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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 66414C433E2 for ; Thu, 17 Sep 2020 16:13:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 10FD921D7F for ; Thu, 17 Sep 2020 16:13:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Cl6gMhyt"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="0G3x32gL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728317AbgIQQNT (ORCPT ); Thu, 17 Sep 2020 12:13:19 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:56256 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728030AbgIQPOj (ORCPT ); Thu, 17 Sep 2020 11:14:39 -0400 X-Greylist: delayed 2065 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Sep 2020 11:14:38 EDT Date: Thu, 17 Sep 2020 17:13:41 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1600355622; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7IQwO6UJxW20LMLUtLPlneWWJbc+jEBAaDIiu8rtDKk=; b=Cl6gMhytvYn69nfF+qjSG74YQ9i9krDUl5sORisQKH0JkQpqwV3gUA9IXdxHYSiWD5U56p Vrwt3t3zTXoRZ3ykeKBNdgsnh0NRSYxM1Jia7kWLQuyxs1/M6Q/qsQodt3Jkk2WXJ+Qlga Qz0x8DctK34ZkKFVkhksrJnKrm3Dd78Xockntlv5Ou7Vt9p8J0CXq9+8CoK6+WqET7a8Yq 8W0PyY4pjnAdsO1YsswtXz6c9VZaUHX6Rw2QBpznnT+u2HStvNznun7sAOD2uVOwfdIIH0 YqWzv5hzxhdcrQdX8z+s+NEhCtAKlojIMp5HGKVKUPZUS7VSkE0MilgelEt1cw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1600355622; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7IQwO6UJxW20LMLUtLPlneWWJbc+jEBAaDIiu8rtDKk=; b=0G3x32gLy6+xQXP8AVD3wKIpaIU/8d3f29Kq4vCvcicApCf43/RGoClDkb31rx86yve02j 5QjSUk6fAJf/OdCA== From: Sebastian Siewior To: peterz@infradead.org Cc: Thomas Gleixner , LKML , Qais Yousef , Scott Wood , Valentin Schneider , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Vincent Donnefort Subject: Re: [patch 09/10] sched/core: Add migrate_disable/enable() Message-ID: <20200917151341.2ilqamtnc6hperix@linutronix.de> References: <20200917094202.301694311@linutronix.de> <20200917101624.813835219@linutronix.de> <20200917142438.GH1362448@hirez.programming.kicks-ass.net> <20200917143850.25akkvr32ojtwohy@linutronix.de> <20200917144937.GI1362448@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200917144937.GI1362448@hirez.programming.kicks-ass.net> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-09-17 16:49:37 [+0200], peterz@infradead.org wrote: > I'm aware of the duct-tape :-) But I was under the impression that we > didn't want the duct-tape, and that there was lots of issues with the > FPU code, or was that another issue? Of course it would be better not to need the duct tape. Also symmetrical locking is what you want but clearly futex is one of a kind. I'm currently not aware of any issues in the FPU code in regard to this. A few weeks ago, I was looking for this kind of usage and only futex popped up. Sebastian