diff --git a/fs/Kconfig b/fs/Kconfig
index 455aa20..d4bf8ca 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -109,6 +109,7 @@
 
 config TMPFS
 	bool "Virtual memory file system support (former shm fs)"
+	depends on SHMEM
 	help
 	  Tmpfs is a file system which keeps all files in virtual memory.
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5409ece..5946e2f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -702,17 +702,8 @@
 
 extern void show_free_areas(void);
 
-#ifdef CONFIG_SHMEM
-extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
-#else
-static inline int shmem_lock(struct file *file, int lock,
-			    struct user_struct *user)
-{
-	return 0;
-}
-#endif
+int shmem_lock(struct file *file, int lock, struct user_struct *user);
 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
-
 int shmem_zero_setup(struct vm_area_struct *);
 
 #ifndef CONFIG_MMU
diff --git a/mm/shmem.c b/mm/shmem.c
index 25ba75d..b4b56fd 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2593,6 +2593,11 @@
 	return 0;
 }
 
+int shmem_lock(struct file *file, int lock, struct user_struct *user)
+{
+	return 0;
+}
+
 #define shmem_vm_ops				generic_file_vm_ops
 #define shmem_file_operations			ramfs_file_operations
 #define shmem_get_inode(sb, mode, dev, flags)	ramfs_get_inode(sb, mode, dev)