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-rw-r--r--kernel/include/linux/swapfile.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/include/linux/swapfile.h b/kernel/include/linux/swapfile.h
new file mode 100644
index 000000000..388293a91
--- /dev/null
+++ b/kernel/include/linux/swapfile.h
@@ -0,0 +1,13 @@
+#ifndef _LINUX_SWAPFILE_H
+#define _LINUX_SWAPFILE_H
+
+/*
+ * these were static in swapfile.c but frontswap.c needs them and we don't
+ * want to expose them to the dozens of source files that include swap.h
+ */
+extern spinlock_t swap_lock;
+extern struct plist_head swap_active_head;
+extern struct swap_info_struct *swap_info[];
+extern int try_to_unuse(unsigned int, bool, unsigned long);
+
+#endif /* _LINUX_SWAPFILE_H */