Merge with /home/shaggy/git/linus-clean/

38 files changed, 223 insertions, 688 deletions

diff --git a/arch/um/Makefile b/arch/um/Makefile
index 6430a638385..c58b657f009 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -47,13 +47,16 @@ ARCH_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include
 endif
 SYS_DIR		:= $(ARCH_DIR)/include/sysdep-$(SUBARCH)
 
-# -Dvmap=kernel_vmap affects everything, and prevents anything from
-# referencing the libpcap.o symbol so named.
+# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
+# named - it's a common symbol in libpcap, so we get a binary which crashes.
 #
-# Same things for in6addr_loopback - found in libc.
+# Same things for in6addr_loopback and mktime - found in libc. For these two we
+# only get link-time error, luckily.
+#
+# These apply to USER_CFLAGS to.
 
-CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
-	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
+CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\"	\
+	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
 	-Din6addr_loopback=kernel_in6addr_loopback
 
 AFLAGS += $(ARCH_INCLUDE)
@@ -66,6 +69,7 @@ USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
 # kernel_errno to separate them from the libc errno.  This allows -fno-common
 # in CFLAGS.  Otherwise, it would cause ld to complain about the two different
 # errnos.
+# These apply to kernelspace only.
 
 CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
 	-Dmktime=kernel_mktime
@@ -168,10 +172,13 @@ else
 	$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
 endif
 
-$(ARCH_DIR)/include/sysdep:
+$(objtree)/$(ARCH_DIR)/include:
+	@echo '  MKDIR $@'
+	$(Q)mkdir -p $@
+
+$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
 	@echo '  SYMLINK $@'
 ifneq ($(KBUILD_SRC),)
-	$(Q)mkdir -p $(ARCH_DIR)/include
 	$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
 else
 	$(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
@@ -214,7 +221,7 @@ $(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/user-offsets.s
 
 CLEAN_FILES += $(ARCH_DIR)/user-offsets.s
 
-$(ARCH_DIR)/include/kern_constants.h:
+$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
 	@echo '  SYMLINK $@'
 	$(Q) ln -sf ../../../include/asm-um/asm-offsets.h $@
 
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index ab0d0b17081..7218c754505 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -403,7 +403,7 @@ int chan_window_size(struct list_head *chans, unsigned short *rows_out,
 	return 0;
 }
 
-void free_one_chan(struct chan *chan, int delay_free_irq)
+static void free_one_chan(struct chan *chan, int delay_free_irq)
 {
 	list_del(&chan->list);
 
@@ -416,7 +416,7 @@ void free_one_chan(struct chan *chan, int delay_free_irq)
 	kfree(chan);
 }
 
-void free_chan(struct list_head *chans, int delay_free_irq)
+static void free_chan(struct list_head *chans, int delay_free_irq)
 {
 	struct list_head *ele, *next;
 	struct chan *chan;
@@ -497,7 +497,7 @@ struct chan_type {
 	struct chan_ops *ops;
 };
 
-struct chan_type chan_table[] = {
+static struct chan_type chan_table[] = {
 	{ "fd", &fd_ops },
 
 #ifdef CONFIG_NULL_CHAN
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 5d50d4a44ab..2f880cb167a 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -9,6 +9,7 @@
 #include <termios.h>
 #include <string.h>
 #include <signal.h>
+#include <sched.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
@@ -73,7 +74,6 @@ static void winch_handler(int sig)
 struct winch_data {
 	int pty_fd;
 	int pipe_fd;
-	int close_me;
 };
 
 static int winch_thread(void *arg)
@@ -84,7 +84,6 @@ static int winch_thread(void *arg)
 	int count, err;
 	char c = 1;
 
-	os_close_file(data->close_me);
 	pty_fd = data->pty_fd;
 	pipe_fd = data->pipe_fd;
 	count = os_write_file(pipe_fd, &c, sizeof(c));
@@ -153,15 +152,16 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
 	}
 
 	data = ((struct winch_data) { .pty_fd 		= fd,
-				      .pipe_fd 		= fds[1],
-				      .close_me 	= fds[0] } );
-	err = run_helper_thread(winch_thread, &data, 0, &stack, 0);
+				      .pipe_fd 		= fds[1] } );
+	/* CLONE_FILES so this thread doesn't hold open files which are open
+	 * now, but later closed.  This is a problem with /dev/net/tun.
+	 */
+	err = run_helper_thread(winch_thread, &data, CLONE_FILES, &stack, 0);
 	if(err < 0){
 		printk("fork of winch_thread failed - errno = %d\n", errno);
 		goto out_close;
 	}
 
-	os_close_file(fds[1]);
 	*fd_out = fds[0];
 	n = os_read_file(fds[0], &c, sizeof(c));
 	if(n != sizeof(c)){
@@ -169,13 +169,12 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
 		printk("read failed, err = %d\n", -n);
 		printk("fd %d will not support SIGWINCH\n", fd);
                 err = -EINVAL;
-		goto out_close1;
+		goto out_close;
 	}
 	return err ;
 
  out_close:
 	os_close_file(fds[1]);
- out_close1:
 	os_close_file(fds[0]);
  out:
 	return err;
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
index dc36b222100..04e3958266e 100644
--- a/arch/um/drivers/cow.h
+++ b/arch/um/drivers/cow.h
@@ -46,7 +46,7 @@ extern int file_reader(__u64 offset, char *buf, int len, void *arg);
 extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
 			   void *arg, __u32 *version_out,
 			   char **backing_file_out, time_t *mtime_out,
-			   unsigned long long *size_out, int *sectorsize_out,
+			   __u64 *size_out, int *sectorsize_out,
 			   __u32 *align_out, int *bitmap_offset_out);
 
 extern int write_cow_header(char *cow_file, int fd, char *backing_file,
diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
index c83fc5d6893..94de4ead4f7 100644
--- a/arch/um/drivers/cow_sys.h
+++ b/arch/um/drivers/cow_sys.h
@@ -23,17 +23,17 @@ static inline char *cow_strdup(char *str)
 	return(uml_strdup(str));
 }
 
-static inline int cow_seek_file(int fd, unsigned long long offset)
+static inline int cow_seek_file(int fd, __u64 offset)
 {
 	return(os_seek_file(fd, offset));
 }
 
-static inline int cow_file_size(char *file, unsigned long long *size_out)
+static inline int cow_file_size(char *file, __u64 *size_out)
 {
 	return(os_file_size(file, size_out));
 }
 
