Merge uml.karaya.com:/home/jdike/linux/2.5/linus-2.5

into uml.karaya.com:/home/jdike/linux/2.5/work-2.5

arch/um/Makefile

 ARCH_DIR = arch/um
 OS := $(shell uname -s)
 
-include $(ARCH_DIR)/Makefile-$(SUBARCH)
-include $(ARCH_DIR)/Makefile-os-$(OS)
-
 EXTRAVERSION := $(EXTRAVERSION)-1um
 include/linux/version.h: arch/$(ARCH)/Makefile
 
@@ -59,17 +56,18 @@ ARCH_SYMLINKS = include/asm-um/arch arch/um/include/sysdep arch/um/os \
 
 GEN_HEADERS = $(ARCH_DIR)/include/task.h
 
+include $(ARCH_DIR)/Makefile-$(SUBARCH)
+include $(ARCH_DIR)/Makefile-os-$(OS)
+
 $(ARCH_DIR)/vmlinux.lds.S :
 	touch $@
 
 prepare: $(ARCH_SYMLINKS) $(GEN_HEADERS)
 
-
 LDFLAGS_vmlinux = -r $(ARCH_DIR)/main.o
 
 vmlinux: $(ARCH_DIR)/main.o 
 
-
 $(ARCH_DIR)/uml.lds.s : $(ARCH_DIR)/uml.lds.S scripts FORCE
 	$(call if_changed_dep,as_s_S)
 

arch/um/Makefile-i386

@@ -21,11 +21,14 @@ $(SYS_DIR)/sc.h: $(SYS_UTIL_DIR)/mk_sc
 $(SYS_DIR)/thread.h: $(SYS_UTIL_DIR)/mk_thread
 	$< > $@
 
-$(SYS_UTIL_DIR)/mk_sc $(SYS_UTIL_DIR)/mk_thread: $(SYS_UTIL_DIR) FORCE ; 
+$(SYS_UTIL_DIR)/mk_sc: FORCE ; 
+	@$(call descend,$(SYS_UTIL_DIR),$@)
+
+$(SYS_UTIL_DIR)/mk_thread: $(ARCH_SYMLINKS) FORCE ; 
+	@$(call descend,$(SYS_UTIL_DIR),$@)
 
 $(SYS_UTIL_DIR): include/asm FORCE
 	@$(call descend,$@,)
 
 sysclean :
 	rm -f $(SYS_HEADERS)
-	@$(call descend,$(SYS_DIR),clean)

arch/um/defconfig

@@ -219,13 +219,16 @@ CONFIG_EXT2_FS=y
 # CONFIG_INTERMEZZO_FS is not set
 # CONFIG_NFS_FS is not set
 # CONFIG_NFS_V3 is not set
+# CONFIG_NFS_V4 is not set
 # CONFIG_ROOT_NFS is not set
 # CONFIG_NFSD is not set
 # CONFIG_NFSD_V3 is not set
+# CONFIG_NFSD_V4 is not set
 # CONFIG_NFSD_TCP is not set
 # CONFIG_SUNRPC is not set
 # CONFIG_LOCKD is not set
 # CONFIG_EXPORTFS is not set
+# CONFIG_CIFS is not set
 # CONFIG_SMB_FS is not set
 # CONFIG_NCP_FS is not set
 # CONFIG_NCPFS_PACKET_SIGNING is not set
@@ -236,6 +239,7 @@ CONFIG_EXT2_FS=y
 # CONFIG_NCPFS_SMALLDOS is not set
 # CONFIG_NCPFS_NLS is not set
 # CONFIG_NCPFS_EXTRAS is not set
+# CONFIG_AFS_FS is not set
 # CONFIG_ZISOFS_FS is not set
 
 #
@@ -332,7 +336,9 @@ CONFIG_SCSI_DEBUG=y
 CONFIG_MTD=y
 # CONFIG_MTD_DEBUG is not set
 # CONFIG_MTD_PARTITIONS is not set
+# CONFIG_MTD_CONCAT is not set
 # CONFIG_MTD_REDBOOT_PARTS is not set
+# CONFIG_MTD_CMDLINE_PARTS is not set
 
