linux-kernel - Re: drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:63: sparse: sparse: cast truncates bits from constant value (20000 becomes 0)

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Date:   Tue, 12 Jan 2021 16:03:17 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:63: sparse: sparse:
 cast truncates bits from constant value (20000 becomes 0)

On Tue, Jan 12, 2021 at 3:07 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   a0d54b4f5b219fb31f0776e9f53aa137e78ae431
> commit: 7b285f41f7376dc37e7fad1e803995fd39f42848 media: ipu3-cio2: Introduce CIO2_LOP_ENTRIES constant
> date:   4 months ago
> config: ia64-randconfig-s031-20210112 (attached as .config)
> compiler: ia64-linux-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # apt-get install sparse
>         # sparse version: v0.6.3-208-g46a52ca4-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b285f41f7376dc37e7fad1e803995fd39f42848
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 7b285f41f7376dc37e7fad1e803995fd39f42848
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=ia64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
>
> "sparse warnings: (new ones prefixed by >>)"
> >> drivers/media/pci/intel/ipu3/ipu3-cio2.c:163:63: sparse: sparse: cast truncates bits from constant value (20000 becomes 0)

Patch should be somewhere on its way to upstream.

-- 
With Best Regards,
Andy Shevchenko