Merge commit '8700c95adb03' into timers/nohz

The full dynticks tree needs the latest RCU and sched
upstream updates in order to fix some dependencies.

Merge a common upstream merge point that has these
updates.

Conflicts:
	include/linux/perf_event.h
	kernel/rcutree.h
	kernel/rcutree_plugin.h

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

13 files changed, 56 insertions, 93 deletions

diff --git a/arch/um/drivers/chan.h b/arch/um/drivers/chan.h
index 78f1b899996..c512b0306dd 100644
--- a/arch/um/drivers/chan.h
+++ b/arch/um/drivers/chan.h
@@ -37,7 +37,7 @@ extern int console_write_chan(struct chan *chan, const char *buf,
 extern int console_open_chan(struct line *line, struct console *co);
 extern void deactivate_chan(struct chan *chan, int irq);
 extern void reactivate_chan(struct chan *chan, int irq);
-extern void chan_enable_winch(struct chan *chan, struct tty_struct *tty);
+extern void chan_enable_winch(struct chan *chan, struct tty_port *port);
 extern int enable_chan(struct line *line);
 extern void close_chan(struct line *line);
 extern int chan_window_size(struct line *line, 
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 15c553c239a..acbe6c67afb 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -122,10 +122,10 @@ static int open_chan(struct list_head *chans)
 	return err;
 }
 
-void chan_enable_winch(struct chan *chan, struct tty_struct *tty)
+void chan_enable_winch(struct chan *chan, struct tty_port *port)
 {
 	if (chan && chan->primary && chan->ops->winch)
-		register_winch(chan->fd, tty);
+		register_winch(chan->fd, port);
 }
 
 static void line_timer_cb(struct work_struct *work)
@@ -568,11 +568,7 @@ void chan_interrupt(struct line *line, int irq)
 		reactivate_fd(chan->fd, irq);
 	if (err == -EIO) {
 		if (chan->primary) {
-			struct tty_struct *tty = tty_port_tty_get(&line->port);
-			if (tty != NULL) {
-				tty_hangup(tty);
-				tty_kref_put(tty);
-			}
+			tty_port_tty_hangup(&line->port, false);
 			if (line->chan_out != chan)
 				close_one_chan(line->chan_out, 1);
 		}
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 9be670ad23b..3fd7c3efdb1 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -216,7 +216,7 @@ static int winch_thread(void *arg)
 	}
 }
 
-static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out,
+static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 		       unsigned long *stack_out)
 {
 	struct winch_data data;
@@ -271,7 +271,7 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out,
 	return err;
 }
 
-void register_winch(int fd, struct tty_struct *tty)
+void register_winch(int fd, struct tty_port *port)
 {
 	unsigned long stack;
 	int pid, thread, count, thread_fd = -1;
@@ -281,17 +281,17 @@ void register_winch(int fd, struct tty_struct *tty)
 		return;
 
 	pid = tcgetpgrp(fd);
-	if (is_skas_winch(pid, fd, tty)) {
-		register_winch_irq(-1, fd, -1, tty, 0);
+	if (is_skas_winch(pid, fd, port)) {
+		register_winch_irq(-1, fd, -1, port, 0);
 		return;
 	}
 
 	if (pid == -1) {
-		thread = winch_tramp(fd, tty, &thread_fd, &stack);
+		thread = winch_tramp(fd, port, &thread_fd, &stack);
 		if (thread < 0)
 			return;
 
-		register_winch_irq(thread_fd, fd, thread, tty, stack);
+		register_winch_irq(thread_fd, fd, thread, port, stack);
 
 		count = write(thread_fd, &c, sizeof(c));
 		if (count != sizeof(c))
diff --git a/arch/um/drivers/chan_user.h b/arch/um/drivers/chan_user.h
index dc693298eb8..03f1b565c5f 100644
--- a/arch/um/drivers/chan_user.h
+++ b/arch/um/drivers/chan_user.h
@@ -38,10 +38,10 @@ extern int generic_window_size(int fd, void *unused, unsigned short *rows_out,
 			       unsigned short *cols_out);
 extern void generic_free(void *data);
 
-struct tty_struct;
-extern void register_winch(int fd,  struct tty_struct *tty);
+struct tty_port;
+extern void register_winch(int fd,  struct tty_port *port);
 extern void register_winch_irq(int fd, int tty_fd, int pid,
-			       struct tty_struct *tty, unsigned long stack);
+			       struct tty_port *port, unsigned long stack);
 
 #define __channel_help(fn, prefix) \
 __uml_help(fn, prefix "[0-9]*=<channel description>\n" \
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index f1b38571f94..8035145f043 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -248,7 +248,6 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
 {
 	struct chan *chan = data;
 	struct line *line = chan->line;
-	struct tty_struct *tty;
 	int err;
 