 #
 # User Modules And Translation Layers
@@ -362,6 +368,8 @@ CONFIG_MTD_BLOCK=y
 # Mapping drivers for chip access
 #
 # CONFIG_MTD_PHYSMAP is not set
+# CONFIG_MTD_PCI is not set
+# CONFIG_MTD_PCMCIA is not set
 
 #
 # Self-contained MTD device drivers

arch/um/drivers/Makefile

@@ -15,7 +15,7 @@ CHAN_OBJS := chan_kern.o chan_user.o line.o
 # So, what this does is figure out by hand (crudely) what file -lpcap really 
 # is and just use it.
 
-PCAP = $(shell for f in echo {/lib,/usr/lib}/libpcap.{a,so}; do \
+PCAP = $(shell for f in echo {/lib,/usr/lib}/libpcap.a; do \
        [ -f $$f ] && echo $$f ; done | head -1)
 
 slip-objs := slip_kern.o slip_user.o
@@ -47,7 +47,7 @@ obj-$(CONFIG_NULL_CHAN) += null.o
 obj-$(CONFIG_PORT_CHAN) += port.o
 obj-$(CONFIG_PTY_CHAN) += pty.o
 obj-$(CONFIG_TTY_CHAN) += tty.o 
-obj-$(CONFIG_XTERM_CHAN) += xterm.o
+obj-$(CONFIG_XTERM_CHAN) += xterm.o xterm_kern.o
 obj-$(CONFIG_UML_WATCHDOG) += harddog.o
 
 CFLAGS_pcap_user.o = -I/usr/include/pcap

arch/um/drivers/mconsole_kern.c

@@ -111,6 +111,8 @@ void mconsole_version(struct mc_request *req)
     remove <dev> - Remove a device from UML
     sysrq <letter> - Performs the SysRq action controlled by the letter
     cad - invoke the Ctl-Alt-Del handler
+    stop - pause the UML; it will do nothing until it receives a 'go'
+    go - continue the UML after a 'stop'
 "
 
 void mconsole_help(struct mc_request *req)

arch/um/drivers/port_kern.c

@@ -20,6 +20,7 @@
 
 struct port_list {
 	struct list_head list;
+	int has_connection;
 	struct semaphore sem;
 	int port;
 	int fd;
@@ -49,28 +50,32 @@ static void pipe_interrupt(int irq, void *data, struct pt_regs *regs)
 	struct connection *conn = data;
 	int fd;
 
-	list_del(&conn->list);
-
  	fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
 	if(fd < 0){
+		if(fd == -EAGAIN)
+			return;
+
 		printk("os_rcv_fd returned %d\n", -fd);
 		os_close_file(conn->fd);
 	}
+
+	list_del(&conn->list);
+
 	conn->fd = fd;
 	list_add(&conn->list, &conn->port->connections);
 
 	up(&conn->port->sem);
 }
 
-static void port_interrupt(int irq, void *data, struct pt_regs *regs)
+static int port_accept(struct port_list *port)
 {
-	struct port_list *port = data;
 	struct connection *conn;
-	int fd, socket[2], pid;
+	int fd, socket[2], pid, ret = 0;
 
 	fd = port_connection(port->fd, socket, &pid);
 	if(fd < 0){
-		printk("port_connection returned %d\n", -fd);
+		if(fd != -EAGAIN)
+			printk("port_connection returned %d\n", -fd);
 		goto out;
 	}
 
@@ -94,6 +99,7 @@ static void port_interrupt(int irq, void *data, struct pt_regs *regs)
 	}
 
 	list_add(&conn->list, &port->pending);
+	ret = 1;
 	goto out;
 
  out_free:
@@ -102,17 +108,45 @@ static void port_interrupt(int irq, void *data, struct pt_regs *regs)
 	os_close_file(fd);
 	if(pid != -1) os_kill_process(pid);
  out:
-	reactivate_fd(port->fd, ACCEPT_IRQ);
+	return(ret);
 } 
 
