Manual merge with Linus.

Conflicts:
	arch/powerpc/kernel/setup-common.c
	drivers/input/keyboard/hil_kbd.c
	drivers/input/mouse/hil_ptr.c

9 files changed, 200 insertions, 106 deletions

diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
index a61b7b46bc0..53d09ed78b4 100644
--- a/arch/um/drivers/daemon_kern.c
+++ b/arch/um/drivers/daemon_kern.c
@@ -95,18 +95,7 @@ static struct transport daemon_transport = {
 static int register_daemon(void)
 {
 	register_transport(&daemon_transport);
-	return(1);
+	return 0;
 }
 
 __initcall(register_daemon);
-
-/*
- * 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/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index 49acb2badf3..d18a974735e 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/arch/um/drivers/harddog_kern.c
@@ -104,7 +104,7 @@ static int harddog_release(struct inode *inode, struct file *file)
 
 extern int ping_watchdog(int fd);
 
-static ssize_t harddog_write(struct file *file, const char *data, size_t len,
+static ssize_t harddog_write(struct file *file, const char __user *data, size_t len,
 			     loff_t *ppos)
 {
 	/*
@@ -118,6 +118,7 @@ static ssize_t harddog_write(struct file *file, const char *data, size_t len,
 static int harddog_ioctl(struct inode *inode, struct file *file,
 			 unsigned int cmd, unsigned long arg)
 {
+	void __user *argp= (void __user *)arg;
 	static struct watchdog_info ident = {
 		WDIOC_SETTIMEOUT,
 		0,
@@ -127,13 +128,12 @@ static int harddog_ioctl(struct inode *inode, struct file *file,
 		default:
 			return -ENOTTY;
 		case WDIOC_GETSUPPORT:
-			if(copy_to_user((struct harddog_info *)arg, &ident,
-					sizeof(ident)))
+			if(copy_to_user(argp, &ident, sizeof(ident)))
 				return -EFAULT;
 			return 0;
 		case WDIOC_GETSTATUS:
 		case WDIOC_GETBOOTSTATUS:
-			return put_user(0,(int *)arg);
+			return put_user(0,(int __user *)argp);
 		case WDIOC_KEEPALIVE:
 			return(ping_watchdog(harddog_out_fd));
 	}
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
index 59602b81b24..37232f908cd 100644
--- a/arch/um/drivers/hostaudio_kern.c
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -67,8 +67,8 @@ MODULE_PARM_DESC(mixer, MIXER_HELP);
 
 /* /dev/dsp file operations */
 
-static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, 
-			      loff_t *ppos)
+static ssize_t hostaudio_read(struct file *file, char __user *buffer,
+			      size_t count, loff_t *ppos)
 {
         struct hostaudio_state *state = file->private_data;
 	void *kbuf;
@@ -94,7 +94,7 @@ static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count,
 	return(err);
 }
 
-static ssize_t hostaudio_write(struct file *file, const char *buffer, 
+static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
 			       size_t count, loff_t *ppos)
 {
         struct hostaudio_state *state = file->private_data;
@@ -152,7 +152,7 @@ static int hostaudio_ioctl(struct inode *inode, struct file *file,
 	case SNDCTL_DSP_CHANNELS:
 	case SNDCTL_DSP_SUBDIVIDE:
 	case SNDCTL_DSP_SETFRAGMENT:
-		if(get_user(data, (int *) arg))
+		if(get_user(data, (int __user *) arg))
 			return(-EFAULT);
 		break;
 	default:
@@ -168,7 +168,7 @@ static int hostaudio_ioctl(struct inode *inode, struct file *file,
 	case SNDCTL_DSP_CHANNELS:
 	case SNDCTL_DSP_SUBDIVIDE:
 	case SNDCTL_DSP_SETFRAGMENT:
-		if(put_user(data, (int *) arg))
+		if(put_user(data, (int __user *) arg))
 			return(-EFAULT);
 		break;
 	default:
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
index c9b078fba03..3a7af18cf94 100644
--- a/arch/um/drivers/mcast_kern.c
+++ b/arch/um/drivers/mcast_kern.c
@@ -124,18 +124,7 @@ static struct transport mcast_transport = {
 static int register_mcast(void)
 {
 	register_transport(&mcast_transport);
-	return(1);
+	return 0;
 }
 
