linux-kernel - Re: [PATCH v3 04/10] sched/fair: rework load

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Message-ID: <20191008141642.GQ2294@hirez.programming.kicks-ass.net>
Date:   Tue, 8 Oct 2019 16:16:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Phil Auld <pauld@...hat.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Hillf Danton <hdanton@...a.com>
Subject: Re: [PATCH v3 04/10] sched/fair: rework load_balance

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.