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=-2.6 required=3.0 tests=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 56DEFC54FCB for ; Wed, 22 Apr 2020 16:40:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 223D421569 for ; Wed, 22 Apr 2020 16:40:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587573632; bh=a2zbWjxgVMa4iTxFb1SLUG61ZNNgjj/Et8+PzaCsSe0=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=doaM05beJkj9Tr9w1IAvdm1GfxqJYNOsIyhw8KunBYlx0+C83cm+pvCF9iycfW5b7 EkvjRE8sH6cpxwprKDzqL+Flbko5qjrPrGHBh6cxXVgqlsByDHBYwiqvdUQek5D2nY YfgJHwuuiRiTla9xTUhEZ9VFuo2XntrD5qjbkcFo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726582AbgDVQkb (ORCPT ); Wed, 22 Apr 2020 12:40:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:46724 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726469AbgDVQka (ORCPT ); Wed, 22 Apr 2020 12:40:30 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 89AA42082E; Wed, 22 Apr 2020 16:40:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587573630; bh=a2zbWjxgVMa4iTxFb1SLUG61ZNNgjj/Et8+PzaCsSe0=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=qfaF0NviQu//KdrHWbbYtmKA8beHJ70ZQGHIYEquUvYd6hQkY6FTrk0iUh/mM3oeT 2PvLSWWBJvCrwI+DlnTiCqpmD54umubrpwVY4eCI3LwFwZhg5DnoTksCj5yrlNy+qg 5f7oybvXKD9SZxaHBXubWjY7cK3HgD/HXuGxJ1MU= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 6378C3520480; Wed, 22 Apr 2020 09:40:30 -0700 (PDT) Date: Wed, 22 Apr 2020 09:40:30 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: Peter Zijlstra , mingo@kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, qais.yousef@arm.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, airlied@redhat.com, alexander.deucher@amd.com, awalls@md.metrocast.net, axboe@kernel.dk, broonie@kernel.org, daniel.lezcano@linaro.org, gregkh@linuxfoundation.org, hannes@cmpxchg.org, herbert@gondor.apana.org.au, hverkuil@xs4all.nl, john.stultz@linaro.org, nico@fluxnic.net, rafael.j.wysocki@intel.com, rmk+kernel@arm.linux.org.uk, sudeep.holla@arm.com, ulf.hansson@linaro.org, wim@linux-watchdog.org Subject: Re: [PATCH 01/23] sched: Provide sched_set_fifo() Message-ID: <20200422164030.GA17661@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200422112719.826676174@infradead.org> <20200422112831.266499893@infradead.org> <20200422131138.GL17661@paulmck-ThinkPad-P72> <20200422132648.GJ20730@hirez.programming.kicks-ass.net> <20200422155006.GR17661@paulmck-ThinkPad-P72> <20200422123331.30b00018@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200422123331.30b00018@gandalf.local.home> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 22, 2020 at 12:33:31PM -0400, Steven Rostedt wrote: > On Wed, 22 Apr 2020 08:50:06 -0700 > "Paul E. McKenney" wrote: > > > Indeed, an extreme form of insanity would be required to try to make core > > RCU be a module. Not that such a form of insanity is a bad thing in and > > of itself, but it might best be directed towards less futile ventures. ;-) > > That's like making the core of mutexes a module. How would that ever work > (without becoming a microkernel). Someone somewhere has probably done it. Perhaps you really could make mutexes be a module within the Linux kernel using kpatch or similar. Sort of, anyway. Not saying it is not insane, mind you! ;-) Thanx, Paul