linux-kernel - Re: [PATCH] platform/x86: acer-wmi: use true and false for boolean values

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Message-ID: <fa7980ee38e6cbb31883e1b942fa1e1d6f0e72b0.camel@perches.com>
Date:   Mon, 06 Aug 2018 09:42:56 -0700
From:   Joe Perches <joe@...ches.com>
To:     David Laight <David.Laight@...LAB.COM>,
        'Andy Shevchenko' <andy.shevchenko@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     "Lee, Chun-Yi" <jlee@...e.com>, Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: acer-wmi: use true and false for boolean
 values

On Mon, 2018-08-06 at 16:41 +0000, David Laight wrote:
> From: Andy Shevchenko
> > Sent: 05 August 2018 11:26
> > 
> > On Sun, Aug 5, 2018 at 3:18 AM, Gustavo A. R. Silva
> > <gustavo@...eddedor.com> wrote:
> > > Return statements in functions returning bool should use true or false
> > > instead of an integer value.
> > > 
> > > This code was detected with the help of Coccinelle.
> > >  static bool has_cap(u32 cap)
> > >  {
> > >         if ((interface->capability & cap) != 0)
> > > -               return 1;
> > > +               return true;
> > > 
> > > -       return 0;
> > > +       return false;
> > >  }
> > 
> > this entire function can be oneliner:
> > 
> > return !!(...);
> 
> Why the !! ?? Just:
> 	return (interface->capability & cap) != 0;

Because the return is bool you don't need the !! either.
The compiler does that.