linux-kernel - drivers/vfio/vfio_iommu_type1.c:2147:35: warning: cast to smaller integer type 'enum iommu

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Date:   Wed, 10 Aug 2022 11:25:15 +0800
From:   kernel test robot <lkp@...el.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: drivers/vfio/vfio_iommu_type1.c:2147:35: warning: cast to smaller
 integer type 'enum iommu_cap' from 'void *'

Hi Robin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d4252071b97d2027d246f6a82cbee4d52f618b47
commit: eed20c782aea57b7efb42af2905dc381268b21e9 vfio/type1: Simplify bus_type determination
date:   6 weeks ago
config: arm64-randconfig-r034-20220810 (https://download.01.org/0day-ci/archive/20220810/202208101119.7unZx9dJ-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eed20c782aea57b7efb42af2905dc381268b21e9
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout eed20c782aea57b7efb42af2905dc381268b21e9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/vfio/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/vfio/vfio_iommu_type1.c:2147:35: warning: cast to smaller integer type 'enum iommu_cap' from 'void *' [-Wvoid-pointer-to-enum-cast]
           return device_iommu_capable(dev, (enum iommu_cap)data);
                                            ^~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +2147 drivers/vfio/vfio_iommu_type1.c

  2143	
  2144	/* Redundantly walks non-present capabilities to simplify caller */
  2145	static int vfio_iommu_device_capable(struct device *dev, void *data)
  2146	{
> 2147		return device_iommu_capable(dev, (enum iommu_cap)data);
  2148	}
  2149	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp