linux-kernel - Re: [Linux-kernel-mentees] [Linux-kernel-mentee, PATCH] media: dvb_frontend.h: Fix shifting signed 32-bit value problem

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Message-ID: <20190705053037.GC8621@kroah.com>
Date:   Fri, 5 Jul 2019 07:30:37 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Luke Nowakowski-Krijger <lnowakow@....ucsd.edu>
Cc:     mchehab@...nel.org, linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [Linux-kernel-mentee, PATCH] media:
 dvb_frontend.h: Fix shifting signed 32-bit value problem

On Thu, Jul 04, 2019 at 10:04:22AM -0700, Luke Nowakowski-Krijger wrote:
> Fix DVBFE_ALGO_RECOVERY and DVBFE_ALGO_SEARCH_ERROR to use U cast which
> fixes undefined behavior error by certain compilers. 
> 
> Signed-off-by: Luke Nowakowski-Krijger <lnowakow@....ucsd.edu>
> ---
>  include/media/dvb_frontend.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/media/dvb_frontend.h b/include/media/dvb_frontend.h
> index f05cd7b94a2c..472fe5871d94 100644
> --- a/include/media/dvb_frontend.h
> +++ b/include/media/dvb_frontend.h
> @@ -144,7 +144,7 @@ enum dvbfe_algo {
>  	DVBFE_ALGO_HW			= (1 <<  0),
>  	DVBFE_ALGO_SW			= (1 <<  1),
>  	DVBFE_ALGO_CUSTOM		= (1 <<  2),
> -	DVBFE_ALGO_RECOVERY		= (1 << 31)
> +	DVBFE_ALGO_RECOVERY		= (1U << 31)

BIT() is better for stuff like this.

thanks,

greg k-h