9 files changed, 57 insertions, 213 deletions

diff --git a/arch/mn10300/kernel/cevt-mn10300.c b/arch/mn10300/kernel/cevt-mn10300.c
index ccce35e3e17..60f64ca1752 100644
--- a/arch/mn10300/kernel/cevt-mn10300.c
+++ b/arch/mn10300/kernel/cevt-mn10300.c
@@ -113,7 +113,7 @@ int __init init_clockevents(void)
 	cd->set_next_event	= next_event;
 
 	iact = &per_cpu(timer_irq, cpu);
-	iact->flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER;
+	iact->flags = IRQF_SHARED | IRQF_TIMER;
 	iact->handler = timer_interrupt;
 
 	clockevents_register_device(cd);
diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S
index 68fcab8f8f6..177d61de51c 100644
--- a/arch/mn10300/kernel/entry.S
+++ b/arch/mn10300/kernel/entry.S
@@ -60,6 +60,7 @@ ENTRY(ret_from_kernel_thread)
 	mov	(REG_D0,fp),d0
 	mov	(REG_A0,fp),a0
 	calls	(a0)
+	GET_THREAD_INFO a2		# A2 must be set on return from sys_exit()
 	clr	d0
 	mov	d0,(REG_D0,fp)
 	jmp	syscall_exit
@@ -107,10 +108,10 @@ syscall_exit_work:
 	and	EPSW_nSL,d0
 	beq	resume_kernel		# returning to supervisor mode
 
-	btst	_TIF_SYSCALL_TRACE,d2
-	beq	work_pending
 	LOCAL_IRQ_ENABLE		# could let syscall_trace_exit() call
 					# schedule() instead
+	btst	_TIF_SYSCALL_TRACE,d2
+	beq	work_pending
 	mov	fp,d0
 	call	syscall_trace_exit[],0	# do_syscall_trace(regs)
 	jmp	resume_userspace
@@ -123,6 +124,7 @@ work_pending:
 work_resched:
 	call	schedule[],0
 
+resume_userspace:
 	# make sure we don't miss an interrupt setting need_resched or
 	# sigpending between sampling and the rti
 	LOCAL_IRQ_DISABLE
@@ -131,6 +133,8 @@ work_resched:
 	mov	(TI_flags,a2),d2
 	btst	_TIF_WORK_MASK,d2
 	beq	restore_all
+
+	LOCAL_IRQ_ENABLE
 	btst	_TIF_NEED_RESCHED,d2
 	bne	work_resched
 
@@ -167,21 +171,10 @@ ret_from_intr:
 	mov	(REG_EPSW,fp),d0	# need to deliver signals before
 					# returning to userspace
 	and	EPSW_nSL,d0
-	beq	resume_kernel		# returning to supervisor mode
-
-ENTRY(resume_userspace)
-	# make sure we don't miss an interrupt setting need_resched or
-	# sigpending between sampling and the rti
-	LOCAL_IRQ_DISABLE
-
-	# is there any work to be done on int/exception return?
-	mov	(TI_flags,a2),d2
-	btst	_TIF_WORK_MASK,d2
-	bne	work_pending
-	jmp	restore_all
+	bne	resume_userspace	# returning to userspace
 
 #ifdef CONFIG_PREEMPT
-ENTRY(resume_kernel)
+resume_kernel:
 	LOCAL_IRQ_DISABLE
 	mov	(TI_preempt_count,a2),d0	# non-zero preempt_count ?
 	cmp	0,d0
@@ -196,6 +189,8 @@ need_resched:
 	bne	restore_all
 	call	preempt_schedule_irq[],0
 	jmp	need_resched
+#else
+	jmp	resume_kernel
 #endif
 
 
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 81d5cb9b656..7ecf69879e2 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -524,7 +524,7 @@ static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
 static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
 {
 	struct uart_icount *icount = &port->uart.icount;
-	struct tty_struct *tty = port->uart.state->port.tty;
+	struct tty_port *tport = &port->uart.state->port;
 	unsigned ix;
 	int count;
 	u8 st, ch, push, status, overrun;
@@ -534,10 +534,10 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
 	push = 0;
 
 	count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
-	count = tty_buffer_request_room(tty, count);
+	count = tty_buffer_request_room(tport, count);
 	if (count == 0) {
-		if (!tty->low_latency)
-			tty_flip_buffer_push(tty);
+		if (!tport->low_latency)
+			tty_flip_buffer_push(tport);
 		return;
 	}
 
