Merge branch 'for-4.12/asus' into for-linus

1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/swap_slots.h b/include/linux/swap_slots.h
new file mode 100644
index 000000000000..6ef92d17633d
--- /dev/null
+++ b/include/linux/swap_slots.h
@@ -0,0 +1,30 @@
+#ifndef _LINUX_SWAP_SLOTS_H
+#define _LINUX_SWAP_SLOTS_H
+
+#include <linux/swap.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+
+#define SWAP_SLOTS_CACHE_SIZE			SWAP_BATCH
+#define THRESHOLD_ACTIVATE_SWAP_SLOTS_CACHE	(5*SWAP_SLOTS_CACHE_SIZE)
+#define THRESHOLD_DEACTIVATE_SWAP_SLOTS_CACHE	(2*SWAP_SLOTS_CACHE_SIZE)
+
+struct swap_slots_cache {
+	bool		lock_initialized;
+	struct mutex	alloc_lock; /* protects slots, nr, cur */
+	swp_entry_t	*slots;
+	int		nr;
+	int		cur;
+	spinlock_t	free_lock;  /* protects slots_ret, n_ret */
+	swp_entry_t	*slots_ret;
+	int		n_ret;
+};
+
+void disable_swap_slots_cache_lock(void);
+void reenable_swap_slots_cache_unlock(void);
+int enable_swap_slots_cache(void);
+int free_swap_slot(swp_entry_t entry);
+
+extern bool swap_slot_cache_enabled;
+
+#endif /* _LINUX_SWAP_SLOTS_H */