[jingqi:per-page-tracking 1/1] mm/page_hotness.c:125:24: error: invalid operands to binary - (have 'long int *' and 'long unsigned int *')

[jingqi:per-page-tracking 1/1] mm/page_hotness.c:125:24: error: invalid operands to binary - (have 'long int *' and 'long unsigned int *')

[kbuild test robot]

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tree:   jingqi/per-page-tracking
head:   e7dc349d5c96c8c328597d42987309c2d5551bf1
commit: e7dc349d5c96c8c328597d42987309c2d5551bf1 [1/1] tmp fix for page_access_histogram
config: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-1) 7.5.0
reproduce:
        git checkout e7dc349d5c96c8c328597d42987309c2d5551bf1
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   mm/page_hotness.c: In function 'histogram_show':
>> mm/page_hotness.c:125:24: error: invalid operands to binary - (have 'long int *' and 'long unsigned int *')
     unsigned long off = l - (unsigned long *)h->private;
                           ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +125 mm/page_hotness.c

55b32bffd57af0 Zhibin Li 2019-11-27  121  
55b32bffd57af0 Zhibin Li 2019-11-27  122  static int histogram_show(struct seq_file *h, void *arg)
55b32bffd57af0 Zhibin Li 2019-11-27  123  {
e7dc349d5c96c8 Zhibin Li 2019-12-11  124  	long *l = arg;
55b32bffd57af0 Zhibin Li 2019-11-27 @125  	unsigned long off = l - (unsigned long *)h->private;
55b32bffd57af0 Zhibin Li 2019-11-27  126  
e7dc349d5c96c8 Zhibin Li 2019-12-11  127  	seq_printf(h, "%lu\t%ld\n", off, *l);
55b32bffd57af0 Zhibin Li 2019-11-27  128  	return 0;
55b32bffd57af0 Zhibin Li 2019-11-27  129  }
55b32bffd57af0 Zhibin Li 2019-11-27  130  

:::::: The code at line 125 was first introduced by commit
:::::: 55b32bffd57af03c9b199a95a43602eb5cc9b485 mm/page_hotness: provide procfs interface to check histogram

:::::: TO: Zhibin Li <zhibin.li@intel.com>
:::::: CC: Zhibin Li <zhibin.li@intel.com>

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org Intel Corporation

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