linux-kernel - RE: sound/soc/intel/catpt/dsp.c:359:9: sparse: sparse: restricted pci_power

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Date:   Thu, 22 Oct 2020 14:33:18 +0000
From:   "Rojewski, Cezary" <cezary.rojewski@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     lkp <lkp@...el.com>,
        "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>
Subject: RE: sound/soc/intel/catpt/dsp.c:359:9: sparse: sparse: restricted
 pci_power_t degrades to integer

On 2020-10-22 4:09 PM, Bjorn Helgaas wrote:
> On Thu, Oct 22, 2020 at 04:52:29PM +0300, Andy Shevchenko wrote:
>> +Cc: Bjorn
>>
>> On Thu, Oct 22, 2020 at 03:25:49PM +0800, kernel test robot wrote:
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   f804b3159482eedbb4250b1e9248c308fb63b805
>>> commit: 6cbfa11d2694b8a1e46d6834fb9705d5589e3ef1 ASoC: Intel: Select catpt and deprecate haswell
>>> date:   3 weeks ago
>>> config: i386-randconfig-s002-20201022 (attached as .config)
>>> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
>>> reproduce:
>>>          # apt-get install sparse
>>>          # sparse version: v0.6.3-dirty
>>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6cbfa11d2694b8a1e46d6834fb9705d5589e3ef1
>>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>          git fetch --no-tags linus master
>>>          git checkout 6cbfa11d2694b8a1e46d6834fb9705d5589e3ef1
>>>          # save the attached .config to linux build tree
>>>          make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386
>>>
>>> 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 >>)"
>>>>> sound/soc/intel/catpt/dsp.c:359:9: sparse: sparse: restricted pci_power_t degrades to integer
>>>     sound/soc/intel/catpt/dsp.c:372:9: sparse: sparse: restricted pci_power_t degrades to integer
>>>     sound/soc/intel/catpt/dsp.c:423:9: sparse: sparse: restricted pci_power_t degrades to integer
>>>     sound/soc/intel/catpt/dsp.c:447:9: sparse: sparse: restricted pci_power_t degrades to integer
>>
>> I dunno who and why created that specific bitwise type. I met not the first
>> time the same Sparse complain.
> 
> Thanks for the cc.  Yeah, I hate that too.  It's one of the few
> remaining warnings in drivers/pci/.  It's my goal to eradicate it for
> v5.11.
> 

I've ignored that warning when upstreaming catpt ASoC driver as I
believe code is more readable when constants are not prepended with
explicit cast in this very case.

Should the warning be ignored (leave code as is) -or- do you want me to
prepend all PCI_Dx usages with explicit cast regardless of my initial
intentions?

Regards,
Czarek