 DECLARE_MUTEX(ports_sem);
 struct list_head ports = LIST_HEAD_INIT(ports);
 
+void port_work_proc(void *unused)
+{
+	struct port_list *port;
+	struct list_head *ele;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	list_for_each(ele, &ports){
+		port = list_entry(ele, struct port_list, list);
+		if(!port->has_connection)
+			continue;
+		reactivate_fd(port->fd, ACCEPT_IRQ);
+		while(port_accept(port)) ;
+		port->has_connection = 0;
+	}
+	local_irq_restore(flags);
+}
+
+DECLARE_WORK(port_work, port_work_proc, NULL);
+
+static void port_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+	struct port_list *port = data;
+
+	port->has_connection = 1;
+	schedule_work(&port_work);
+} 
+
 void *port_data(int port_num)
 {
 	struct list_head *ele;
 	struct port_list *port;
-	struct port_dev *dev;
+	struct port_dev *dev = NULL;
 	int fd;
 
 	down(&ports_sem);
@@ -140,13 +174,14 @@ void *port_data(int port_num)
 	}
 
 	*port = ((struct port_list) 
-		{ list : 	LIST_HEAD_INIT(port->list),
-		  sem :		__SEMAPHORE_INITIALIZER(port->sem, 0),
-		  lock :	SPIN_LOCK_UNLOCKED,
-		  port : 	port_num,
-		  fd : 		fd,
-		  pending :	LIST_HEAD_INIT(port->pending),
-		  connections :	LIST_HEAD_INIT(port->connections) });
+		{ list :	 	LIST_HEAD_INIT(port->list),
+		  has_connection :	0,
+		  sem :			__SEMAPHORE_INITIALIZER(port->sem, 0),
+		  lock :		SPIN_LOCK_UNLOCKED,
+		  port :	 	port_num,
+		  fd : 			fd,
+		  pending :		LIST_HEAD_INIT(port->pending),
+		  connections :		LIST_HEAD_INIT(port->connections) });
 	list_add(&port->list, &ports);
 
  found:
@@ -159,8 +194,7 @@ void *port_data(int port_num)
  	*dev = ((struct port_dev) { port : 		port,
  				    fd :		-1,
  				    helper_pid : 	-1 });
-	up(&ports_sem);
-	return(dev);
+	goto out;
 
  out_free:
 	kfree(port);
@@ -168,7 +202,7 @@ void *port_data(int port_num)
 	os_close_file(fd);
  out:
 	up(&ports_sem);
-	return(NULL);
+	return(dev);
 }
 
 void port_remove_dev(void *d)

arch/um/drivers/ssl.c

@@ -44,6 +44,7 @@ static struct chan_opts opts = {
 	xterm_title:	"Serial Line #%d",
 	raw:		1,
 	tramp_stack :	0,
+	in_kernel :	1,
 };
 
 static struct line_driver driver = {

arch/um/drivers/stdio_console.c

@@ -75,6 +75,7 @@ static struct chan_opts opts = {
 	xterm_title:	"Virtual Console #%d",
 	raw:		1,
 	tramp_stack :	0,
+	in_kernel :	1,
 };
 
 static struct line_driver driver = {

arch/um/drivers/xterm.c

@@ -19,6 +19,7 @@
 #include "user_util.h"
 #include "user.h"
 #include "os.h"
+#include "xterm.h"
 
 struct xterm_chan {
 	int pid;
@@ -28,6 +29,7 @@ struct xterm_chan {
 	int raw;
 	struct termios tt;
 	unsigned long stack;
+	int direct_rcv;
 };
 
 void *xterm_init(char *str, int device, struct chan_opts *opts)
@@ -40,7 +42,8 @@ void *xterm_init(char *str, int device, struct chan_opts *opts)
 				       device :		device, 
 				       title :		opts->xterm_title,
 				       raw : 		opts->raw,
-				       stack :		opts->tramp_stack } );
+				       stack :		opts->tramp_stack,
+				       direct_rcv :	!opts->in_kernel } );
 	return(data);
 }
 