 	/*
@@ -267,12 +266,7 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
 	}
 	spin_unlock(&line->lock);
 
-	tty = tty_port_tty_get(&line->port);
-	if (tty == NULL)
-		return IRQ_NONE;
-
-	tty_wakeup(tty);
-	tty_kref_put(tty);
+	tty_port_tty_wakeup(&line->port);
 
 	return IRQ_HANDLED;
 }
@@ -305,7 +299,7 @@ static int line_activate(struct tty_port *port, struct tty_struct *tty)
 		return ret;
 
 	if (!line->sigio) {
-		chan_enable_winch(line->chan_out, tty);
+		chan_enable_winch(line->chan_out, port);
 		line->sigio = 1;
 	}
 
@@ -315,8 +309,22 @@ static int line_activate(struct tty_port *port, struct tty_struct *tty)
 	return 0;
 }
 
+static void unregister_winch(struct tty_struct *tty);
+
+static void line_destruct(struct tty_port *port)
+{
+	struct tty_struct *tty = tty_port_tty_get(port);
+	struct line *line = tty->driver_data;
+
+	if (line->sigio) {
+		unregister_winch(tty);
+		line->sigio = 0;
+	}
+}
+
 static const struct tty_port_operations line_port_ops = {
 	.activate = line_activate,
+	.destruct = line_destruct,
 };
 
 int line_open(struct tty_struct *tty, struct file *filp)
@@ -340,18 +348,6 @@ int line_install(struct tty_driver *driver, struct tty_struct *tty,
 	return 0;
 }
 
-static void unregister_winch(struct tty_struct *tty);
-
-void line_cleanup(struct tty_struct *tty)
-{
-	struct line *line = tty->driver_data;
-
-	if (line->sigio) {
-		unregister_winch(tty);
-		line->sigio = 0;
-	}
-}
-
 void line_close(struct tty_struct *tty, struct file * filp)
 {
 	struct line *line = tty->driver_data;
@@ -601,7 +597,7 @@ struct winch {
 	int fd;
 	int tty_fd;
 	int pid;
-	struct tty_struct *tty;
+	struct tty_port *port;
 	unsigned long stack;
 	struct work_struct work;
 };
@@ -655,7 +651,7 @@ static irqreturn_t winch_interrupt(int irq, void *data)
 			goto out;
 		}
 	}
-	tty = winch->tty;
+	tty = tty_port_tty_get(winch->port);
 	if (tty != NULL) {
 		line = tty->driver_data;
 		if (line != NULL) {
@@ -663,6 +659,7 @@ static irqreturn_t winch_interrupt(int irq, void *data)
 					 &tty->winsize.ws_col);
 			kill_pgrp(tty->pgrp, SIGWINCH, 1);
 		}
+		tty_kref_put(tty);
 	}
  out:
 	if (winch->fd != -1)
@@ -670,7 +667,7 @@ static irqreturn_t winch_interrupt(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
+void register_winch_irq(int fd, int tty_fd, int pid, struct tty_port *port,
 			unsigned long stack)
 {
 	struct winch *winch;
@@ -685,7 +682,7 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty,
 				   .fd  	= fd,
 				   .tty_fd 	= tty_fd,
 				   .pid  	= pid,
-				   .tty 	= tty,
+				   .port 	= port,
 				   .stack	= stack });
 
 	if (um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
@@ -714,15 +711,18 @@ static void unregister_winch(struct tty_struct *tty)
 {
 	struct list_head *ele, *next;
 	struct winch *winch;
+	struct tty_struct *wtty;
 
 	spin_lock(&winch_handler_lock);
 
 	list_for_each_safe(ele, next, &winch_handlers) {
 		winch = list_entry(ele, struct winch, list);
-		if (winch->tty == tty) {
+		wtty = tty_port_tty_get(winch->port);
+		if (wtty == tty) {
 			free_winch(winch);
 			break;
 		}
+		tty_kref_put(wtty);
 	}
 	spin_unlock(&winch_handler_lock);
 }
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index d8926c30362..39f186252e0 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -218,6 +218,7 @@ static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	spin_lock_irqsave(&lp->lock, flags);
 
 	len = (*lp->write)(lp->fd, skb, lp);
+	skb_tx_timestamp(skb);
 
 	if (len == skb->len) {
 		dev->stats.tx_packets++;
@@ -281,6 +282,7 @@ static void uml_net_get_drvinfo(struct net_device *dev,
 static const struct ethtool_ops uml_net_ethtool_ops = {
 	.get_drvinfo	= uml_net_get_drvinfo,
 	.get_link	= ethtool_op_get_link,
+	.get_ts_info	= ethtool_op_get_ts_info,
 };
 
 static void uml_net_user_timer_expire(unsigned long _conn)
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index 16fdd0a0f9d..b8d14fa5205 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -105,7 +105,6 @@ static const struct tty_operations ssl_ops = {
 	.throttle 		= line_throttle,
 	.unthrottle 		= line_unthrottle,
 	.install		= ssl_install,
-	.cleanup		= line_cleanup,
 	.hangup			= line_hangup,
 };
 
