mm/rmap: inline folio_test_large_maybe_mapped_shared() into callers

To prevent the function from being used when CONFIG_MM_ID is disabled, we
intend to inline it into its few callers, which also would help maintain
the expected code placement.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lance Yang <[email protected]>
Suggested-by: David Hildenbrand <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Mingzhe Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ioworker0

include/linux/mm.h

@@ -2111,7 +2111,7 @@ static inline bool folio_maybe_mapped_shared(struct folio *folio)
 	 */
 	if (mapcount <= 1)
 		return false;
-	return folio_test_large_maybe_mapped_shared(folio);
+	return test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids);
 }
 
 #ifndef HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE

include/linux/page-flags.h

@@ -1230,10 +1230,6 @@ static inline int folio_has_private(const struct folio *folio)
 	return !!(folio->flags & PAGE_FLAGS_PRIVATE);
 }
 
-static inline bool folio_test_large_maybe_mapped_shared(const struct folio *folio)
-{
-	return test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids);
-}
 #undef PF_ANY
 #undef PF_HEAD
 #undef PF_NO_TAIL

include/linux/rmap.h

@@ -223,7 +223,7 @@ static inline void __folio_large_mapcount_sanity_checks(const struct folio *foli
 	VM_WARN_ON_ONCE(folio_mm_id(folio, 1) != MM_ID_DUMMY &&
 			folio->_mm_id_mapcount[1] < 0);
 	VM_WARN_ON_ONCE(!folio_mapped(folio) &&
-			folio_test_large_maybe_mapped_shared(folio));
+			test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids));
 }
 
 static __always_inline void folio_set_large_mapcount(struct folio *folio,

mm/memory.c

@@ -3768,7 +3768,7 @@ static bool __wp_can_reuse_large_anon_folio(struct folio *folio,
 	 * If all folio references are from mappings, and all mappings are in
 	 * the page tables of this MM, then this folio is exclusive to this MM.
 	 */
-	if (folio_test_large_maybe_mapped_shared(folio))
+	if (test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids))
 		return false;
 
 	VM_WARN_ON_ONCE(folio_test_ksm(folio));
@@ -3791,7 +3791,7 @@ static bool __wp_can_reuse_large_anon_folio(struct folio *folio,
 	folio_lock_large_mapcount(folio);
 	VM_WARN_ON_ONCE_FOLIO(folio_large_mapcount(folio) > folio_ref_count(folio), folio);
 
-	if (folio_test_large_maybe_mapped_shared(folio))
+	if (test_bit(FOLIO_MM_IDS_SHARED_BITNUM, &folio->_mm_ids))
 		goto unlock;
 	if (folio_large_mapcount(folio) != folio_ref_count(folio))
 		goto unlock;