drivers/gpu/drm/kmb/kmb_drv.c:102:31: sparse: sparse: incorrect type in return expression (different address spaces)

drivers/gpu/drm/kmb/kmb_drv.c:102:31: sparse: sparse: incorrect type in return expression (different address spaces)

[kernel test robot]

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Hi Stephen,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   debe436e77c72fcee804fb867f275e6d31aa999c
commit: ade896460e4a62f5e4a892a98d254937f6f5b64c drm: DRM_KMB_DISPLAY should depend on ARCH_KEEMBAY
date:   1 year ago
config: riscv-randconfig-s032-20211109 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
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: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ade896460e4a62f5e4a892a98d254937f6f5b64c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ade896460e4a62f5e4a892a98d254937f6f5b64c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/kmb/kmb_drv.c:102:31: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected void [noderef] __iomem * @@     got void * @@
   drivers/gpu/drm/kmb/kmb_drv.c:102:31: sparse:     expected void [noderef] __iomem *
   drivers/gpu/drm/kmb/kmb_drv.c:102:31: sparse:     got void *
--
>> drivers/gpu/drm/kmb/kmb_plane.c:21:11: sparse: sparse: symbol 'layer_irqs' was not declared. Should it be static?

vim +102 drivers/gpu/drm/kmb/kmb_drv.c

7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   90  }
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   91  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   92  static void __iomem *kmb_map_mmio(struct drm_device *drm,
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   93  				  struct platform_device *pdev,
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   94  				  char *name)
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   95  {
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   96  	struct resource *res;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   97  	void __iomem *mem;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   98  
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04   99  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  100  	if (!res) {
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  101  		drm_err(drm, "failed to get resource for %s", name);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04 @102  		return ERR_PTR(-ENOMEM);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  103  	}
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  104  	mem = devm_ioremap_resource(drm->dev, res);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  105  	if (IS_ERR(mem))
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  106  		drm_err(drm, "failed to ioremap %s registers", name);
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  107  	return mem;
7f7b96a8a0a185a Anitha Chrisanthus 2020-11-04  108  }

:::::: The code at line 102 was first introduced by commit
:::::: 7f7b96a8a0a185ad8b15ee1cf042f75aa1430c30 drm/kmb: Add support for KeemBay Display

:::::: TO: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
:::::: CC: Sam Ravnborg <sam@ravnborg.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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