mm: Make large folios depend on THP

Some parts of the VM still depend on THP to handle large folios correctly. Until those are fixed, prevent creating large folios if THP are disabled. Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
deepin-community · Mar 21, 2022 · 421f1ab · 421f1ab
1 parent 06d4414
commit 421f1ab
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
@@ -306,9 +306,14 @@ static inline void mapping_set_large_folios(struct address_space *mapping)
 	__set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
 }
 
+/*
+ * Large folio support currently depends on THP.  These dependencies are
+ * being worked on but are not yet fixed.
+ */
 static inline bool mapping_large_folio_support(struct address_space *mapping)
 {
-	return test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
+	return IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
+		test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
 }
 
 static inline int filemap_nr_thps(struct address_space *mapping)