-static inline int cow_write_file(int fd, char *buf, int size)
+static inline int cow_write_file(int fd, void *buf, int size)
 {
 	return(os_write_file(fd, buf, size));
 }
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
index fbe2217db5d..61951b72126 100644
--- a/arch/um/drivers/cow_user.c
+++ b/arch/um/drivers/cow_user.c
@@ -176,7 +176,7 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
 	err = -ENOMEM;
 	header = cow_malloc(sizeof(*header));
 	if(header == NULL){
-		cow_printf("Failed to allocate COW V3 header\n");
+		cow_printf("write_cow_header - failed to allocate COW V3 header\n");
 		goto out;
 	}
 	header->magic = htonl(COW_MAGIC);
@@ -196,15 +196,17 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
 
 	err = os_file_modtime(header->backing_file, &modtime);
 	if(err < 0){
-		cow_printf("Backing file '%s' mtime request failed, "
-			   "err = %d\n", header->backing_file, -err);
+		cow_printf("write_cow_header - backing file '%s' mtime "
+			   "request failed, err = %d\n", header->backing_file,
+			   -err);
 		goto out_free;
 	}
 
 	err = cow_file_size(header->backing_file, size);
 	if(err < 0){
-		cow_printf("Couldn't get size of backing file '%s', "
-			   "err = %d\n", header->backing_file, -err);
+		cow_printf("write_cow_header - couldn't get size of "
+			   "backing file '%s', err = %d\n",
+			   header->backing_file, -err);
 		goto out_free;
 	}
 
@@ -214,10 +216,11 @@ int write_cow_header(char *cow_file, int fd, char *backing_file,
 	header->alignment = htonl(alignment);
 	header->cow_format = COW_BITMAP;
 
-	err = os_write_file(fd, header, sizeof(*header));
+	err = cow_write_file(fd, header, sizeof(*header));
 	if(err != sizeof(*header)){
-		cow_printf("Write of header to new COW file '%s' failed, "
-			   "err = %d\n", cow_file, -err);
+		cow_printf("write_cow_header - write of header to "
+			   "new COW file '%s' failed, err = %d\n", cow_file,
+			   -err);
 		goto out_free;
 	}
 	err = 0;
@@ -299,7 +302,7 @@ int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
 	}
 	else if(version == 3){
 		if(n < sizeof(header->v3)){
-			cow_printf("read_cow_header - failed to read V2 "
+			cow_printf("read_cow_header - failed to read V3 "
 				   "header\n");
 			goto out;
 		}
@@ -359,7 +362,8 @@ int init_cow_file(int fd, char *cow_file, char *backing_file, int sectorsize,
 	if(err != sizeof(zero)){
 		cow_printf("Write of bitmap to new COW file '%s' failed, "
 			   "err = %d\n", cow_file, -err);
-		err = -EINVAL;
+		if (err >= 0)
+			err = -EINVAL;
 		goto out;
 	}
 
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
index 507e3cbac9d..a61b7b46bc0 100644
--- a/arch/um/drivers/daemon_kern.c
+++ b/arch/um/drivers/daemon_kern.c
@@ -18,7 +18,7 @@ struct daemon_init {
 	char *ctl_sock;
 };
 
-void daemon_init(struct net_device *dev, void *data)
+static void daemon_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct daemon_data *dpri;
@@ -64,7 +64,7 @@ static struct net_kern_info daemon_kern_info = {
 	.write			= daemon_write,
 };
 
-int daemon_setup(char *str, char **mac_out, void *data)
+static int daemon_setup(char *str, char **mac_out, void *data)
 {
 	struct daemon_init *init = data;
 	char *remain;
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 46ceb25a995..6c2d4ccaf20 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -714,7 +714,7 @@ struct winch {
 	struct tty_struct *tty;
 };
 
-irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
+static irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
 {
 	struct winch *winch = data;
 	struct tty_struct *tty;
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
index 217438cdef3..c9b078fba03 100644
--- a/arch/um/drivers/mcast_kern.c
+++ b/arch/um/drivers/mcast_kern.c
@@ -26,7 +26,7 @@ struct mcast_init {
 	int ttl;
 };
 
-void mcast_init(struct net_device *dev, void *data)
+static void mcast_init(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct mcast_data *dpri;
@@ -40,7 +40,7 @@ void mcast_init(struct net_device *dev, void *data)
 	dpri->dev = dev;
 
 	printk("mcast backend ");
-	printk("multicast adddress: %s:%u, TTL:%u ",
+	printk("multicast address: %s:%u, TTL:%u ",
 	       dpri->addr, dpri->port, dpri->ttl);
 
 	printk("\n");
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index e3d57656717..54388d10bcf 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -273,7 +273,7 @@ void mconsole_proc(struct mc_request *req)
     config <dev> - Query the configuration of a device \n\
     remove <dev> - Remove a device from UML \n\
     sysrq <letter> - Performs the SysRq action controlled by the letter \n\
-    cad - invoke the Ctl-Alt-Del handler \n\
+    cad - invoke the Ctrl-Alt-Del handler \n\
     stop - pause the UML; it will do nothing until it receives a 'go' \n\
     go - continue the UML after a 'stop' \n\
     log <string> - make UML enter <string> into the kernel log\n\
@@ -327,7 +327,7 @@ void mconsole_stop(struct mc_request *req)
 
 /* This list is populated by __initcall routines. */
 
-LIST_HEAD(mconsole_devices);
+static LIST_HEAD(mconsole_devices);
 
 void mconsole_register_dev(struct mc_device *new)
 {
@@ -561,6 +561,8 @@ void mconsole_sysrq(struct mc_request *req)
 }
 #endif
 
+#ifdef CONFIG_MODE_SKAS
+
 static void stack_proc(void *arg)
 {
 	struct task_struct *from = current, *to = arg;
@@ -574,7 +576,7 @@ static void stack_proc(void *arg)
  *  Dumps a stacks registers to the linux console.
  *  Usage stack <pid>.
  */
-void do_stack(struct mc_request *req)
+static void do_stack_trace(struct mc_request *req)
 {
 	char *ptr = req->request.data;
 	int pid_requested= -1;
@@ -605,6 +607,7 @@ void do_stack(struct mc_request *req)
 	}
 	with_console(req, stack_proc, to);
 }
+#endif /* CONFIG_MODE_SKAS */
 
 void mconsole_stack(struct mc_request *req)
 {
@@ -613,7 +616,7 @@ void mconsole_stack(struct mc_request *req)
 	 */
 	CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode",
 				   1, 0),
-		    do_stack(req));
+		    do_stack_trace(req));
 }
 
