diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index 75de4ab..88a330d 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -5,3 +5,4 @@
 generic-y += trace_clock.h
 generic-y += preempt.h
 generic-y += hash.h
+generic-y += barrier.h
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index d89b02b..cbc5edd 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -25,10 +25,8 @@
 	void *fault_addr;
 	jmp_buf *fault_catcher;
 	struct task_struct *prev_sched;
-	unsigned long temp_stack;
 	struct arch_thread arch;
 	jmp_buf switch_buf;
-	int mm_count;
 	struct {
 		int op;
 		union {
@@ -52,7 +50,6 @@
 	.regs		   	= EMPTY_REGS,	\
 	.fault_addr		= NULL, \
 	.prev_sched		= NULL, \
-	.temp_stack		= 0, \
 	.arch			= INIT_ARCH_THREAD, \
 	.request		= { 0 } \
 }
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index db23ce1..fe649d3 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -186,7 +186,7 @@
 	return inode;
 }
 
-int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
+static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
 {
 	/*
 	 * do_statfs uses struct statfs64 internally, but the linux kernel
@@ -268,7 +268,7 @@
 	.show_options	= hostfs_show_options,
 };
 
-int hostfs_readdir(struct file *file, struct dir_context *ctx)
+static int hostfs_readdir(struct file *file, struct dir_context *ctx)
 {
 	void *dir;
 	char *name;
@@ -293,7 +293,7 @@
 	return 0;
 }
 
-int hostfs_file_open(struct inode *ino, struct file *file)
+static int hostfs_file_open(struct inode *ino, struct file *file)
 {
 	static DEFINE_MUTEX(open_mutex);
 	char *name;
@@ -359,7 +359,8 @@
 	return 0;
 }
 
-int hostfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+static int hostfs_fsync(struct file *file, loff_t start, loff_t end,
+			int datasync)
 {
 	struct inode *inode = file->f_mapping->host;
 	int ret;
@@ -394,7 +395,7 @@
 	.read		= generic_read_dir,
 };
 
-int hostfs_writepage(struct page *page, struct writeback_control *wbc)
+static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
 {
 	struct address_space *mapping = page->mapping;
 	struct inode *inode = mapping->host;
@@ -430,7 +431,7 @@
 	return err;
 }
 
-int hostfs_readpage(struct file *file, struct page *page)
+static int hostfs_readpage(struct file *file, struct page *page)
 {
 	char *buffer;
 	long long start;
@@ -455,9 +456,9 @@
 	return err;
 }
 
-int hostfs_write_begin(struct file *file, struct address_space *mapping,
-			loff_t pos, unsigned len, unsigned flags,
-			struct page **pagep, void **fsdata)
+static int hostfs_write_begin(struct file *file, struct address_space *mapping,
+			      loff_t pos, unsigned len, unsigned flags,
+			      struct page **pagep, void **fsdata)
 {
 	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 
@@ -467,9 +468,9 @@
 	return 0;
 }
 
-int hostfs_write_end(struct file *file, struct address_space *mapping,
-			loff_t pos, unsigned len, unsigned copied,
-			struct page *page, void *fsdata)
+static int hostfs_write_end(struct file *file, struct address_space *mapping,
+			    loff_t pos, unsigned len, unsigned copied,
+			    struct page *page, void *fsdata)
 {
 	struct inode *inode = mapping->host;
 	void *buffer;
@@ -549,8 +550,8 @@
 	return 0;
 }
 
-int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		  bool excl)
+static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+			 bool excl)
 {
 	struct inode *inode;
 	char *name;
@@ -591,8 +592,8 @@
 	return error;
 }
 
-struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
-			     unsigned int flags)
+static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
+				    unsigned int flags)
 {
 	struct inode *inode;
 	char *name;
@@ -628,7 +629,8 @@
 	return ERR_PTR(err);
 }
 
-int hostfs_link(struct dentry *to, struct inode *ino, struct dentry *from)
+static int hostfs_link(struct dentry *to, struct inode *ino,
+		       struct dentry *from)
 {
 	char *from_name, *to_name;
 	int err;
@@ -646,7 +648,7 @@
 	return err;
 }
 
-int hostfs_unlink(struct inode *ino, struct dentry *dentry)
+static int hostfs_unlink(struct inode *ino, struct dentry *dentry)
 {
 	char *file;
 	int err;
@@ -662,7 +664,8 @@
 	return err;
 }
 
-int hostfs_symlink(struct inode *ino, struct dentry *dentry, const char *to)
+static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
+			  const char *to)
 {
 	char *file;
 	int err;
@@ -674,7 +677,7 @@
 	return err;
 }
 
-int hostfs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
+static int hostfs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
 {
 	char *file;
 	int err;
@@ -686,7 +689,7 @@
 	return err;
 }
 
-int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
+static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
 {
 	char *file;
 	int err;
@@ -738,8 +741,8 @@
 	return err;
 }
 
-int hostfs_rename(struct inode *from_ino, struct dentry *from,
-		  struct inode *to_ino, struct dentry *to)
+static int hostfs_rename(struct inode *from_ino, struct dentry *from,
+			 struct inode *to_ino, struct dentry *to)
 {
 	char *from_name, *to_name;
 	int err;
@@ -756,7 +759,7 @@
 	return err;
 }
 
-int hostfs_permission(struct inode *ino, int desired)
+static int hostfs_permission(struct inode *ino, int desired)
 {
 	char *name;
 	int r = 0, w = 0, x = 0, err;
@@ -782,7 +785,7 @@
 	return err;
 }
 
-int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = dentry->d_inode;
 	struct hostfs_iattr attrs;