 __initcall(register_mcast);
-
-/*
- * 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/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 54388d10bcf..28e3760e8b9 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -20,6 +20,8 @@
 #include "linux/namei.h"
 #include "linux/proc_fs.h"
 #include "linux/syscalls.h"
+#include "linux/list.h"
+#include "linux/mm.h"
 #include "linux/console.h"
 #include "asm/irq.h"
 #include "asm/uaccess.h"
@@ -347,6 +349,142 @@ static struct mc_device *mconsole_find_dev(char *name)
 	return(NULL);
 }
 
+#define UNPLUGGED_PER_PAGE \
+	((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long))
+
+struct unplugged_pages {
+	struct list_head list;
+	void *pages[UNPLUGGED_PER_PAGE];
+};
+
+static unsigned long long unplugged_pages_count = 0;
+static struct list_head unplugged_pages = LIST_HEAD_INIT(unplugged_pages);
+static int unplug_index = UNPLUGGED_PER_PAGE;
+
+static int mem_config(char *str)
+{
+	unsigned long long diff;
+	int err = -EINVAL, i, add;
+	char *ret;
+
+	if(str[0] != '=')
+		goto out;
+
+	str++;
+	if(str[0] == '-')
+		add = 0;
+	else if(str[0] == '+'){
+		add = 1;
+	}
+	else goto out;
+
+	str++;
+	diff = memparse(str, &ret);
+	if(*ret != '\0')
+		goto out;
+
+	diff /= PAGE_SIZE;
+
+	for(i = 0; i < diff; i++){
+		struct unplugged_pages *unplugged;
+		void *addr;
+
+		if(add){
+			if(list_empty(&unplugged_pages))
+				break;
+
+			unplugged = list_entry(unplugged_pages.next,
+					       struct unplugged_pages, list);
+			if(unplug_index > 0)
+				addr = unplugged->pages[--unplug_index];
+			else {
+				list_del(&unplugged->list);
+				addr = unplugged;
+				unplug_index = UNPLUGGED_PER_PAGE;
+			}
+
+			free_page((unsigned long) addr);
+			unplugged_pages_count--;
+		}
+		else {
+			struct page *page;
+
+			page = alloc_page(GFP_ATOMIC);
+			if(page == NULL)
+				break;
+
+			unplugged = page_address(page);
+			if(unplug_index == UNPLUGGED_PER_PAGE){
+				INIT_LIST_HEAD(&unplugged->list);
+				list_add(&unplugged->list, &unplugged_pages);
+				unplug_index = 0;
+			}
+			else {
+				struct list_head *entry = unplugged_pages.next;
+				addr = unplugged;
+
+				unplugged = list_entry(entry,
+						       struct unplugged_pages,
+						       list);
+				unplugged->pages[unplug_index++] = addr;
+				err = os_drop_memory(addr, PAGE_SIZE);
+				if(err)
+					printk("Failed to release memory - "
+					       "errno = %d\n", err);
+			}
+
+			unplugged_pages_count++;
+		}
+	}
+
+	err = 0;
+out:
+	return err;
+}
+
+static int mem_get_config(char *name, char *str, int size, char **error_out)
+{
+	char buf[sizeof("18446744073709551615")];
+	int len = 0;
+
+	sprintf(buf, "%ld", uml_physmem);
+	CONFIG_CHUNK(str, size, len, buf, 1);
+
+	return len;
+}
+
+static int mem_id(char **str, int *start_out, int *end_out)
+{
+	*start_out = 0;
+	*end_out = 0;
+
+	return 0;
+}
+
+static int mem_remove(int n)
+{
+	return -EBUSY;
+}
+
+static struct mc_device mem_mc = {
+	.name		= "mem",
+	.config		= mem_config,
+	.get_config	= mem_get_config,
+	.id		= mem_id,
+	.remove		= mem_remove,
+};
+
+static int mem_mc_init(void)
+{
+	if(can_drop_memory())
+		mconsole_register_dev(&mem_mc);
+	else printk("Can't release memory to the host - memory hotplug won't "
+		    "be supported\n");
+	return 0;
+}
+
+__initcall(mem_mc_init);
+
 #define CONFIG_BUF_SIZE 64
 