 /* Changed by mconsole_setup, which is __setup, and called before SMP is
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 8ebb2241ad4..8c7279bb353 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -131,9 +131,8 @@ static int uml_net_open(struct net_device *dev)
 			     SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
 	if(err != 0){
 		printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
-		if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
-		lp->fd = -1;
 		err = -ENETUNREACH;
+		goto out_close;
 	}
 
 	lp->tl.data = (unsigned long) &lp->user;
@@ -145,9 +144,19 @@ static int uml_net_open(struct net_device *dev)
 	 */
 	while((err = uml_net_rx(dev)) > 0) ;
 
- out:
 	spin_unlock(&lp->lock);
-	return(err);
+
+	spin_lock(&opened_lock);
+	list_add(&lp->list, &opened);
+	spin_unlock(&opened_lock);
+
+	return 0;
+out_close:
+	if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
+	lp->fd = -1;
+out:
+	spin_unlock(&lp->lock);
+	return err;
 }
 
 static int uml_net_close(struct net_device *dev)
@@ -161,9 +170,13 @@ static int uml_net_close(struct net_device *dev)
 	if(lp->close != NULL)
 		(*lp->close)(lp->fd, &lp->user);
 	lp->fd = -1;
-	list_del(&lp->list);
 
 	spin_unlock(&lp->lock);
+
+	spin_lock(&opened_lock);
+	list_del(&lp->list);
+	spin_unlock(&opened_lock);
+
 	return 0;
 }
 
@@ -410,11 +423,7 @@ static int eth_configure(int n, void *init, char *mac,
 	if (device->have_mac)
 		set_ether_mac(dev, device->mac);
 
-	spin_lock(&opened_lock);
-	list_add(&lp->list, &opened);
-	spin_unlock(&opened_lock);
-
-	return(0);
+	return 0;
 }
 
 static struct uml_net *find_device(int n)
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index 098fa65981a..0e2f06187ea 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -47,10 +47,12 @@ void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
 	}
 }
 
+/* Do reliable error handling as this fails frequently enough. */
 void read_output(int fd, char *output, int len)
 {
-	int remain, n, actual;
+	int remain, ret, expected;
 	char c;
+	char *str;
 
 	if(output == NULL){
 		output = &c;
@@ -58,23 +60,31 @@ void read_output(int fd, char *output, int len)
 	}
 		
 	*output = '\0';
-	n = os_read_file(fd, &remain, sizeof(remain));
-	if(n != sizeof(remain)){
-		printk("read_output - read of length failed, err = %d\n", -n);
-		return;
+	ret = os_read_file(fd, &remain, sizeof(remain));
+
+	if (ret != sizeof(remain)) {
+		expected = sizeof(remain);
+		str = "length";
+		goto err;
 	}
 
 	while(remain != 0){
-		n = (remain < len) ? remain : len;
-		actual = os_read_file(fd, output, n);
-		if(actual != n){
-			printk("read_output - read of data failed, "
-			       "err = %d\n", -actual);
-			return;
+		expected = (remain < len) ? remain : len;
+		ret = os_read_file(fd, output, expected);
+		if (ret != expected) {
+			str = "data";
+			goto err;
 		}
-		remain -= actual;
+		remain -= ret;
 	}
+
 	return;
+
+err:
+	if (ret < 0)
+		printk("read_output - read of %s failed, errno = %d\n", str, -ret);
+	else
+		printk("read_output - read of %s failed, read only %d of %d bytes\n", str, ret, expected);
 }
 
 int net_read(int fd, void *buf, int len)
diff --git a/arch/um/drivers/slip_common.h b/arch/um/drivers/slip_common.h
index 2ae76d8f1be..d574e0a9dc1 100644
--- a/arch/um/drivers/slip_common.h
+++ b/arch/um/drivers/slip_common.h
@@ -88,12 +88,13 @@ struct slip_proto {
 	int esc;
 };
 
-#define SLIP_PROTO_INIT { \
-	.ibuf  	= { '\0' }, \
-	.obuf  	= { '\0' }, \
-        .more	= 0, \
-	.pos	= 0, \
-	.esc	= 0 \
+static inline void slip_proto_init(struct slip_proto * slip)
+{
+	memset(slip->ibuf, 0, sizeof(slip->ibuf));
+	memset(slip->obuf, 0, sizeof(slip->obuf));
+	slip->more = 0;
+	slip->pos = 0;
+	slip->esc = 0;
 }
 
 extern int slip_proto_read(int fd, void *buf, int len,
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
index 9a6f5c85f90..a62f5ef445c 100644
--- a/arch/um/drivers/slip_kern.c
+++ b/arch/um/drivers/slip_kern.c
@@ -21,13 +21,14 @@ void slip_init(struct net_device *dev, void *data)
 
 	private = dev->priv;
 	spri = (struct slip_data *) private->user;
-	*spri = ((struct slip_data)
-		{ .name 	= { '\0' },
-		  .addr		= NULL,
-		  .gate_addr 	= init->gate_addr,
-		  .slave  	= -1,
-		  .slip		= SLIP_PROTO_INIT,
-		  .dev 		= dev });
+
+	memset(spri->name, 0, sizeof(spri->name));
+	spri->addr = NULL;
+	spri->gate_addr = init->gate_addr;
+	spri->slave = -1;
+	spri->dev = dev;
+
+	slip_proto_init(&spri->slip);
 
 	dev->init = NULL;
 	dev->header_cache_update = NULL;
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
index 9864d27afdb..33d7982be5d 100644
--- a/arch/um/drivers/slirp_kern.c
+++ b/arch/um/drivers/slirp_kern.c
@@ -21,12 +21,13 @@ void slirp_init(struct net_device *dev, void *data)
 
 	private = dev->priv;
 	spri = (struct slirp_data *) private->user;
-	*spri = ((struct slirp_data)
-		{ .argw 	= init->argw,
-		  .pid  	= -1,
-		  .slave  	= -1,
-		  .slip		= SLIP_PROTO_INIT,
-		  .dev 		= dev });
+
+	spri->argw = init->argw;
+	spri->pid = -1;
+	spri->slave = -1;
+	spri->dev = dev;
+
+	slip_proto_init(&spri->slip);
 
 	dev->init = NULL;
 	dev->hard_header_len = 0;
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index a32ef55cb24..a4d6415bc8c 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -33,7 +33,7 @@ static struct tty_driver *ssl_driver;
 
 #define NR_PORTS 64
 
-void ssl_announce(char *dev_name, int dev)
+static void ssl_announce(char *dev_name, int dev)
 {
 	printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
 	       dev_name);
@@ -98,7 +98,7 @@ static int ssl_remove(int n)
 	return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n);
 }
 
-int ssl_open(struct tty_struct *tty, struct file *filp)
+static int ssl_open(struct tty_struct *tty, struct file *filp)
 {
 	return line_open(serial_lines, tty);
 }
@@ -182,7 +182,7 @@ static struct console ssl_cons = {
 	.index		= -1,
 };
 
