1 files changed, 47 insertions, 0 deletions
diff --git a/include/linux/swap_cgroup.h b/include/linux/swap_cgroup.h
new file mode 100644
index 000000000000..91cdf12190a0
--- /dev/null
+++ b/include/linux/swap_cgroup.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_SWAP_CGROUP_H
+#define __LINUX_SWAP_CGROUP_H
+
+#include <linux/swap.h>
+
+#if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP)
+
+extern void swap_cgroup_record(struct folio *folio, unsigned short id, swp_entry_t ent);
+extern unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents);
+extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
+extern int swap_cgroup_swapon(int type, unsigned long max_pages);
+extern void swap_cgroup_swapoff(int type);
+
+#else
+
+static inline
+void swap_cgroup_record(struct folio *folio, unsigned short id, swp_entry_t ent)
+{
+}
+
+static inline
+unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents)
+{
+	return 0;
+}
+
+static inline
+unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
+{
+	return 0;
+}
+
+static inline int
+swap_cgroup_swapon(int type, unsigned long max_pages)
+{
+	return 0;
+}
+
+static inline void swap_cgroup_swapoff(int type)
+{
+	return;
+}
+
+#endif
+
+#endif /* __LINUX_SWAP_CGROUP_H */