led2wdj0.ffs@tglx> <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> <20230919134218.GA39281@noisy.programming.kicks-ass.net> <20230919141627.GB39281@noisy.programming.kicks-ass.net> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Tue, 19 Sep 2023 08:30:50 -0700 (PDT) On Tue, 19 Sep 2023 15:32:05 +0100 Matthew Wilcox wrote: > On Tue, Sep 19, 2023 at 04:24:48PM +0200, John Paul Adrian Glaubitz wrote: > > If the conversion isn't hard, why is the first reflex the urge to remove an architecture > > instead of offering advise how to get the conversion done? > > Because PREEMPT has been around since before 2005 (cc19ca86a023 created > Kconfig.preempt and I don't need to go back further than that to make my > point), and you haven't done the work yet. Clearly it takes the threat > of removal to get some kind of motion. Or the use case of a preempt kernel on said arch has never been a request. Just because it was available doesn't necessarily mean it's required. Please, let's not jump to threats of removal just to get a feature in. Simply ask first. I didn't see anyone reaching out to the maintainers asking for this as it will be needed for a new feature that will likely make maintaining said arch easier. Everything is still in brainstorming mode. -- Steve