-int ssl_init(void)
+static int ssl_init(void)
 {
 	char *new_title;
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 101efd26d46..fa617e0719a 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1135,7 +1135,7 @@ static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
 static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
 {
 	unsigned long modtime;
-	long long actual;
+	unsigned long long actual;
 	int err;
 
 	err = os_file_modtime(file, &modtime);
diff --git a/arch/um/include/init.h b/arch/um/include/init.h
index cbd79a8d213..d4de7c0120c 100644
--- a/arch/um/include/init.h
+++ b/arch/um/include/init.h
@@ -122,7 +122,7 @@ extern struct uml_param __uml_setup_start, __uml_setup_end;
 
 #define __exitcall(fn) static exitcall_t __exitcall_##fn __exit_call = fn
 
-#define __init_call __attribute__ ((unused,__section__ (".initcall.init")))
+#define __init_call	__attribute_used__ __attribute__ ((__section__ (".initcall.init")))
 
 #endif
 
diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index c649108a9e9..07176d92e1c 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -31,8 +31,6 @@ extern int timer_irq_inited;
 extern int jail;
 extern int nsyscalls;
 
-extern struct task_struct *idle_threads[NR_CPUS];
-
 #define UML_ROUND_DOWN(addr) ((void *)(((unsigned long) addr) & PAGE_MASK))
 #define UML_ROUND_UP(addr) \
 	UML_ROUND_DOWN(((unsigned long) addr) + PAGE_SIZE - 1)
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index eb1710b8125..2a1c64d8d0b 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -179,8 +179,11 @@ extern void os_stop_process(int pid);
 extern void os_kill_process(int pid, int reap_child);
 extern void os_kill_ptraced_process(int pid, int reap_child);
 extern void os_usr1_process(int pid);
+extern long os_ptrace_ldt(long pid, long addr, long data);
+
 extern int os_getpid(void);
 extern int os_getpgrp(void);
+
 extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
 extern void init_new_thread_signals(int altstack);
 extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h
index 4892e5fcef0..83b688ca198 100644
--- a/arch/um/include/registers.h
+++ b/arch/um/include/registers.h
@@ -14,7 +14,7 @@ extern int restore_fp_registers(int pid, unsigned long *fp_regs);
 extern void save_registers(int pid, union uml_pt_regs *regs);
 extern void restore_registers(int pid, union uml_pt_regs *regs);
 extern void init_registers(int pid);
-extern void get_safe_registers(unsigned long * regs);
+extern void get_safe_registers(unsigned long * regs, unsigned long * fp_regs);
 extern void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer);
 
 #endif
diff --git a/arch/um/kernel/exec_kern.c b/arch/um/kernel/exec_kern.c
index 569fe8b9b05..c264e1c05ab 100644
--- a/arch/um/kernel/exec_kern.c
+++ b/arch/um/kernel/exec_kern.c
@@ -33,7 +33,7 @@ void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
 extern void log_exec(char **argv, void *tty);
 
 static long execve1(char *file, char __user * __user *argv,
-		    char *__user __user *env)
+		    char __user *__user *env)
 {
         long error;
 
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index f3b583a878a..544665e0451 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -265,7 +265,7 @@ int init_maps(unsigned long physmem, unsigned long iomem, unsigned long highmem)
 	highmem_len = highmem_pages * sizeof(struct page);
 
 	total_pages = phys_pages + iomem_pages + highmem_pages;
-	total_len = phys_len + iomem_pages + highmem_len;
+	total_len = phys_len + iomem_len + highmem_len;
 
 	if(kmalloc_ok){
 		map = kmalloc(total_len, GFP_KERNEL);
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
index 6f1a3a28811..3ef73bf2e78 100644
--- a/arch/um/kernel/reboot.c
+++ b/arch/um/kernel/reboot.c
@@ -5,6 +5,7 @@
 