@@ -84,7 +87,7 @@ int xterm_open(int input, int output, int primary, void *d)
 {
 	struct xterm_chan *data = d;
 	unsigned long stack;
-	int pid, fd, new;
+	int pid, fd, new, err;
 	char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
 	char *argv[] = { terminal_emulator, title_switch, title, exec_switch, 
 			 "/usr/lib/uml/port-helper", "-uml-socket",
@@ -105,21 +108,30 @@ int xterm_open(int input, int output, int primary, void *d)
 	fd = create_unix_socket(file, sizeof(file));
 	if(fd < 0){
 		printk("xterm_open : create_unix_socket failed, errno = %d\n", 
-		       errno);
-		return(-errno);
+		       -fd);
+		return(-fd);
 	}
 
 	sprintf(title, data->title, data->device);
 	stack = data->stack;
 	pid = run_helper(NULL, NULL, argv, &stack);
 	if(pid < 0){
-		printk("xterm_open : run_helper failed\n");
-		return(-1);
+		printk("xterm_open : run_helper failed, errno = %d\n", -pid);
+		return(pid);
 	}
 
 	if(data->stack == 0) free_stack(stack, 0);
 
-	new = os_rcv_fd(fd, &data->helper_pid);
+	if(data->direct_rcv)
+		new = os_rcv_fd(fd, &data->helper_pid);
+	else {
+		if((err = os_set_fd_block(fd, 0)) != 0){
+			printk("xterm_open : failed to set descriptor "
+			       "non-blocking, errno = %d\n", err);
+			return(err);
+		}
+		new = xterm_fd(fd, &data->helper_pid);
+	}
 	if(new < 0){
 		printk("xterm_open : os_rcv_fd failed, errno = %d\n", -new);
 		return(new);

arch/um/drivers/xterm.h

+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __XTERM_H__
+#define __XTERM_H__
+
+extern int xterm_fd(int socket, int *pid_out);
+
+#endif
+
+/*
+ * 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:
+ */

arch/um/drivers/xterm_kern.c

+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/errno.h"
+#include "linux/slab.h"
+#include "asm/semaphore.h"
+#include "asm/irq.h"
+#include "irq_user.h"
+#include "kern_util.h"
+#include "os.h"
+#include "xterm.h"
+
+struct xterm_wait {
+	struct semaphore sem;
+	int fd;
+	int pid;
+	int new_fd;
+};
+
+static void xterm_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+	struct xterm_wait *xterm = data;
+
+	xterm->new_fd = os_rcv_fd(xterm->fd, &xterm->pid);
+	if(xterm->new_fd == -EAGAIN)
+		return;
+
+	up(&xterm->sem);
+}
+
+int xterm_fd(int socket, int *pid_out)
+{
+	struct xterm_wait *data;
+	int err, ret;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if(data == NULL){
+		printk(KERN_ERR "xterm_fd - failed to allocate semaphore\n");
+		return(-ENOMEM);
+	}
+	*data = ((struct xterm_wait) 
+		{ sem : 	__SEMAPHORE_INITIALIZER(data->sem, 0),
+		  fd :		socket,
+		  pid :		-1,
+		  new_fd :	-1 });
+
+	err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 
+			     SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+			     "xterm", data);
+	if(err){
+		printk(KERN_ERR "Failed to get IRQ for xterm, err = %d\n", 
+		       err);
+		return(err);
+	}
+	down(&data->sem);
+
+	free_irq(XTERM_IRQ, data);
+
+	ret = data->new_fd;
+	*pid_out = data->pid;
+	kfree(data);
+
+	return(ret);
+}
+
+/*
+ * 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:
+ */

