[davidhildenbrand:large_mapcount 24/27] fs/proc/page.c:73:23: error: use of undeclared identifier 'page'; did you mean 'ppage'?

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

tree:   https://github.com/davidhildenbrand/linux large_mapcount
head:   7e8a03fbcd6b8b5a7e2b6ea60f620c5d816cb44b
commit: efed85936fb7a152c58898dce59efa55105f78f9 [24/27] fs/proc/page: expose folio_mapcount() instead of page_mapcount()
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240406/202404060712.jTR2otML-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240406/202404060712.jTR2otML-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404060712.jTR2otML-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/proc/page.c:73:23: error: use of undeclared identifier 'page'; did you mean 'ppage'?
                           folio = page_folio(page);
                                              ^~~~
                                              ppage
   include/linux/page-flags.h:267:35: note: expanded from macro 'page_folio'
   #define page_folio(p)           (_Generic((p),                          \
                                              ^
   fs/proc/page.c:51:15: note: 'ppage' declared here
           struct page *ppage;
                        ^
>> fs/proc/page.c:73:23: error: use of undeclared identifier 'page'; did you mean 'ppage'?
                           folio = page_folio(page);
                                              ^~~~
                                              ppage
   include/linux/page-flags.h:268:60: note: expanded from macro 'page_folio'
           const struct page *:    (const struct folio *)_compound_head(p), \
                                                                        ^
   fs/proc/page.c:51:15: note: 'ppage' declared here
           struct page *ppage;
                        ^
>> fs/proc/page.c:73:23: error: use of undeclared identifier 'page'; did you mean 'ppage'?
                           folio = page_folio(page);
                                              ^~~~
                                              ppage
   include/linux/page-flags.h:269:49: note: expanded from macro 'page_folio'
           struct page *:          (struct folio *)_compound_head(p)))
                                                                  ^
   fs/proc/page.c:51:15: note: 'ppage' declared here
           struct page *ppage;
                        ^
>> fs/proc/page.c:74:28: error: use of undeclared identifier 'dolio'; did you mean 'folio'?
                           pcount = folio_mapcount(dolio);
                                                   ^~~~~
                                                   folio
   fs/proc/page.c:50:16: note: 'folio' declared here
           struct folio *folio;
                         ^
   4 errors generated.


vim +73 fs/proc/page.c

    39	
    40	/* /proc/kpagecount - an array exposing page counts
    41	 *
    42	 * Each entry is a u64 representing the corresponding
    43	 * physical page count.
    44	 */
    45	static ssize_t kpagecount_read(struct file *file, char __user *buf,
    46				     size_t count, loff_t *ppos)
    47	{
    48		const unsigned long max_dump_pfn = get_max_dump_pfn();
    49		u64 __user *out = (u64 __user *)buf;
    50		struct folio *folio;
    51		struct page *ppage;
    52		unsigned long src = *ppos;
    53		unsigned long pfn;
    54		ssize_t ret = 0;
    55		u64 pcount;
    56	
    57		pfn = src / KPMSIZE;
    58		if (src & KPMMASK || count & KPMMASK)
    59			return -EINVAL;
    60		if (src >= max_dump_pfn * KPMSIZE)
    61			return 0;
    62		count = min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src);
    63	
    64		while (count > 0) {
    65			/*
    66			 * TODO: ZONE_DEVICE support requires to identify
    67			 * memmaps that were actually initialized.
    68			 */
    69			ppage = pfn_to_online_page(pfn);
    70	
    71			pcount = 0;
    72			if (ppage) {
  > 73				folio = page_folio(page);
  > 74				pcount = folio_mapcount(dolio);
    75			}
    76	
    77			if (put_user(pcount, out)) {
    78				ret = -EFAULT;
    79				break;
    80			}
    81	
    82			pfn++;
    83			out++;
    84			count -= KPMSIZE;
    85	
    86			cond_resched();
    87		}
    88	
    89		*ppos += (char __user *)out - buf;
    90		if (!ret)
    91			ret = (char __user *)out - buf;
    92		return ret;
    93	}
    94	

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