 #include "linux/module.h"
 #include "linux/sched.h"
+#include "asm/smp.h"
 #include "user_util.h"
 #include "kern_util.h"
 #include "kern.h"
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
deleted file mode 100644
index eea1c9c4bb0..00000000000
--- a/arch/um/kernel/skas/process.c
+++ /dev/null
@@ -1,569 +0,0 @@
-/* 
- * Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com)
- * Licensed under the GPL
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <signal.h>
-#include <setjmp.h>
-#include <sched.h>
-#include <sys/wait.h>
-#include <sys/mman.h>
-#include <sys/user.h>
-#include <sys/time.h>
-#include <asm/unistd.h>
-#include <asm/types.h>
-#include "user.h"
-#include "ptrace_user.h"
-#include "sysdep/ptrace.h"
-#include "user_util.h"
-#include "kern_util.h"
-#include "skas.h"
-#include "stub-data.h"
-#include "mm_id.h"
-#include "sysdep/sigcontext.h"
-#include "sysdep/stub.h"
-#include "os.h"
-#include "proc_mm.h"
-#include "skas_ptrace.h"
-#include "chan_user.h"
-#include "registers.h"
-#include "mem.h"
-#include "uml-config.h"
-#include "process.h"
-
-int is_skas_winch(int pid, int fd, void *data)
-{
-        if(pid != os_getpgrp())
-		return(0);
-
-	register_winch_irq(-1, fd, -1, data);
-	return(1);
-}
-
-void wait_stub_done(int pid, int sig, char * fname)
-{
-        int n, status, err;
-
-        do {
-                if ( sig != -1 ) {
-                        err = ptrace(PTRACE_CONT, pid, 0, sig);
-                        if(err)
-                                panic("%s : continue failed, errno = %d\n",
-                                      fname, errno);
-                }
-                sig = 0;
-
-                CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
-        } while((n >= 0) && WIFSTOPPED(status) &&
-                ((WSTOPSIG(status) == SIGVTALRM) ||
-		 /* running UML inside a detached screen can cause
-		  * SIGWINCHes
-		  */
-		 (WSTOPSIG(status) == SIGWINCH)));
-
-        if((n < 0) || !WIFSTOPPED(status) ||
-           (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
-		unsigned long regs[HOST_FRAME_SIZE];
-		if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
-			printk("Failed to get registers from stub, "
-			       "errno = %d\n", errno);
-		else {
-			int i;
-
-			printk("Stub registers -\n");
-			for(i = 0; i < HOST_FRAME_SIZE; i++)
-				printk("\t%d - %lx\n", i, regs[i]);
-		}
-                panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
-                      "pid = %d, n = %d, errno = %d, status = 0x%x\n",
-                      fname, pid, n, errno, status);
-        }
-}
-
-void get_skas_faultinfo(int pid, struct faultinfo * fi)
-{
-        int err;
-
-        if(ptrace_faultinfo){
-                err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
-                if(err)
-                        panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
-                              "errno = %d\n", errno);
-
-                /* Special handling for i386, which has different structs */
-                if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
-                        memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
-                               sizeof(struct faultinfo) -
-                               sizeof(struct ptrace_faultinfo));
-        }
-        else {
-                wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo");
-
-                /* faultinfo is prepared by the stub-segv-handler at start of
-                 * the stub stack page. We just have to copy it.
-                 */
-                memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
-        }
-}
-
-static void handle_segv(int pid, union uml_pt_regs * regs)
-{
-        get_skas_faultinfo(pid, &regs->skas.faultinfo);
-        segv(regs->skas.faultinfo, 0, 1, NULL);
-}
-
-/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
-static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
-{
-	int err, status;
-
-	/* Mark this as a syscall */
-	UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
-
-	if (!local_using_sysemu)
-	{
-		err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
-		if(err < 0)
-			panic("handle_trap - nullifying syscall failed errno = %d\n",
-			      errno);
-
-		err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
-		if(err < 0)
-			panic("handle_trap - continuing to end of syscall failed, "
-			      "errno = %d\n", errno);
-
-		CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
-		if((err < 0) || !WIFSTOPPED(status) ||
-		   (WSTOPSIG(status) != SIGTRAP + 0x80))
-			panic("handle_trap - failed to wait at end of syscall, "
-			      "errno = %d, status = %d\n", errno, status);
-	}
-
-	handle_syscall(regs);
-}
-
-extern int __syscall_stub_start;
-int stub_code_fd = -1;
-__u64 stub_code_offset;
-
-static int userspace_tramp(void *stack)
-{
-	void *addr;
-
-	ptrace(PTRACE_TRACEME, 0, 0, 0);
-
-	init_new_thread_signals(1);
-	enable_timer();
-
-	if(!proc_mm){
-		/* This has a pte, but it can't be mapped in with the usual
-		 * tlb_flush mechanism because this is part of that mechanism
-		 */
-		addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
-			      PROT_EXEC, MAP_FIXED | MAP_PRIVATE,
-			      stub_code_fd, stub_code_offset);
-		if(addr == MAP_FAILED){
-			printk("mapping stub code failed, errno = %d\n",
-			       errno);
-			exit(1);
-		}
-
-		if(stack != NULL){
-			int fd;
-			__u64 offset;
-
-			fd = phys_mapping(to_phys(stack), &offset);
-			addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
-				    PROT_READ | PROT_WRITE,
-				    MAP_FIXED | MAP_SHARED, fd, offset);
-			if(addr == MAP_FAILED){
-				printk("mapping stub stack failed, "
-				       "errno = %d\n", errno);
-				exit(1);
-			}
-		}
-	}
-	if(!ptrace_faultinfo){
-		unsigned long v = UML_CONFIG_STUB_CODE +
-				  (unsigned long) stub_segv_handler -
-				  (unsigned long) &__syscall_stub_start;
-
-		set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
-		set_handler(SIGSEGV, (void *) v, SA_ONSTACK,
-			    SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
-			    SIGUSR1, -1);
-	}
-
-	os_stop_process(os_getpid());
-	return(0);
-}
-
-/* Each element set once, and only accessed by a single processor anyway */
-#undef NR_CPUS
-#define NR_CPUS 1
-int userspace_pid[NR_CPUS];
-
-int start_userspace(unsigned long stub_stack)
-{
-	void *stack;
-	unsigned long sp;
-	int pid, status, n, flags;
-
-	if ( stub_code_fd == -1 )
-		stub_code_fd = phys_mapping(to_phys(&__syscall_stub_start),
-					    &stub_code_offset);
-
-	stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
-		     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-	if(stack == MAP_FAILED)
-		panic("start_userspace : mmap failed, errno = %d", errno);
-	sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
-
-	flags = CLONE_FILES | SIGCHLD;
-	if(proc_mm) flags |= CLONE_VM;
-	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
-	if(pid < 0)
-		panic("start_userspace : clone failed, errno = %d", errno);
-
-	do {
-		CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
-		if(n < 0)
-			panic("start_userspace : wait failed, errno = %d", 
-			      errno);
-	} while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
-
-	if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
-		panic("start_userspace : expected SIGSTOP, got status = %d",
-		      status);
-
-	if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
-		panic("start_userspace : PTRACE_SETOPTIONS failed, errno=%d\n",
-		      errno);
-
-	if(munmap(stack, PAGE_SIZE) < 0)
-		panic("start_userspace : munmap failed, errno = %d\n", errno);
-
-	return(pid);
-}
-
-void userspace(union uml_pt_regs *regs)
-{
-	int err, status, op, pid = userspace_pid[0];
-	int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
-
-	while(1){
-		restore_registers(pid, regs);
-
-		/* Now we set local_using_sysemu to be used for one loop */
-		local_using_sysemu = get_using_sysemu();
-
-		op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
-
-		err = ptrace(op, pid, 0, 0);
-		if(err)
-			panic("userspace - could not resume userspace process, "
-			      "pid=%d, ptrace operation = %d, errno = %d\n",
-			      op, errno);
-
-		CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
-		if(err < 0)
-			panic("userspace - waitpid failed, errno = %d\n", 
-			      errno);
-
-		regs->skas.is_user = 1;