arch/um/include/chan_user.h

@@ -13,6 +13,7 @@ struct chan_opts {
 	char *xterm_title;
 	int raw;
 	unsigned long tramp_stack;
+	int in_kernel;
 };
 
 enum chan_init_pri { INIT_STATIC, INIT_ALL, INIT_ONE };

arch/um/include/kern_util.h

@@ -6,6 +6,7 @@
 #ifndef __KERN_UTIL_H__
 #define __KERN_UTIL_H__
 
+#include "linux/threads.h"
 #include "sysdep/ptrace.h"
 
 extern int ncpus;
@@ -14,6 +15,7 @@ extern char *gdb_init;
 extern int kmalloc_ok;
 extern int timer_irq_inited;
 extern int jail;
+extern struct task_struct *idle_threads[NR_CPUS];
 
 #define ROUND_DOWN(addr) ((void *)(((unsigned long) addr) & PAGE_MASK))
 #define ROUND_UP(addr) ROUND_DOWN(((unsigned long) addr) + PAGE_SIZE - 1)

arch/um/kernel/Makefile

-
 EXTRA_TARGETS	:= unmap_fin.o
 
 obj-y = config.o exec_kern.o exec_user.o exitcode.o frame_kern.o frame.o \
@@ -51,6 +50,9 @@ arch/um/kernel/unmap.o: arch/um/kernel/unmap.c
 arch/um/kernel/unmap_fin.o : arch/um/kernel/unmap.o
 	ld -r -o $@ $< -lc -L/usr/lib
 
+# This has to be separate because it needs be compiled with frame pointers
+# regardless of how the rest of the kernel is built.
+
 arch/um/kernel/frame.o: arch/um/kernel/frame.c
 	$(CC) $(CFLAGS_$(notdir $@)) -c -o $@ $<
 

arch/um/kernel/irq_user.c

@@ -209,7 +209,6 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
 
  out_unlock:
 	irq_unlock(flags);
- out_free:
 	kfree(new_fd);
  out:
 	return(err);

arch/um/kernel/ksyms.c

+#include "linux/config.h"
 #include "linux/module.h"
 #include "linux/string.h"
+#include "linux/smp_lock.h"
+#include "linux/spinlock.h"
+#include <linux/highmem.h>
 #include "asm/current.h"
 #include "asm/delay.h"
 #include "asm/processor.h"
@@ -36,12 +40,15 @@ EXPORT_SYMBOL(page_mem_map);
 EXPORT_SYMBOL(get_signals);
 EXPORT_SYMBOL(page_to_phys);
 EXPORT_SYMBOL(phys_to_page);
+EXPORT_SYMBOL(high_physmem);
 
 EXPORT_SYMBOL(os_open_file);
 EXPORT_SYMBOL(os_read_file);
 EXPORT_SYMBOL(os_write_file);
 EXPORT_SYMBOL(os_seek_file);
 EXPORT_SYMBOL(os_pipe);
+EXPORT_SYMBOL(os_file_type);
+EXPORT_SYMBOL(os_close_file);
 EXPORT_SYMBOL(helper_wait);
 EXPORT_SYMBOL(os_shutdown_socket);
 EXPORT_SYMBOL(os_connect_socket);
@@ -58,3 +65,23 @@ EXPORT_SYMBOL(sys_lseek);
 EXPORT_SYMBOL(sys_read);
 EXPORT_SYMBOL(sys_wait4);
 
