[arnd-playground:randconfig-5.17-next 133/205] drivers/video/fbdev/core/fb_device.c:88:17: sparse: sparse: incorrect type in argument 2 (different address spaces)

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git randconfig-5.17-next
head:   fdcc9acc26de65e7b1b8cebc3089b7666be25681
commit: f63b31214860be43eb1b2aa8052b066c6497484f [133/205] fbdev: move chrdev code into fb_device.c
config: s390-randconfig-s032-20211207 (https://download.01.org/0day-ci/archive/20211208/202112082006.su7StCAb-lkp(a)intel.com/config)
compiler: s390-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/arnd/playground.git/commit/?id=f63b31214860be43eb1b2aa8052b066c6497484f
        git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground randconfig-5.17-next
        git checkout f63b31214860be43eb1b2aa8052b066c6497484f
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash drivers/video/fbdev/core/

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/video/fbdev/core/fb_device.c:88:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const *src @@     got unsigned char [noderef] [usertype] __iomem *[assigned] src @@
   drivers/video/fbdev/core/fb_device.c:88:17: sparse:     expected void const *src
   drivers/video/fbdev/core/fb_device.c:88:17: sparse:     got unsigned char [noderef] [usertype] __iomem *[assigned] src
>> drivers/video/fbdev/core/fb_device.c:165:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *dest @@     got unsigned char [noderef] [usertype] __iomem *[assigned] dst @@
   drivers/video/fbdev/core/fb_device.c:165:17: sparse:     expected void *dest
   drivers/video/fbdev/core/fb_device.c:165:17: sparse:     got unsigned char [noderef] [usertype] __iomem *[assigned] dst

vim +88 drivers/video/fbdev/core/fb_device.c

    41	
    42	static ssize_t
    43	fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
    44	{
    45		unsigned long p = *ppos;
    46		struct fb_info *info = file_fb_info(file);
    47		u8 *buffer, *dst;
    48		u8 __iomem *src;
    49		int c, cnt = 0, err = 0;
    50		unsigned long total_size;
    51	
    52		if (!info || ! info->screen_base)
    53			return -ENODEV;
    54	
    55		if (info->state != FBINFO_STATE_RUNNING)
    56			return -EPERM;
    57	
    58		if (info->fbops->fb_read)
    59			return info->fbops->fb_read(info, buf, count, ppos);
    60	
    61		total_size = info->screen_size;
    62	
    63		if (total_size == 0)
    64			total_size = info->fix.smem_len;
    65	
    66		if (p >= total_size)
    67			return 0;
    68	
    69		if (count >= total_size)
    70			count = total_size;
    71	
    72		if (count + p > total_size)
    73			count = total_size - p;
    74	
    75		buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
    76				 GFP_KERNEL);
    77		if (!buffer)
    78			return -ENOMEM;
    79	
    80		src = (u8 __iomem *) (info->screen_base + p);
    81	
    82		if (info->fbops->fb_sync)
    83			info->fbops->fb_sync(info);
    84	
    85		while (count) {
    86			c  = (count > PAGE_SIZE) ? PAGE_SIZE : count;
    87			dst = buffer;
  > 88			fb_memcpy_fromfb(dst, src, c);
    89			dst += c;
    90			src += c;
    91	
    92			if (copy_to_user(buf, buffer, c)) {
    93				err = -EFAULT;
    94				break;
    95			}
    96			*ppos += c;
    97			buf += c;
    98			cnt += c;
    99			count -= c;
   100		}
   101	
   102		kfree(buffer);
   103	
   104		return (err) ? err : cnt;
   105	}
   106	
   107	static ssize_t
   108	fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
   109	{
   110		unsigned long p = *ppos;
   111		struct fb_info *info = file_fb_info(file);
   112		u8 *buffer, *src;
   113		u8 __iomem *dst;
   114		int c, cnt = 0, err = 0;
   115		unsigned long total_size;
   116	
   117		if (!info || !info->screen_base)
   118			return -ENODEV;
   119	
   120		if (info->state != FBINFO_STATE_RUNNING)
   121			return -EPERM;
   122	
   123		if (info->fbops->fb_write)
   124			return info->fbops->fb_write(info, buf, count, ppos);
   125	
   126		total_size = info->screen_size;
   127	
   128		if (total_size == 0)
   129			total_size = info->fix.smem_len;
   130	
   131		if (p > total_size)
   132			return -EFBIG;
   133	
   134		if (count > total_size) {
   135			err = -EFBIG;
   136			count = total_size;
   137		}
   138	
   139		if (count + p > total_size) {
   140			if (!err)
   141				err = -ENOSPC;
   142	
   143			count = total_size - p;
   144		}
   145	
   146		buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count,
   147				 GFP_KERNEL);
   148		if (!buffer)
   149			return -ENOMEM;
   150	
   151		dst = (u8 __iomem *) (info->screen_base + p);
   152	
   153		if (info->fbops->fb_sync)
   154			info->fbops->fb_sync(info);
   155	
   156		while (count) {
   157			c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
   158			src = buffer;
   159	
   160			if (copy_from_user(src, buf, c)) {
   161				err = -EFAULT;
   162				break;
   163			}
   164	
 > 165			fb_memcpy_tofb(dst, src, c);
   166			dst += c;
   167			src += c;
   168			*ppos += c;
   169			buf += c;
   170			cnt += c;
   171			count -= c;
   172		}
   173	
   174		kfree(buffer);
   175	
   176		return (cnt) ? cnt : err;
   177	}
   178	

---
0-DAY CI Kernel Test Service, Intel Corporation
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