-		save_registers(pid, regs);
-		UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
-
-		if(WIFSTOPPED(status)){
-		  	switch(WSTOPSIG(status)){
-			case SIGSEGV:
-                                if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo)
-                                        user_signal(SIGSEGV, regs, pid);
-                                else handle_segv(pid, regs);
-				break;
-			case SIGTRAP + 0x80:
-			        handle_trap(pid, regs, local_using_sysemu);
-				break;
-			case SIGTRAP:
-				relay_signal(SIGTRAP, regs);
-				break;
-			case SIGIO:
-			case SIGVTALRM:
-			case SIGILL:
-			case SIGBUS:
-			case SIGFPE:
-			case SIGWINCH:
-                                user_signal(WSTOPSIG(status), regs, pid);
-				break;
-			default:
-			        printk("userspace - child stopped with signal "
-				       "%d\n", WSTOPSIG(status));
-			}
-			pid = userspace_pid[0];
-			interrupt_end();
-
-			/* Avoid -ERESTARTSYS handling in host */
-			PT_SYSCALL_NR(regs->skas.regs) = -1;
-		}
-	}
-}
-#define INIT_JMP_NEW_THREAD 0
-#define INIT_JMP_REMOVE_SIGSTACK 1
-#define INIT_JMP_CALLBACK 2
-#define INIT_JMP_HALT 3
-#define INIT_JMP_REBOOT 4
-
-
-int copy_context_skas0(unsigned long new_stack, int pid)
-{
-	int err;
-	unsigned long regs[MAX_REG_NR];
-	unsigned long current_stack = current_stub_stack();
-	struct stub_data *data = (struct stub_data *) current_stack;
-	struct stub_data *child_data = (struct stub_data *) new_stack;
-	__u64 new_offset;
-	int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
-
-	/* prepare offset and fd of child's stack as argument for parent's
-	 * and child's mmap2 calls
-	 */
-	*data = ((struct stub_data) { .offset	= MMAP_OFFSET(new_offset),
-				      .fd	= new_fd,
-				      .timer	= ((struct itimerval)
-					           { { 0, 1000000 / hz() },
-						     { 0, 1000000 / hz() }})});
-	get_safe_registers(regs);
-
-	/* Set parent's instruction pointer to start of clone-stub */
-	regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
-				(unsigned long) stub_clone_handler -
-				(unsigned long) &__syscall_stub_start;
-	regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
-		sizeof(void *);
-	err = ptrace_setregs(pid, regs);
-	if(err < 0)
-		panic("copy_context_skas0 : PTRACE_SETREGS failed, "
-		      "pid = %d, errno = %d\n", pid, errno);
-
-	/* set a well known return code for detection of child write failure */
-	child_data->err = 12345678;
-
-	/* Wait, until parent has finished its work: read child's pid from
-	 * parent's stack, and check, if bad result.
-	 */
-	wait_stub_done(pid, 0, "copy_context_skas0");
-
-	pid = data->err;
-	if(pid < 0)
-		panic("copy_context_skas0 - stub-parent reports error %d\n",
-		      pid);
-
-	/* Wait, until child has finished too: read child's result from
-	 * child's stack and check it.
-	 */
-	wait_stub_done(pid, -1, "copy_context_skas0");
-	if (child_data->err != UML_CONFIG_STUB_DATA)
-		panic("copy_context_skas0 - stub-child reports error %d\n",
-		      child_data->err);
-
-	if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
-		   (void *)PTRACE_O_TRACESYSGOOD) < 0)
-		panic("copy_context_skas0 : PTRACE_SETOPTIONS failed, "
-		      "errno = %d\n", errno);
-
-	return pid;
-}
-
-/*
- * This is used only, if stub pages are needed, while proc_mm is
- * availabl. Opening /proc/mm creates a new mm_context, which lacks
- * the stub-pages. Thus, we map them using /proc/mm-fd
- */
-void map_stub_pages(int fd, unsigned long code,
-		    unsigned long data, unsigned long stack)
-{
-	struct proc_mm_op mmop;
-	int n;
-
-	mmop = ((struct proc_mm_op) { .op        = MM_MMAP,
-				      .u         =
-				      { .mmap    =
-					{ .addr    = code,
-					  .len     = PAGE_SIZE,
-					  .prot    = PROT_EXEC,
-					  .flags   = MAP_FIXED | MAP_PRIVATE,
-					  .fd      = stub_code_fd,
-					  .offset  = stub_code_offset
-	} } });
-	n = os_write_file(fd, &mmop, sizeof(mmop));
-	if(n != sizeof(mmop))
-		panic("map_stub_pages : /proc/mm map for code failed, "
-		      "err = %d\n", -n);
-
-	if ( stack ) {
-		__u64 map_offset;
-		int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
-		mmop = ((struct proc_mm_op)
-				{ .op        = MM_MMAP,
-				  .u         =
-				  { .mmap    =
-				    { .addr    = data,
-				      .len     = PAGE_SIZE,
-				      .prot    = PROT_READ | PROT_WRITE,
-				      .flags   = MAP_FIXED | MAP_SHARED,
-				      .fd      = map_fd,
-				      .offset  = map_offset
-		} } });
-		n = os_write_file(fd, &mmop, sizeof(mmop));
-		if(n != sizeof(mmop))
-			panic("map_stub_pages : /proc/mm map for data failed, "
-			      "err = %d\n", -n);
-	}
-}
-
-void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
-		void (*handler)(int))
-{
-	unsigned long flags;
-	sigjmp_buf switch_buf, fork_buf;
-
-	*switch_buf_ptr = &switch_buf;
-	*fork_buf_ptr = &fork_buf;
-
-	/* Somewhat subtle - siglongjmp restores the signal mask before doing
-	 * the longjmp.  This means that when jumping from one stack to another
-	 * when the target stack has interrupts enabled, an interrupt may occur
-	 * on the source stack.  This is bad when starting up a process because
-	 * it's not supposed to get timer ticks until it has been scheduled.
-	 * So, we disable interrupts around the sigsetjmp to ensure that
-	 * they can't happen until we get back here where they are safe.
-	 */
-	flags = get_signals();
-	block_signals();
-	if(sigsetjmp(fork_buf, 1) == 0)
-		new_thread_proc(stack, handler);
-
-	remove_sigstack();
-
-	set_signals(flags);
-}
-
-void thread_wait(void *sw, void *fb)
-{
-	sigjmp_buf buf, **switch_buf = sw, *fork_buf;
-
-	*switch_buf = &buf;
-	fork_buf = fb;
-	if(sigsetjmp(buf, 1) == 0)
-		siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK);
-}
-
-void switch_threads(void *me, void *next)
-{
-	sigjmp_buf my_buf, **me_ptr = me, *next_buf = next;
-	
-	*me_ptr = &my_buf;
-	if(sigsetjmp(my_buf, 1) == 0)
-		siglongjmp(*next_buf, 1);
-}
-
-static sigjmp_buf initial_jmpbuf;
-
-/* XXX Make these percpu */
-static void (*cb_proc)(void *arg);
-static void *cb_arg;
-static sigjmp_buf *cb_back;
-
-int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
-{
-	sigjmp_buf **switch_buf = switch_buf_ptr;
-	int n;
-
-	set_handler(SIGWINCH, (__sighandler_t) sig_handler,
-		    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
-		    SIGVTALRM, -1);
-
-	*fork_buf_ptr = &initial_jmpbuf;
-	n = sigsetjmp(initial_jmpbuf, 1);
-        switch(n){
-        case INIT_JMP_NEW_THREAD:
-                new_thread_proc((void *) stack, new_thread_handler);
-                break;
-        case INIT_JMP_REMOVE_SIGSTACK:
-                remove_sigstack();
-                break;
-        case INIT_JMP_CALLBACK:
-		(*cb_proc)(cb_arg);
-		siglongjmp(*cb_back, 1);
-                break;
-        case INIT_JMP_HALT:
-		kmalloc_ok = 0;
-		return(0);
-        case INIT_JMP_REBOOT:
-		kmalloc_ok = 0;
-		return(1);
-        default:
-                panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
-	}
-	siglongjmp(**switch_buf, 1);
-}
-
-void initial_thread_cb_skas(void (*proc)(void *), void *arg)
-{
-	sigjmp_buf here;
-
-	cb_proc = proc;
-	cb_arg = arg;
-	cb_back = &here;
-
-	block_signals();
-	if(sigsetjmp(here, 1) == 0)
-		siglongjmp(initial_jmpbuf, INIT_JMP_CALLBACK);
-	unblock_signals();
-
-	cb_proc = NULL;
-	cb_arg = NULL;
-	cb_back = NULL;
-}
-
-void halt_skas(void)
-{
-	block_signals();
-	siglongjmp(initial_jmpbuf, INIT_JMP_HALT);
-}
-
-void reboot_skas(void)
-{
-	block_signals();
-	siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT);
-}
-
-void switch_mm_skas(struct mm_id *mm_idp)
-{
-	int err;
-
-#warning need cpu pid in switch_mm_skas
-	if(proc_mm){
-		err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
-			     mm_idp->u.mm_fd);
-		if(err)
-			panic("switch_mm_skas - PTRACE_SWITCH_MM failed, "
-			      "errno = %d\n", errno);
-	}
-	else userspace_pid[0] = mm_idp->u.pid;
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/tt/syscall_kern.c b/arch/um/kernel/tt/syscall_kern.c
index 3d29c90514c..3fda9a03c59 100644
--- a/arch/um/kernel/tt/syscall_kern.c
+++ b/arch/um/kernel/tt/syscall_kern.c
@@ -23,16 +23,20 @@ void syscall_handler_tt(int sig, struct pt_regs *regs)
 	int syscall;
 #ifdef CONFIG_SYSCALL_DEBUG
 	int index;
-  	index = record_syscall_start(syscall);
 #endif
 	sc = UPT_SC(&regs->regs);
 	SC_START_SYSCALL(sc);
 
