On Mon, Oct 14, 2019 at 11:04:28PM +0800, kbuild test robot wrote:
> From: kbuild test robot <lkp@intel.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@samsung.com>
> Signed-off-by: kbuild test robot <lkp@intel.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>