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

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Date:   Thu, 4 Jul 2019 15:46:46 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Luke Nowakowski-Krijger <lnowakow@....ucsd.edu>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [Linux-kernel-mentee, PATCH] media: dvb_frontend.h: Fix shifting
 signed 32-bit value problem

Hi Luke,

On Thu, Jul 4, 2019 at 3:22 PM Luke Nowakowski-Krijger
<lnowakow@....ucsd.edu> 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)

You could switch all these definitions to use the BIT() macro instead.