tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2f5065a0bc9d0afb45f2ae284bd525d55ce82c33
commit: c44f15c1c09481d50fd33478ebb5b8284f8f5edb arc: iounmap() arg is volatile
date:   3 weeks ago
config: arc-randconfig-s033-20221106
compiler: arceb-elf-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c44f15c1c09481d50fd33478ebb5b8284f8f5edb
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c44f15c1c09481d50fd33478ebb5b8284f8f5edb
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash drivers/video/fbdev/

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

sparse warnings: (new ones prefixed by >>)
   drivers/video/fbdev/imsttfb.c:1519:30: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/video/fbdev/imsttfb.c:1519:27: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected char [noderef] __iomem *screen_base @@     got unsigned char [usertype] * @@
   drivers/video/fbdev/imsttfb.c:1519:27: sparse:     expected char [noderef] __iomem *screen_base
   drivers/video/fbdev/imsttfb.c:1519:27: sparse:     got unsigned char [usertype] *
   drivers/video/fbdev/imsttfb.c:1528:27: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/video/fbdev/imsttfb.c:1554:20: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned char [usertype] *cmap_regs @@
   drivers/video/fbdev/imsttfb.c:1554:20: sparse:     expected void const volatile [noderef] __iomem *addr
   drivers/video/fbdev/imsttfb.c:1554:20: sparse:     got unsigned char [usertype] *cmap_regs
   drivers/video/fbdev/imsttfb.c:1361:15: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/video/fbdev/imsttfb.c:1362:16: sparse: sparse: cast removes address space '__iomem' of expression

vim +1554 drivers/video/fbdev/imsttfb.c

^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1546  
48c68c4f1b5424 drivers/video/imsttfb.c Greg Kroah-Hartman 2012-12-21  1547  static void imsttfb_remove(struct pci_dev *pdev)
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1548  {
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1549  	struct fb_info *info = pci_get_drvdata(pdev);
94f9e09ce531d4 drivers/video/imsttfb.c Antonino A. Daplas 2006-01-09  1550  	struct imstt_par *par = info->par;
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1551  	int size = pci_resource_len(pdev, 0);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1552  
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1553  	unregister_framebuffer(info);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16 @1554  	iounmap(par->cmap_regs);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1555  	iounmap(par->dc_regs);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1556  	iounmap(info->screen_base);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1557  	release_mem_region(info->fix.smem_start, size);
94f9e09ce531d4 drivers/video/imsttfb.c Antonino A. Daplas 2006-01-09  1558  	framebuffer_release(info);
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1559  }
^1da177e4c3f41 drivers/video/imsttfb.c Linus Torvalds     2005-04-16  1560  

:::::: The code at line 1554 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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