1 files changed, 53 insertions, 0 deletions
diff --git a/mm/shuffle.h b/mm/shuffle.h
new file mode 100644
index 000000000..a6bdf54f9
--- /dev/null
+++ b/mm/shuffle.h
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright(c) 2018 Intel Corporation. All rights reserved.
+#ifndef _MM_SHUFFLE_H
+#define _MM_SHUFFLE_H
+#include <linux/jump_label.h>
+
+#define SHUFFLE_ORDER MAX_ORDER
+
+#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
+DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
+extern void __shuffle_free_memory(pg_data_t *pgdat);
+extern bool shuffle_pick_tail(void);
+static inline void __meminit shuffle_free_memory(pg_data_t *pgdat)
+{
+	if (!static_branch_unlikely(&page_alloc_shuffle_key))
+		return;
+	__shuffle_free_memory(pgdat);
+}
+
+extern void __shuffle_zone(struct zone *z);
+static inline void __meminit shuffle_zone(struct zone *z)
+{
+	if (!static_branch_unlikely(&page_alloc_shuffle_key))
+		return;
+	__shuffle_zone(z);
+}
+
+static inline bool is_shuffle_order(int order)
+{
+	if (!static_branch_unlikely(&page_alloc_shuffle_key))
+		return false;
+	return order >= SHUFFLE_ORDER;
+}
+#else
+static inline bool shuffle_pick_tail(void)
+{
+	return false;
+}
+
+static inline void shuffle_free_memory(pg_data_t *pgdat)
+{
+}
+
+static inline void shuffle_zone(struct zone *z)
+{
+}
+
+static inline bool is_shuffle_order(int order)
+{
+	return false;
+}
+#endif
+#endif /* _MM_SHUFFLE_H */