+	syscall = UPT_SYSCALL_NR(&regs->regs);
+
+#ifdef CONFIG_SYSCALL_DEBUG
+	index = record_syscall_start(syscall);
+#endif
+
 	syscall_trace(&regs->regs, 0);
 
 	current->thread.nsyscalls++;
 	nsyscalls++;
-	syscall = UPT_SYSCALL_NR(&regs->regs);
 
 	if((syscall >= NR_syscalls) || (syscall < 0))
 		result = -ENOSYS;
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e2d3ca445ef..27cdf916442 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -193,6 +193,24 @@ __uml_setup("root=", uml_root_setup,
 "        root=/dev/ubd5\n\n"
 );
 
+#ifndef CONFIG_MODE_TT
+
+static int __init no_skas_debug_setup(char *line, int *add)
+{
+	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
+	printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
+	printf("doesn't work as expected\n");
+
+	return 0;
+}
+
+__uml_setup("debug", no_skas_debug_setup,
+"debug\n"
+"    this flag is not needed to run gdb on UML in skas mode\n\n"
+);
+
+#endif
+
 #ifdef CONFIG_SMP
 static int __init uml_ncpus_setup(char *line, int *add)
 {
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
index 52945338b64..87c3aa0252d 100644
--- a/arch/um/os-Linux/drivers/tuntap_user.c
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -122,6 +122,7 @@ static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
 		return(-EINVAL);
 	}
 	*fd_out = ((int *) CMSG_DATA(cmsg))[0];
+	os_set_exec_close(*fd_out, 1);
 	return(0);
 }
 
@@ -137,7 +138,8 @@ static int tuntap_open(void *data)
 		return(err);
 
 	if(pri->fixed_config){
-		pri->fd = os_open_file("/dev/net/tun", of_rdwr(OPENFLAGS()), 0);
+		pri->fd = os_open_file("/dev/net/tun",
+				       of_cloexec(of_rdwr(OPENFLAGS())), 0);
 		if(pri->fd < 0){
 			printk("Failed to open /dev/net/tun, err = %d\n",
 			       -pri->fd);
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index f55773c819e..3bd10deea28 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -272,14 +272,23 @@ int os_connect_socket(char *name)
 	snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
 
 	fd = socket(AF_UNIX, SOCK_STREAM, 0);
-	if(fd < 0)
-		return(fd);
+	if(fd < 0) {
+		err = -errno;
+		goto out;
+	}
 
 	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
-	if(err)
-		return(-errno);
+	if(err) {
+		err = -errno;
+		goto out_close;
+	}
 
-	return(fd);
+	return fd;
+
+out_close:
+	close(fd);
+out:
+	return err;
 }
 
 void os_close_file(int fd)
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 7f5e2dac2a3..d261888f39c 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -19,6 +19,7 @@
 #include "irq_user.h"
 #include "kern_util.h"
 #include "longjmp.h"
+#include "skas_ptrace.h"
 
 #define ARBITRARY_ADDR -1
 #define FAILURE_PID    -1
@@ -100,6 +101,21 @@ void os_kill_process(int pid, int reap_child)
 		
 }
 
+/* This is here uniquely to have access to the userspace errno, i.e. the one
+ * used by ptrace in case of error.
+ */
+
+long os_ptrace_ldt(long pid, long addr, long data)
+{
+	int ret;
+
+	ret = ptrace(PTRACE_LDT, pid, addr, data);
+
+	if (ret < 0)
+		return -errno;
+	return ret;
+}
+
 /* Kill off a ptraced child by all means available.  kill it normally first,
  * then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
  * which it can't exit directly.
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index 9890e9090f5..fbb080c2fc2 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -60,7 +60,7 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 
 	multi_count++;
 
-	get_safe_registers(regs);
+	get_safe_registers(regs, NULL);
 	regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
 		((unsigned long) &batch_syscall_stub -
 		 (unsigned long) &__syscall_stub_start);
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 120a21c5883..bbf34cb91ce 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -310,16 +310,12 @@ void userspace(union uml_pt_regs *regs)
 		}
 	}
 }
-#define INIT_JMP_NEW_THREAD 0
-#define INIT_JMP_REMOVE_SIGSTACK 1
-#define INIT_JMP_CALLBACK 2
-#define INIT_JMP_HALT 3
-#define INIT_JMP_REBOOT 4
 
 int copy_context_skas0(unsigned long new_stack, int pid)
 {
 	int err;
-	unsigned long regs[MAX_REG_NR];
+	unsigned long regs[HOST_FRAME_SIZE];
+	unsigned long fp_regs[HOST_FP_SIZE];
 	unsigned long current_stack = current_stub_stack();
 	struct stub_data *data = (struct stub_data *) current_stack;
 	struct stub_data *child_data = (struct stub_data *) new_stack;
@@ -334,7 +330,7 @@ int copy_context_skas0(unsigned long new_stack, int pid)
 				      .timer    = ((struct itimerval)
 					            { { 0, 1000000 / hz() },
 						      { 0, 1000000 / hz() }})});
-	get_safe_registers(regs);
+	get_safe_registers(regs, fp_regs);
 
