linux-kernel - Re: [PATCH] can: m_can: fix boolreturn.cocci warnings

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Message-ID: <20191015071311.yssgqhoax46lfa7l@netronome.com>
Date:   Tue, 15 Oct 2019 09:13:12 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Jeroen Hofstee <jhofstee@...tronenergy.com>
Cc:     kbuild test robot <lkp@...el.com>,
        Pankaj Sharma <pankj.sharma@...sung.com>,
        "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wg@...ndegger.com" <wg@...ndegger.com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "eugen.hristev@...rochip.com" <eugen.hristev@...rochip.com>,
        "ludovic.desroches@...rochip.com" <ludovic.desroches@...rochip.com>,
        "pankaj.dubey@...sung.com" <pankaj.dubey@...sung.com>,
        "rcsekar@...sung.com" <rcsekar@...sung.com>,
        Sriram Dash <sriram.dash@...sung.com>
Subject: Re: [PATCH] can: m_can: fix boolreturn.cocci warnings

On Tue, Oct 15, 2019 at 06:37:54AM +0000, Jeroen Hofstee wrote:
> Hi,
> 
> On 10/15/19 7:57 AM, Simon Horman wrote:
> > On Mon, Oct 14, 2019 at 11:04:28PM +0800, kbuild test robot wrote:
> >> From: kbuild test robot <lkp@...el.com>
> >>
> >> drivers/net/can/m_can/m_can.c:783:9-10: WARNING: return of 0/1 in function 'is_protocol_err' with return type bool
> >>
> >>   Return statements in functions returning bool should use
> >>   true/false instead of 1/0.
> >> Generated by: scripts/coccinelle/misc/boolreturn.cocci
> >>
> >> Fixes: 46946163ac61 ("can: m_can: add support for handling arbitration error")
> >> CC: Pankaj Sharma <pankj.sharma@...sung.com>
> >> Signed-off-by: kbuild test robot <lkp@...el.com>
> >> ---
> >>
> >> url:    https://github.com/0day-ci/linux/commits/Pankaj-Sharma/can-m_can-add-support-for-handling-arbitration-error/20191014-193532
> >>
> >>   m_can.c |    4 ++--
> >>   1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> --- a/drivers/net/can/m_can/m_can.c
> >> +++ b/drivers/net/can/m_can/m_can.c
> >> @@ -780,9 +780,9 @@ static inline bool is_lec_err(u32 psr)
> >>   static inline bool is_protocol_err(u32 irqstatus)
> >>   {
> >>   	if (irqstatus & IR_ERR_LEC_31X)
> >> -		return 1;
> >> +		return true;
> >>   	else
> >> -		return 0;
> >> +		return false;
> >>   }
> >>   
> >>   static int m_can_handle_protocol_error(struct net_device *dev, u32 irqstatus)
> >>
> > <2c>
> > Perhaps the following is a nicer way to express this (completely untested):
> >
> > 	return !!(irqstatus & IR_ERR_LEC_31X);
> > </2c>
> 
> 
> Really...., !! for bool / _Bool types? why not simply:
> 
> static inline bool is_protocol_err(u32 irqstatus)
> 	return irqstatus & IR_ERR_LEC_31X;
> }

Good point, silly me.