 static void mconsole_get_config(int (*get_config)(char *, char *, int,
@@ -478,7 +616,7 @@ static void console_write(struct console *console, const char *string,
 		return;
 
 	while(1){
-		n = min(len, ARRAY_SIZE(console_buf) - console_index);
+		n = min((size_t)len, ARRAY_SIZE(console_buf) - console_index);
 		strncpy(&console_buf[console_index], string, n);
 		console_index += n;
 		string += n;
@@ -762,7 +900,8 @@ static struct notifier_block panic_exit_notifier = {
 
 static int add_notifier(void)
 {
-	notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
+	atomic_notifier_chain_register(&panic_notifier_list,
+			&panic_exit_notifier);
 	return(0);
 }
 
diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
index 07c80f2156e..466ff2c2f91 100644
--- a/arch/um/drivers/pcap_kern.c
+++ b/arch/um/drivers/pcap_kern.c
@@ -106,18 +106,7 @@ static struct transport pcap_transport = {
 static int register_pcap(void)
 {
 	register_transport(&pcap_transport);
-	return(1);
+	return 0;
 }
 
 __initcall(register_pcap);
-
-/*
- * 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/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
index a62f5ef445c..163ee0d5f75 100644
--- a/arch/um/drivers/slip_kern.c
+++ b/arch/um/drivers/slip_kern.c
@@ -93,18 +93,7 @@ static struct transport slip_transport = {
 static int register_slip(void)
 {
 	register_transport(&slip_transport);
-	return(1);
+	return 0;
 }
 
 __initcall(register_slip);
-
-/*
- * 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/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
index 33d7982be5d..95e50c943e1 100644
--- a/arch/um/drivers/slirp_kern.c
+++ b/arch/um/drivers/slirp_kern.c
@@ -77,7 +77,7 @@ static int slirp_setup(char *str, char **mac_out, void *data)
 	int i=0;
 
 	*init = ((struct slirp_init)
-		{ argw :		{ { "slirp", NULL  } } });
+		{ .argw = { { "slirp", NULL  } } });
 
 	str = split_if_spec(str, mac_out, NULL);
 
@@ -116,18 +116,7 @@ static struct transport slirp_transport = {
 static int register_slirp(void)
 {
 	register_transport(&slirp_transport);
-	return(1);
+	return 0;
 }
 
 __initcall(register_slirp);
-
-/*
- * 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/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index fa617e0719a..0897852b09a 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -71,7 +71,7 @@ struct io_thread_req {
 	int error;
 };
 
-extern int open_ubd_file(char *file, struct openflags *openflags,
+extern int open_ubd_file(char *file, struct openflags *openflags, int shared,
 			 char **backing_file_out, int *bitmap_offset_out,
 			 unsigned long *bitmap_len_out, int *data_offset_out,
 			 int *create_cow_out);
@@ -137,7 +137,7 @@ static int fake_major = MAJOR_NR;
 
 static struct gendisk *ubd_gendisk[MAX_DEV];
 static struct gendisk *fake_gendisk[MAX_DEV];
- 
+
 #ifdef CONFIG_BLK_DEV_UBD_SYNC
 #define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
 					 .cl = 1 })
@@ -168,6 +168,7 @@ struct ubd {
 	__u64 size;
 	struct openflags boot_openflags;
 	struct openflags openflags;
+	int shared;
 	int no_cow;
 	struct cow cow;
 	struct platform_device pdev;
@@ -189,6 +190,7 @@ struct ubd {
 	.boot_openflags =	OPEN_FLAGS, \
 	.openflags =		OPEN_FLAGS, \
         .no_cow =               0, \
+	.shared =		0, \
         .cow =			DEFAULT_COW, \
 }
 
