[gourryinverse:scratch/gourry/cxl/compression/file_cleancache 87/98] mm/internal.h:2086:15: error: unknown type name 'rmap_t'

tree:   https://github.com/gourryinverse/linux scratch/gourry/cxl/compression/file_cleancache
head:   bcd0bfca5b64d6cbb5aadb07554b9bd218e0df85
commit: 6e2dd58311ea13f03bd4c1f38bd1d4d5818803ce [87/98] mm/migrate: re-install migrated write-fenced folios read-only
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20260710/[email protected]/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260710/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from mm/filemap.c:54:
>> mm/internal.h:2086:15: error: unknown type name 'rmap_t'
    2086 | static inline rmap_t migration_remap_rmap_flags(struct folio *folio,
         |               ^
>> mm/internal.h:2091:10: error: use of undeclared identifier 'RMAP_EXCLUSIVE'
    2091 |                 return RMAP_EXCLUSIVE;
         |                        ^
>> mm/internal.h:2092:9: error: use of undeclared identifier 'RMAP_NONE'; did you mean 'DMA_NONE'?
    2092 |         return RMAP_NONE;
         |                ^~~~~~~~~
         |                DMA_NONE
   include/linux/dma-direction.h:9:2: note: 'DMA_NONE' declared here
       9 |         DMA_NONE = 3,
         |         ^
   In file included from mm/filemap.c:54:
   mm/internal.h:2096:10: error: unknown type name 'rmap_t'
    2096 |                                             rmap_t rmap_flags)
         |                                             ^
   mm/internal.h:2105:50: error: use of undeclared identifier 'RMAP_EXCLUSIVE'
    2105 |         return !folio_test_anon(folio) || (rmap_flags & RMAP_EXCLUSIVE);
         |                                                         ^
   5 errors generated.


vim +/rmap_t +2086 mm/internal.h

  2073	
  2074	/*
  2075	 * Resolve rmap flags and writability for a folio being re-installed present
  2076	 * after migration.  Shared by remove_migration_pte() and remove_migration_pmd().
  2077	 *
  2078	 * Exclusivity is the single lever.  Anon writability requires exclusive
  2079	 * ownership.  A writable migration entry is only ever made for an exclusive anon
  2080	 * page; see make_writable_migration_entry() and the VM_WARN in
  2081	 * try_to_migrate_one().  A folio that must stay read-only, one on a write-fenced
  2082	 * node, is kept non-exclusive here, and writability falls out as false.  The
  2083	 * next write then COW-promotes it off-node.  This also makes the "writable anon
  2084	 * implies exclusive" invariant structural rather than a tripwire.
  2085	 */
> 2086	static inline rmap_t migration_remap_rmap_flags(struct folio *folio,
  2087							bool was_read)
  2088	{
  2089		if (folio_test_anon(folio) && !was_read &&
  2090		    !node_write_fenced(folio_nid(folio)))
> 2091			return RMAP_EXCLUSIVE;
> 2092		return RMAP_NONE;
  2093	}
  2094	

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