+#ifdef CONFIG_SMP
+
+/* required for SMP */
+
+extern void FASTCALL( __write_lock_failed(rwlock_t *rw));
+EXPORT_SYMBOL_NOVERS(__write_lock_failed);
+
+extern void FASTCALL( __read_lock_failed(rwlock_t *rw));
+EXPORT_SYMBOL_NOVERS(__read_lock_failed);
+
+#endif
+
+#ifdef CONFIG_HIGHMEM
+EXPORT_SYMBOL(kmap);
+EXPORT_SYMBOL(kunmap);
+EXPORT_SYMBOL(kmap_atomic);
+EXPORT_SYMBOL(kunmap_atomic);
+EXPORT_SYMBOL(kmap_atomic_to_page);
+#endif
+

arch/um/kernel/process_kern.c

@@ -767,8 +767,8 @@ void set_thread_sc(void *sc)
 
 int smp_sigio_handler(void)
 {
-	int cpu = current->thread_info->cpu;
 #ifdef CONFIG_SMP
+	int cpu = current->thread_info->cpu;
 	IPI_handler(cpu);
 	if(cpu != 0)
 		return(1);

arch/um/kernel/reboot.c

 /* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
 
@@ -9,6 +9,20 @@
 #include "kern.h"
 #include "os.h"
 
+#ifdef CONFIG_SMP
+static void kill_idlers(int me)
+{
+	struct task_struct *p;
+	int i;
+
+	for(i = 0; i < sizeof(idle_threads)/sizeof(idle_threads[0]); i++){
+		p = idle_threads[i];
+		if((p != NULL) && (p->thread.extern_pid != me))
+			os_kill_process(p->thread.extern_pid);
+	}
+}
+#endif
+
 static void kill_off_processes(void)
 {
 	struct task_struct *p;
@@ -21,6 +35,9 @@ static void kill_off_processes(void)
 	}
 	if(init_task.thread.extern_pid != me) 
 		os_kill_process(init_task.thread.extern_pid);
+#ifdef CONFIG_SMP
+	kill_idlers(me);
+#endif
 }
 
 void uml_cleanup(void)

arch/um/kernel/signal_user.c

@@ -84,13 +84,13 @@ void unblock_signals(void)
 #define SIGIO_BIT 0
 #define SIGVTALRM_BIT 1
 
-static int disable_mask(sigset_t *mask)
+static int enable_mask(sigset_t *mask)
 {
 	int sigs;
 
-	sigs = sigismember(mask, SIGIO) ? 1 << SIGIO_BIT : 0;
-	sigs |= sigismember(mask, SIGVTALRM) ? 1 << SIGVTALRM_BIT : 0;
-	sigs |= sigismember(mask, SIGALRM) ? 1 << SIGVTALRM_BIT : 0;
+	sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
+	sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
+	sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
 	return(sigs);
 }
 
@@ -100,30 +100,28 @@ int get_signals(void)
 	
 	if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
 		panic("Failed to get signal mask");
-	return(disable_mask(&mask));
+	return(enable_mask(&mask));
 }
 
-int set_signals(int disable)
+int set_signals(int enable)
 {
 	sigset_t mask;
 	int ret;
 
 	sigemptyset(&mask);
-	if(!(disable & (1 << SIGIO_BIT)))
+	if(enable & (1 << SIGIO_BIT)) 
 		sigaddset(&mask, SIGIO);
-	if(!(disable & (1 << SIGVTALRM_BIT))){
+	if(enable & (1 << SIGVTALRM_BIT)){
 		sigaddset(&mask, SIGVTALRM);
 		sigaddset(&mask, SIGALRM);
 	}
 	if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
 		panic("Failed to enable signals");
-
-	ret = disable_mask(&mask);
-
+	ret = enable_mask(&mask);
 	sigemptyset(&mask);
-	if(disable & (1 << SIGIO_BIT))
+	if((enable & (1 << SIGIO_BIT)) == 0) 
 		sigaddset(&mask, SIGIO);
-	if(disable & (1 << SIGVTALRM_BIT)){
+	if((enable & (1 << SIGVTALRM_BIT)) == 0){
 		sigaddset(&mask, SIGVTALRM);
 		sigaddset(&mask, SIGALRM);
 	}

arch/um/kernel/smp.c

@@ -47,6 +47,9 @@ int num_reschedules_sent = 0;
 /* Small, random number, never changed */
 unsigned long cache_decay_ticks = 5;
 