@@ -305,7 +307,7 @@ static int ubd_setup_common(char *str, int *index_out)
 		}
 		major = simple_strtoul(str, &end, 0);
 		if((*end != '\0') || (end == str)){
-			printk(KERN_ERR 
+			printk(KERN_ERR
 			       "ubd_setup : didn't parse major number\n");
 			return(1);
 		}
@@ -316,7 +318,7 @@ static int ubd_setup_common(char *str, int *index_out)
  			printk(KERN_ERR "Can't assign a fake major twice\n");
  			goto out1;
  		}
- 
+
  		fake_major = major;
 
 		printk(KERN_INFO "Setting extra ubd major number to %d\n",
@@ -351,7 +353,7 @@ static int ubd_setup_common(char *str, int *index_out)
 	if (index_out)
 		*index_out = n;
 
-	for (i = 0; i < 4; i++) {
+	for (i = 0; i < sizeof("rscd="); i++) {
 		switch (*str) {
 		case 'r':
 			flags.w = 0;
@@ -362,11 +364,14 @@ static int ubd_setup_common(char *str, int *index_out)
 		case 'd':
 			dev->no_cow = 1;
 			break;
+		case 'c':
+			dev->shared = 1;
+			break;
 		case '=':
 			str++;
 			goto break_loop;
 		default:
-			printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r,s or d)\n");
+			printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r, s, c, or d)\n");
 			goto out;
 		}
 		str++;
@@ -515,7 +520,7 @@ static void ubd_handler(void)
 		spin_unlock(&ubd_io_lock);
 		return;
 	}
-        
+
 	ubd_finish(rq, req.error);
 	reactivate_fd(thread_fd, UBD_IRQ);	
 	do_ubd_request(ubd_queue);
@@ -532,7 +537,7 @@ static int io_pid = -1;
 
 void kill_io_thread(void)
 {
-	if(io_pid != -1) 
+	if(io_pid != -1)
 		os_kill_process(io_pid, 1);
 }
 
@@ -567,14 +572,15 @@ static int ubd_open_dev(struct ubd *dev)
 	create_cow = 0;
 	create_ptr = (dev->cow.file != NULL) ? &create_cow : NULL;
 	back_ptr = dev->no_cow ? NULL : &dev->cow.file;
-	dev->fd = open_ubd_file(dev->file, &dev->openflags, back_ptr,
-				&dev->cow.bitmap_offset, &dev->cow.bitmap_len, 
-				&dev->cow.data_offset, create_ptr);
+	dev->fd = open_ubd_file(dev->file, &dev->openflags, dev->shared,
+				back_ptr, &dev->cow.bitmap_offset,
+				&dev->cow.bitmap_len, &dev->cow.data_offset,
+				create_ptr);
 
 	if((dev->fd == -ENOENT) && create_cow){
-		dev->fd = create_cow_file(dev->file, dev->cow.file, 
+		dev->fd = create_cow_file(dev->file, dev->cow.file,
 					  dev->openflags, 1 << 9, PAGE_SIZE,
-					  &dev->cow.bitmap_offset, 
+					  &dev->cow.bitmap_offset,
 					  &dev->cow.bitmap_len,
 					  &dev->cow.data_offset);
 		if(dev->fd >= 0){
@@ -598,16 +604,16 @@ static int ubd_open_dev(struct ubd *dev)
 		}
 		flush_tlb_kernel_vm();
 
-		err = read_cow_bitmap(dev->fd, dev->cow.bitmap, 
-				      dev->cow.bitmap_offset, 
+		err = read_cow_bitmap(dev->fd, dev->cow.bitmap,
+				      dev->cow.bitmap_offset,
 				      dev->cow.bitmap_len);
 		if(err < 0)
 			goto error;
 
 		flags = dev->openflags;
 		flags.w = 0;
-		err = open_ubd_file(dev->cow.file, &flags, NULL, NULL, NULL, 
-				    NULL, NULL);
+		err = open_ubd_file(dev->cow.file, &flags, dev->shared, NULL,
+				    NULL, NULL, NULL, NULL);
 		if(err < 0) goto error;
 		dev->cow.fd = err;
 	}
@@ -685,11 +691,11 @@ static int ubd_add(int n)
 	dev->size = ROUND_BLOCK(dev->size);
 
