linux-kernel - Re: [PATCH] time: tick-sched: use bool for tick

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Date:   Tue, 10 Apr 2018 14:26:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     yuankuiz@...eaurora.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Len Brown <len.brown@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pm-owner@...r.kernel.org
Subject: Re: [PATCH] time: tick-sched: use bool for tick_stopped

On Tue, Apr 10, 2018 at 02:07:32PM +0200, Thomas Gleixner wrote:
> On Tue, 10 Apr 2018, Peter Zijlstra wrote:
> > Do you have any actual evidence for that? Is there a compiler stupid
> > enough to generate code to convert a bool to a 1bit value?
> 
> Sure, if you do:
> 
> > > > > > > +       bool                            tick_stopped    : 1;
> 
> which is stupidly allowed by the standard....

The code-gen changes are because of the layout change, not because of
the type change.