[driver-core:kobject-const-2 78/78] arch/arm/mm/dma-mapping.c:1713:47: warning: passing argument 1 of 'arm_iommu_create_mapping' discards 'const' qualifier from pointer target type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git kobject-const-2
head:   0be8abebbd476395ee73f4a83d4988dc9958f83c
commit: 0be8abebbd476395ee73f4a83d4988dc9958f83c [78/78] driver core: mark struct device's bus_type as const.
config: arm-randconfig-r046-20230209 (https://download.01.org/0day-ci/archive/20230210/[email protected]/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?id=0be8abebbd476395ee73f4a83d4988dc9958f83c
        git remote add driver-core https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
        git fetch --no-tags driver-core kobject-const-2
        git checkout 0be8abebbd476395ee73f4a83d4988dc9958f83c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

   arch/arm/mm/dma-mapping.c: In function 'arm_setup_iommu_dma_ops':
>> arch/arm/mm/dma-mapping.c:1713:47: warning: passing argument 1 of 'arm_iommu_create_mapping' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    1713 |         mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
         |                                            ~~~^~~~~
   arch/arm/mm/dma-mapping.c:1543:43: note: expected 'struct bus_type *' but argument is of type 'const struct bus_type *'
    1543 | arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size)
         |                          ~~~~~~~~~~~~~~~~~^~~


vim +1713 arch/arm/mm/dma-mapping.c

6fe367580339a3a Hiroshi Doyu      2013-01-24  1707  
ae626eb97376148 Christoph Hellwig 2022-04-19  1708  static void arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
ae626eb97376148 Christoph Hellwig 2022-04-19  1709  				    const struct iommu_ops *iommu, bool coherent)
4bb25789ed28228 Will Deacon       2014-08-27  1710  {
4bb25789ed28228 Will Deacon       2014-08-27  1711  	struct dma_iommu_mapping *mapping;
4bb25789ed28228 Will Deacon       2014-08-27  1712  
4bb25789ed28228 Will Deacon       2014-08-27 @1713  	mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
4bb25789ed28228 Will Deacon       2014-08-27  1714  	if (IS_ERR(mapping)) {
4bb25789ed28228 Will Deacon       2014-08-27  1715  		pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
4bb25789ed28228 Will Deacon       2014-08-27  1716  				size, dev_name(dev));
ae626eb97376148 Christoph Hellwig 2022-04-19  1717  		return;
4bb25789ed28228 Will Deacon       2014-08-27  1718  	}
4bb25789ed28228 Will Deacon       2014-08-27  1719  
eab8d6530cc0074 Laurent Pinchart  2015-01-23  1720  	if (__arm_iommu_attach_device(dev, mapping)) {
4bb25789ed28228 Will Deacon       2014-08-27  1721  		pr_warn("Failed to attached device %s to IOMMU_mapping\n",
4bb25789ed28228 Will Deacon       2014-08-27  1722  				dev_name(dev));
4bb25789ed28228 Will Deacon       2014-08-27  1723  		arm_iommu_release_mapping(mapping);
ae626eb97376148 Christoph Hellwig 2022-04-19  1724  		return;
4bb25789ed28228 Will Deacon       2014-08-27  1725  	}
4bb25789ed28228 Will Deacon       2014-08-27  1726  
ae626eb97376148 Christoph Hellwig 2022-04-19  1727  	set_dma_ops(dev, &iommu_ops);
4bb25789ed28228 Will Deacon       2014-08-27  1728  }
4bb25789ed28228 Will Deacon       2014-08-27  1729  

:::::: The code at line 1713 was first introduced by commit
:::::: 4bb25789ed28228a52c030bf28edb2fcdb214be8 arm: dma-mapping: plumb our iommu mapping ops into arch_setup_dma_ops

:::::: TO: Will Deacon <[email protected]>
:::::: CC: Will Deacon <[email protected]>

-- 
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