+/* Not changed after boot */
+struct task_struct *idle_threads[NR_CPUS];
+
 void smp_send_reschedule(int cpu)
 {
 	write(cpu_data[cpu].ipi_pipe[1], "R", 1);
@@ -142,6 +145,7 @@ static struct task_struct *idle_thread(int cpu)
 	cpu_tasks[cpu] = ((struct cpu_task) 
 		          { .pid = 	new_task->thread.extern_pid,
 			    .task = 	new_task } );
+	idle_threads[cpu] = new_task;
 	write(new_task->thread.switch_pipe[1], &c, sizeof(c));
 	return(new_task);
 }

arch/um/kernel/sys_call_table.c

@@ -229,6 +229,10 @@ extern syscall_handler_t sys_io_getevents;
 extern syscall_handler_t sys_io_submit;
 extern syscall_handler_t sys_io_cancel;
 extern syscall_handler_t sys_exit_group;
+extern syscall_handler_t sys_lookup_dcookie;
+extern syscall_handler_t sys_epoll_create;
+extern syscall_handler_t sys_epoll_ctl;
+extern syscall_handler_t sys_epoll_wait;
 
 #if CONFIG_NFSD
 #define NFSSERVCTL sys_nfsserctl
@@ -240,7 +244,7 @@ extern syscall_handler_t um_mount;
 extern syscall_handler_t um_time;
 extern syscall_handler_t um_stime;
 
-#define LAST_GENERIC_SYSCALL __NR_exit_group
+#define LAST_GENERIC_SYSCALL __NR_sys_epoll_wait
 
 #if LAST_GENERIC_SYSCALL > LAST_ARCH_SYSCALL
 #define LAST_SYSCALL LAST_GENERIC_SYSCALL
@@ -479,6 +483,10 @@ syscall_handler_t *sys_call_table[] = {
 	[ __NR_alloc_hugepages ] = sys_ni_syscall,
 	[ __NR_free_hugepages ] = sys_ni_syscall,
 	[ __NR_exit_group ] = sys_exit_group,
+	[ __NR_lookup_dcookie ] = sys_lookup_dcookie,
+	[ __NR_sys_epoll_create ] = sys_epoll_create,
+	[ __NR_sys_epoll_ctl ] = sys_epoll_ctl,
+	[ __NR_sys_epoll_wait ] = sys_epoll_wait,
 
 	ARCH_SYSCALLS
 	[ LAST_SYSCALL + 1 ... NR_syscalls ] = 

arch/um/kernel/sysrq.c

@@ -76,6 +76,16 @@ void show_trace(unsigned long * stack)
         printk("\n");
 }
 
+/*
+ * The architecture-independent dump_stack generator
+ */
+void dump_stack(void)
+{
+	unsigned long stack;
+
+	show_trace(&stack);
+}
+
 void show_trace_task(struct task_struct *tsk)
 {
 	unsigned long esp = PT_REGS_SP(&tsk->thread.regs);

arch/um/kernel/trap_kern.c

@@ -211,6 +211,7 @@ static struct chan_opts opts = {
 	xterm_title :	"UML kernel debugger",
 	raw :		0,
 	tramp_stack :	0,
+	in_kernel : 	0,
 };
 
 /* Accessed by the tracing thread, which automatically serializes access */

arch/um/os-Linux/Makefile

@@ -5,9 +5,11 @@
 
 obj-y = file.o process.o tty.o
 
+USER_OBJS := $(foreach file,$(obj-y),arch/um/os-Linux/$(file))
+
 include $(TOPDIR)/Rules.make
 