 	err = ubd_new_disk(MAJOR_NR, dev->size, n, &ubd_gendisk[n]);
-	if(err) 
+	if(err)
 		goto out_close;
- 
+
 	if(fake_major != MAJOR_NR)
-		ubd_new_disk(fake_major, dev->size, n, 
+		ubd_new_disk(fake_major, dev->size, n,
 			     &fake_gendisk[n]);
 
 	/* perhaps this should also be under the "if (fake_major)" above */
@@ -854,7 +860,7 @@ int ubd_init(void)
 			return -1;
 	}
 	platform_driver_register(&ubd_driver);
-	for (i = 0; i < MAX_DEV; i++) 
+	for (i = 0; i < MAX_DEV; i++)
 		ubd_add(i);
 	return 0;
 }
@@ -872,20 +878,20 @@ int ubd_driver_init(void){
 		 * enough. So use anyway the io thread. */
 	}
 	stack = alloc_stack(0, 0);
-	io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), 
+	io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *),
 				 &thread_fd);
 	if(io_pid < 0){
-		printk(KERN_ERR 
+		printk(KERN_ERR
 		       "ubd : Failed to start I/O thread (errno = %d) - "
 		       "falling back to synchronous I/O\n", -io_pid);
 		io_pid = -1;
 		return(0);
 	}
-	err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, 
+	err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr,
 			     SA_INTERRUPT, "ubd", ubd_dev);
 	if(err != 0)
 		printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
-	return(err);
+	return 0;
 }
 
 device_initcall(ubd_driver_init);
@@ -978,7 +984,7 @@ static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
 	if(req->op == UBD_READ) {
 		for(i = 0; i < req->length >> 9; i++){
 			if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
-				ubd_set_bit(i, (unsigned char *) 
+				ubd_set_bit(i, (unsigned char *)
 					    &req->sector_mask);
                 }
 	}
@@ -999,7 +1005,7 @@ static int prepare_request(struct request *req, struct io_thread_req *io_req)
 
 	/* This should be impossible now */
 	if((rq_data_dir(req) == WRITE) && !dev->openflags.w){
-		printk("Write attempted on readonly ubd device %s\n", 
+		printk("Write attempted on readonly ubd device %s\n",
 		       disk->disk_name);
 		end_request(req, 0);
 		return(1);
@@ -1182,7 +1188,7 @@ int read_cow_bitmap(int fd, void *buf, int offset, int len)
 	return(0);
 }
 
-int open_ubd_file(char *file, struct openflags *openflags,
+int open_ubd_file(char *file, struct openflags *openflags, int shared,
 		  char **backing_file_out, int *bitmap_offset_out,
 		  unsigned long *bitmap_len_out, int *data_offset_out,
 		  int *create_cow_out)
@@ -1206,10 +1212,14 @@ int open_ubd_file(char *file, struct openflags *openflags,
 			return fd;
         }
 
-	err = os_lock_file(fd, openflags->w);
-	if(err < 0){
-		printk("Failed to lock '%s', err = %d\n", file, -err);
-		goto out_close;
+	if(shared)
+		printk("Not locking \"%s\" on the host\n", file);
+	else {
+		err = os_lock_file(fd, openflags->w);
+		if(err < 0){
+			printk("Failed to lock '%s', err = %d\n", file, -err);
+			goto out_close;
+		}
 	}
 
 	/* Succesful return case! */
@@ -1260,7 +1270,7 @@ int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
 	int err, fd;
 
 	flags.c = 1;
-	fd = open_ubd_file(cow_file, &flags, NULL, NULL, NULL, NULL, NULL);
+	fd = open_ubd_file(cow_file, &flags, 0, NULL, NULL, NULL, NULL, NULL);
 	if(fd < 0){
 		err = fd;
 		printk("Open of COW file '%s' failed, errno = %d\n", cow_file,