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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,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 DFC62C4360C for ; Tue, 8 Oct 2019 14:17:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA6CD2070B for ; Tue, 8 Oct 2019 14:17:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="q7aOEk8j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726631AbfJHORC (ORCPT ); Tue, 8 Oct 2019 10:17:02 -0400 Received: from merlin.infradead.org ([205.233.59.134]:41298 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725795AbfJHORB (ORCPT ); Tue, 8 Oct 2019 10:17:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=l9Gyq38LaeYddeGuisMrwC7W1W2X2MQMdHRXsX7Odc8=; b=q7aOEk8jQ0RZ6MkcvlqcPH4v7 kStA71izKvQ0vm0IUzZHhToJREX+IWGHtXbBkBmWzkbyCAm9pCUjZbR6kLYP1KTC7nvxBLkKUb17z dbtcLo96Hwfbjv672rvY/Brk8w9ZvvkRCB2BvvY1RbXWL840q3yzwexcWRk9bRpzBIoLFY9FX6d+0 evXDuD9rBV/p4Vgr4rHw6JRUHwDNuuHjhdrZlyqWa+sQXx5MtoXSDwuKHZ7Qsu9cRt28HBuP27nun 1jYa1VDKrmqS1eOcFAqPSDOtUzVzTt2DGzN5zsncKhkJji2uliDdtsPpt2Y2ZCWx9iooaEIafZO2B 7z/6W7Qeg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iHqI8-0001Qx-Fd; Tue, 08 Oct 2019 14:16:45 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 7A106305EE1; Tue, 8 Oct 2019 16:15:51 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D8182202801A0; Tue, 8 Oct 2019 16:16:42 +0200 (CEST) Date: Tue, 8 Oct 2019 16:16:42 +0200 From: Peter Zijlstra To: Valentin Schneider Cc: Vincent Guittot , linux-kernel , Ingo Molnar , Phil Auld , Srikar Dronamraju , Quentin Perret , Dietmar Eggemann , Morten Rasmussen , Hillf Danton Subject: Re: [PATCH v3 04/10] sched/fair: rework load_balance Message-ID: <20191008141642.GQ2294@hirez.programming.kicks-ass.net> References: <1568878421-12301-1-git-send-email-vincent.guittot@linaro.org> <1568878421-12301-5-git-send-email-vincent.guittot@linaro.org> <31cac0c1-98e4-c70e-e156-51a70813beff@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <31cac0c1-98e4-c70e-e156-51a70813beff@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 02, 2019 at 11:47:59AM +0100, Valentin Schneider wrote: > Yeah, right shift on signed negative values are implementation defined. Seriously? Even under -fno-strict-overflow? There is a perfectly sensible operation for signed shift right, this stuff should not be undefined.