-$(obj-y) : %.o: %.c
+$(USER_OBJS) : %.o: %.c
 	$(CC) $(CFLAGS_$@) $(USER_CFLAGS) -c -o $@ $<
 
 clean :

arch/um/os-Linux/file.c

@@ -283,10 +283,9 @@ int os_rcv_fd(int fd, int *helper_pid_out)
 	msg.msg_flags = 0;
 
 	n = recvmsg(fd, &msg, 0);
-	if(n < 0){
-		printk("rcv_fd : recvmsg failed - errno = %d\n", errno);
-		return(-1);
-	}
+	if(n < 0)
+		return(-errno);
+
 	else if(n != sizeof(iov.iov_len))
 		*helper_pid_out = -1;
 

arch/um/sys-i386/Makefile

-obj-y = bugs.o checksum.o extable.o fault.o ksyms.o ldt.o old-checksum.o \
+obj-y = bugs.o checksum.o extable.o fault.o ksyms.o ldt.o \
 	ptrace.o ptrace_user.o semaphore.o sigcontext.o syscalls.o sysrq.o
 
+obj-$(CONFIG_HIGHMEM) += highmem.o
+
 export-objs = ksyms.o
 
 USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o
 USER_OBJS := $(foreach file,$(USER_OBJS),arch/um/sys-i386/$(file))
 
-SYMLINKS = semaphore.c old-checksum.c checksum.S extable.c
+SYMLINKS = semaphore.c checksum.S extable.c highmem.c
 
 include $(TOPDIR)/Rules.make
 
 $(USER_OBJS) : %.o: %.c
 	$(CC) $(CFLAGS_$@) $(USER_CFLAGS) -c -o $@ $<
 
-arch/um/sys-i386/checksum.S arch/um/sys-i386/old-checksum.c: 
+arch/um/sys-i386/checksum.S: 
 	-rm -f $@
 	-ln -s $(TOPDIR)/arch/i386/lib/$(notdir $@) $@
 
@@ -25,6 +27,9 @@ arch/um/sys-i386/extable.c:
 	-rm -f $@
 	-ln -s $(TOPDIR)/arch/i386/mm/$(notdir $@) $@
 
+arch/um/sys-i386/highmem.c:
+	-rm -f $@
+	-ln -s $(TOPDIR)/arch/i386/mm/$(notdir $@) $@
 clean:
 	$(MAKE) -C util clean
 

arch/um/uml.lds.S

@@ -65,7 +65,7 @@ SECTIONS
   .uml.postsetup.init : { *(.uml.postsetup.init) }
   __uml_postsetup_end = .;
   __setup_start = .;
-  .setup.init : { *(.setup.init) }
+  .init.setup : { *(.init.setup) }
   __setup_end = .;
   __per_cpu_start = . ; 
   .data.percpu : { *(.data.percpu) }

include/asm-um/irq.h

@@ -23,8 +23,9 @@ struct task_struct;
 #define WINCH_IRQ		10
 #define SIGIO_WRITE_IRQ 	11
 #define TELNETD_IRQ 		12
+#define XTERM_IRQ 		13
 
-#define LAST_IRQ TELNETD_IRQ
+#define LAST_IRQ XTERM_IRQ
 #define NR_IRQS (LAST_IRQ + 1)
 
 extern int um_request_irq(unsigned int irq, int fd, int type,

include/asm-um/system-generic.h

@@ -18,9 +18,9 @@
 extern void *switch_to(void *prev, void *next, void *last);
 
 extern int set_signals(int enable);
+extern int get_signals(void);
 extern void block_signals(void);
 extern void unblock_signals(void);
-extern int get_signals(void);
 
 #define local_save_flags(flags) do { (flags) = get_signals(); } while(0)
 #define local_irq_restore(flags) do { set_signals(flags); } while(0)
@@ -31,11 +31,11 @@ extern int get_signals(void);
 #define local_irq_enable() unblock_signals()
 #define local_irq_disable() block_signals()
 
-#define irqs_disabled()			\
-({					\
-	unsigned long flags;		\
-	local_save_flags(flags);	\
-	(flags != 0);			\
+#define irqs_disabled()                 \
+({                                      \
+        unsigned long flags;            \
+        local_save_flags(flags);        \
+        (flags == 0);                   \
 })
 
 #endif