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 827777af3f6..7b361f36ca9 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -110,7 +110,6 @@ static const struct tty_operations console_ops = {
 	.set_termios 		= line_set_termios,
 	.throttle 		= line_throttle,
 	.unthrottle 		= line_unthrottle,
-	.cleanup		= line_cleanup,
 	.hangup			= line_hangup,
 };
 
diff --git a/arch/um/kernel/early_printk.c b/arch/um/kernel/early_printk.c
index 49480f09245..4a0800bc37b 100644
--- a/arch/um/kernel/early_printk.c
+++ b/arch/um/kernel/early_printk.c
@@ -16,7 +16,7 @@ static void early_console_write(struct console *con, const char *s, unsigned int
 	um_early_printk(s, n);
 }
 
-static struct console early_console = {
+static struct console early_console_dev = {
 	.name = "earlycon",
 	.write = early_console_write,
 	.flags = CON_BOOT,
@@ -25,8 +25,10 @@ static struct console early_console = {
 
 static int __init setup_early_printk(char *buf)
 {
-	register_console(&early_console);
-
+	if (!early_console) {
+		early_console = &early_console_dev;
+		register_console(&early_console_dev);
+	}
 	return 0;
 }
 
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 5abcbfbe7e2..9df292b270a 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -42,17 +42,12 @@ static unsigned long brk_end;
 static void setup_highmem(unsigned long highmem_start,
 			  unsigned long highmem_len)
 {
-	struct page *page;
 	unsigned long highmem_pfn;
 	int i;
 
 	highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
-	for (i = 0; i < highmem_len >> PAGE_SHIFT; i++) {
-		page = &mem_map[highmem_pfn + i];
-		ClearPageReserved(page);
-		init_page_count(page);
-		__free_page(page);
-	}
+	for (i = 0; i < highmem_len >> PAGE_SHIFT; i++)
+		free_highmem_page(&mem_map[highmem_pfn + i]);
 }
 #endif
 
@@ -73,18 +68,13 @@ void __init mem_init(void)
 	totalram_pages = free_all_bootmem();
 	max_low_pfn = totalram_pages;
 #ifdef CONFIG_HIGHMEM
-	totalhigh_pages = highmem >> PAGE_SHIFT;
-	totalram_pages += totalhigh_pages;
+	setup_highmem(end_iomem, highmem);
 #endif
 	num_physpages = totalram_pages;
 	max_pfn = totalram_pages;
 	printk(KERN_INFO "Memory: %luk available\n",
 	       nr_free_pages() << (PAGE_SHIFT-10));
 	kmalloc_ok = 1;
-
-#ifdef CONFIG_HIGHMEM
-	setup_highmem(end_iomem, highmem);
-#endif
 }
 
 /*
@@ -254,15 +244,7 @@ void free_initmem(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	if (start < end)
-		printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
-		       (end - start) >> 10);
-	for (; start < end; start += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(start));
-		init_page_count(virt_to_page(start));
-		free_page(start);
-		totalram_pages++;
-	}
+	free_reserved_area(start, end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index b462b13c5ba..bbcef522bcb 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -210,33 +210,14 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
 	kmalloc_ok = save_kmalloc_ok;
 }
 
-void default_idle(void)
+void arch_cpu_idle(void)
 {
 	unsigned long long nsecs;
 
-	while (1) {
-		/* endless idle loop with no priority at all */
-
-		/*
-		 * although we are an idle CPU, we do not want to
-		 * get into the scheduler unnecessarily.
-		 */
-		if (need_resched())
-			schedule();
-
-		tick_nohz_idle_enter();
-		rcu_idle_enter();
-		nsecs = disable_timer();
-		idle_sleep(nsecs);
-		rcu_idle_exit();
-		tick_nohz_idle_exit();
-	}
-}
-
-void cpu_idle(void)
-{
 	cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
-	default_idle();
+	nsecs = disable_timer();
+	idle_sleep(nsecs);
+	local_irq_enable();
 }
 
 int __cant_sleep(void) {
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index b1469fe9329..9d9f1b4bf82 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -15,7 +15,7 @@
 #include <sysdep/mcontext.h>
 #include "internal.h"
 
-void (*sig_info[NSIG])(int, siginfo_t *, struct uml_pt_regs *) = {
+void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
 	[SIGTRAP]	= relay_signal,
 	[SIGFPE]	= relay_signal,
 	[SIGILL]	= relay_signal,
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index da4b9e9999f..337518c5042 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -15,6 +15,8 @@
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
 #include <asm/unistd.h>
 #include <init.h>
 #include <os.h>