 	/* Set parent's instruction pointer to start of clone-stub */
 	regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
@@ -350,6 +346,11 @@ int copy_context_skas0(unsigned long new_stack, int pid)
 		panic("copy_context_skas0 : PTRACE_SETREGS failed, "
 		      "pid = %d, errno = %d\n", pid, errno);
 
+	err = ptrace_setfpregs(pid, fp_regs);
+	if(err < 0)
+		panic("copy_context_skas0 : PTRACE_SETFPREGS failed, "
+		      "pid = %d, errno = %d\n", pid, errno);
+
 	/* set a well known return code for detection of child write failure */
 	child_data->err = 12345678;
 
@@ -457,6 +458,12 @@ void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
 	set_signals(flags);
 }
 
+#define INIT_JMP_NEW_THREAD 0
+#define INIT_JMP_REMOVE_SIGSTACK 1
+#define INIT_JMP_CALLBACK 2
+#define INIT_JMP_HALT 3
+#define INIT_JMP_REBOOT 4
+
 void thread_wait(void *sw, void *fb)
 {
 	sigjmp_buf buf, **switch_buf = sw, *fork_buf;
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 6c5b17ed59e..829d6b0d8b0 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -49,6 +49,7 @@ static int ptrace_child(void *arg)
 	int pid = os_getpid(), ppid = getppid();
 	int sc_result;
 
+	change_sig(SIGWINCH, 0);
 	if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
 		perror("ptrace");
 		os_kill_process(pid, 0);
diff --git a/arch/um/os-Linux/sys-i386/registers.c b/arch/um/os-Linux/sys-i386/registers.c
index aee4812333c..7a6f6b99cef 100644
--- a/arch/um/os-Linux/sys-i386/registers.c
+++ b/arch/um/os-Linux/sys-i386/registers.c
@@ -122,9 +122,12 @@ void init_registers(int pid)
 		      err);
 }
 
-void get_safe_registers(unsigned long *regs)
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
 {
 	memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
+	if(fp_regs != NULL)
+		memcpy(fp_regs, exec_fp_regs,
+		       HOST_FP_SIZE * sizeof(unsigned long));
 }
 
 void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
diff --git a/arch/um/os-Linux/sys-x86_64/registers.c b/arch/um/os-Linux/sys-x86_64/registers.c
index 4b638dfb52b..001941fa1a1 100644
--- a/arch/um/os-Linux/sys-x86_64/registers.c
+++ b/arch/um/os-Linux/sys-x86_64/registers.c
@@ -70,9 +70,12 @@ void init_registers(int pid)
 		      err);
 }
 
-void get_safe_registers(unsigned long *regs)
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
 {
 	memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
+	if(fp_regs != NULL)
+		memcpy(fp_regs, exec_fp_regs,
+		       HOST_FP_SIZE * sizeof(unsigned long));
 }
 
 void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index 0cdfd4481d5..fe0877b3509 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -16,7 +16,6 @@
 #include "choose-mode.h"
 #include "kern.h"
 #include "mode_kern.h"
-#include "proc_mm.h"
 #include "os.h"
 
 extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
@@ -90,6 +89,7 @@ out:
 #include "skas.h"
 #include "skas_ptrace.h"
 #include "asm/mmu_context.h"
+#include "proc_mm.h"
 
 long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 		     void **addr, int done)
@@ -107,7 +107,7 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 		 * So we need to switch child's mm into our userspace, then
 		 * later switch back.
 		 *
-		 * Note: I'm unshure: should interrupts be disabled here?
+		 * Note: I'm unsure: should interrupts be disabled here?
 		 */
 		if(!current->active_mm || current->active_mm == &init_mm ||
 		   mm_idp != &current->active_mm->context.skas.id)
@@ -129,9 +129,7 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 			pid = userspace_pid[cpu];
 		}
 
-		res = ptrace(PTRACE_LDT, pid, 0, (unsigned long) &ldt_op);
-		if(res)
-			res = errno;
+		res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
 
 		if(proc_mm)
 			put_cpu();
@@ -181,8 +179,7 @@ static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
 	 */
 
 	cpu = get_cpu();
-	res = ptrace(PTRACE_LDT, userspace_pid[cpu], 0,
-		     (unsigned long) &ptrace_ldt);
+	res = os_ptrace_ldt(userspace_pid[cpu], 0, (unsigned long) &ptrace_ldt);
 	put_cpu();
 	if(res < 0)
 		goto out;
diff --git a/arch/um/sys-x86_64/ptrace_user.c b/arch/um/sys-x86_64/ptrace_user.c
index 12e404c6fa4..b5f9c33e311 100644
--- a/arch/um/sys-x86_64/ptrace_user.c
+++ b/arch/um/sys-x86_64/ptrace_user.c
@@ -24,6 +24,13 @@ int ptrace_setregs(long pid, unsigned long *regs)
 	return(0);
 }
 
+int ptrace_setfpregs(long pid, unsigned long *regs)
+{
+	if (ptrace(PTRACE_SETFPREGS, pid, 0, regs) < 0)
+		return -errno;
+	return 0;
+}
+
 void ptrace_pokeuser(unsigned long addr, unsigned long data)
 {
 	panic("ptrace_pokeuser");
diff --git a/arch/um/sys-x86_64/user-offsets.c b/arch/um/sys-x86_64/user-offsets.c
index 5a585bfbb8c..7bd54a921cf 100644
--- a/arch/um/sys-x86_64/user-offsets.c
+++ b/arch/um/sys-x86_64/user-offsets.c
@@ -57,7 +57,7 @@ void foo(void)
 #endif
 
 	DEFINE_LONGS(HOST_FRAME_SIZE, FRAME_SIZE);
-	DEFINE(HOST_FP_SIZE, 0);
+	DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
 	DEFINE(HOST_XFP_SIZE, 0);
 	DEFINE_LONGS(HOST_RBX, RBX);
 	DEFINE_LONGS(HOST_RCX, RCX);