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

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Date:   Fri, 20 Apr 2018 12:24:32 -0700
From:   Joe Perches <joe@...ches.com>
To:     yuankuiz@...eaurora.org, Thomas Gleixner <tglx@...utronix.de>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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, akpm@...ux-foundation.org
Subject: Re: [PATCH] time: tick-sched: use bool for tick_stopped

On Fri, 2018-04-20 at 14:44 +0800, yuankuiz@...eaurora.org wrote:
> On 2018-04-20 09:47 AM, yuankuiz@...eaurora.org wrote:
[]
> > [ZJ] Further prototyping has been given based on gcc for both of
> > x86_64 and armv8-a,
> >      unsigned int and bool share the same 1 bytes without the
> > addtional storage for sure.
> >      Open this and welcome if any other difference behaviour could be 
> > captured.
> 
> [ZJ] Typo.. change 4 bytes above to 1 byte actually.

Not really.

unsigned int is 4 and bool is generally 1.
Alignment padding after a bool may exist.