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Message-ID: <8cc03625-f41d-6009-d50c-823e5f498dca@infradead.org>
Date: Wed, 5 Jun 2019 20:22:55 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Shuah Khan <skhan@...uxfoundation.org>, mchehab@...nel.org,
hverkuil-cisco@...all.nl, sakari.ailus@...ux.intel.com,
niklas.soderlund+renesas@...natech.se, ezequiel@...labora.com,
paul.kocialkowski@...tlin.com
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: v4l2-core: Shifting signed 32-bit value by 31
bits error
On 6/5/19 2:53 PM, Shuah Khan wrote:
> Fix the following cppcheck error:
>
> Checking drivers/media/v4l2-core/v4l2-ioctl.c ...
> [drivers/media/v4l2-core/v4l2-ioctl.c:1370]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour
>
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> ---
> drivers/media/v4l2-core/v4l2-ioctl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 6859bdac86fe..333e387bafeb 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1364,7 +1364,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> (char)((fmt->pixelformat >> 8) & 0x7f),
> (char)((fmt->pixelformat >> 16) & 0x7f),
> (char)((fmt->pixelformat >> 24) & 0x7f),
> - (fmt->pixelformat & (1 << 31)) ? "-BE" : "");
> + (fmt->pixelformat & BIT(31)) ? "-BE" : "");
> break;
> }
> }
>
If this builds, I guess #define BIT(x) got pulled in indirectly
since bits.h nor bitops.h is currently #included in that source file.
Documentation/process/submit-checklist.rst rule #1 says:
1) If you use a facility then #include the file that defines/declares
that facility. Don't depend on other header files pulling in ones
that you use.
Please add #include <linux/bits or bitops.h>
--
~Randy
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