linux-kernel - Re: [PATCH] media: staging: tegra-vde: print long unsigned using %lu format specifier

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Message-ID: <0b3bf728-7b7e-7250-40eb-0827f8fe955b@xs4all.nl>
Date:   Fri, 9 Nov 2018 15:32:37 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Colin King <colin.king@...onical.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: staging: tegra-vde: print long unsigned using %lu
 format specifier

On 11/08/18 12:02, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The frame.flags & FLAG_B_FRAME is promoted to a long unsigned because
> of the use of the BIT() macro when defining FLAG_B_FRAME and causing a
> build warning. Fix this by using the %lu format specifer.
> 
> Cleans up warning:
> drivers/staging/media/tegra-vde/tegra-vde.c:267:5: warning: format
> specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/staging/media/tegra-vde/tegra-vde.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/tegra-vde/tegra-vde.c b/drivers/staging/media/tegra-vde/tegra-vde.c
> index 6f06061a40d9..66cf14212c14 100644
> --- a/drivers/staging/media/tegra-vde/tegra-vde.c
> +++ b/drivers/staging/media/tegra-vde/tegra-vde.c
> @@ -262,7 +262,7 @@ static void tegra_vde_setup_iram_tables(struct tegra_vde *vde,
>  			value |= frame->frame_num;
>  
>  			dev_dbg(vde->miscdev.parent,
> -				"\tFrame %d: frame_num = %d B_frame = %d\n",
> +				"\tFrame %d: frame_num = %d B_frame = %lu\n",
>  				i + 1, frame->frame_num,
>  				(frame->flags & FLAG_B_FRAME));
>  		} else {
> 

Compiling for i686 gives:

In file included from /home/hans/work/build/media-git/include/linux/printk.h:336,
                 from /home/hans/work/build/media-git/include/linux/kernel.h:14,
                 from /home/hans/work/build/media-git/include/linux/clk.h:16,
                 from /home/hans/work/build/media-git/drivers/staging/media/tegra-vde/tegra-vde.c:12:
/home/hans/work/build/media-git/drivers/staging/media/tegra-vde/tegra-vde.c: In function 'tegra_vde_setup_iram_tables':
/home/hans/work/build/media-git/drivers/staging/media/tegra-vde/tegra-vde.c:265:5: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'u32' {aka 'unsigned int'} [-Wformat=]
     "\tFrame %d: frame_num = %d B_frame = %lu\n",
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hans/work/build/media-git/include/linux/dynamic_debug.h:135:39: note: in definition of macro 'dynamic_dev_dbg'
   __dynamic_dev_dbg(&descriptor, dev, fmt, \
                                       ^~~
/home/hans/work/build/media-git/include/linux/device.h:1463:23: note: in expansion of macro 'dev_fmt'
  dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
                       ^~~~~~~
/home/hans/work/build/media-git/drivers/staging/media/tegra-vde/tegra-vde.c:264:4: note: in expansion of macro 'dev_dbg'
    dev_dbg(vde->miscdev.parent,
    ^~~~~~~

Should it be %zu?

Regards,

	Hans