@@ -545,8 +545,8 @@ try_again:
 	/* pull chars out of the hat */
 	ix = ACCESS_ONCE(port->rx_outp);
 	if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) {
-		if (push && !tty->low_latency)
-			tty_flip_buffer_push(tty);
+		if (push && !tport->low_latency)
+			tty_flip_buffer_push(tport);
 		return;
 	}
 
@@ -666,19 +666,19 @@ insert:
 		else
 			flag = TTY_NORMAL;
 
-		tty_insert_flip_char(tty, ch, flag);
+		tty_insert_flip_char(tport, ch, flag);
 	}
 
 	/* overrun is special, since it's reported immediately, and doesn't
 	 * affect the current character
 	 */
 	if (overrun)
-		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+		tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 
 	count--;
 	if (count <= 0) {
-		if (!tty->low_latency)
-			tty_flip_buffer_push(tty);
+		if (!tport->low_latency)
+			tty_flip_buffer_push(tport);
 		return;
 	}
 
@@ -985,17 +985,17 @@ static int mn10300_serial_startup(struct uart_port *_port)
 	irq_set_chip(port->tm_irq, &mn10300_serial_pic);
 
 	if (request_irq(port->rx_irq, mn10300_serial_interrupt,
-			IRQF_DISABLED | IRQF_NOBALANCING,
+			IRQF_NOBALANCING,
 			port->rx_name, port) < 0)
 		goto error;
 
 	if (request_irq(port->tx_irq, mn10300_serial_interrupt,
-			IRQF_DISABLED | IRQF_NOBALANCING,
+			IRQF_NOBALANCING,
 			port->tx_name, port) < 0)
 		goto error2;
 
 	if (request_irq(port->tm_irq, mn10300_serial_interrupt,
-			IRQF_DISABLED | IRQF_NOBALANCING,
+			IRQF_NOBALANCING,
 			port->tm_name, port) < 0)
 		goto error3;
 	mn10300_serial_mask_ack(port->tm_irq);
diff --git a/arch/mn10300/kernel/mn10300-watchdog.c b/arch/mn10300/kernel/mn10300-watchdog.c
index db64a7166c0..a2d8e6938d6 100644
--- a/arch/mn10300/kernel/mn10300-watchdog.c
+++ b/arch/mn10300/kernel/mn10300-watchdog.c
@@ -142,7 +142,7 @@ void watchdog_interrupt(struct pt_regs *regs, enum exception_code excep)
 	NMICR = NMICR_WDIF;
 
 	nmi_count(smp_processor_id())++;
-	kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
+	kstat_incr_irq_this_cpu(irq);
 
 	for_each_online_cpu(cpu) {
 
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index eb09f5a552f..3707da583d0 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -37,12 +37,6 @@
 #include "internal.h"
 
 /*
- * power management idle function, if any..
- */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
-
-/*
  * return saved PC of a blocked thread.
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
@@ -56,78 +50,19 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
-#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
-/*
- * we use this if we don't have any better idle routine
- */
-static void default_idle(void)
-{
-	local_irq_disable();
-	if (!need_resched())
-		safe_halt();
-	else
-		local_irq_enable();
-}
-
-#else /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU  */
 /*
  * On SMP it's slightly faster (but much more power-consuming!)
  * to poll the ->work.need_resched flag instead of waiting for the
  * cross-CPU IPI to arrive. Use this option with caution.
+ *
+ * tglx: No idea why this depends on HOTPLUG_CPU !?!
  */
-static inline void poll_idle(void)
-{
-	int oldval;
-
-	local_irq_enable();
-
-	/*
-	 * Deal with another CPU just having chosen a thread to
-	 * run here:
-	 */
-	oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
-
-	if (!oldval) {
-		set_thread_flag(TIF_POLLING_NRFLAG);
-		while (!need_resched())
-			cpu_relax();
-		clear_thread_flag(TIF_POLLING_NRFLAG);
-	} else {
-		set_need_resched();
-	}
-}
-#endif /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
-
-/*
- * the idle thread
- * - there's no useful work to be done, so just try to conserve power and have
- *   a low exit latency (ie sit in a loop waiting for somebody to say that
- *   they'd like to reschedule)
- */
-void cpu_idle(void)
+#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
+void arch_cpu_idle(void)
 {
-	/* endless idle loop with no priority at all */
-	for (;;) {
-		rcu_idle_enter();
-		while (!need_resched()) {
-			void (*idle)(void);
-
-			smp_rmb();
-			idle = pm_idle;
-			if (!idle) {
-#if defined(CONFIG_SMP) && !defined(CONFIG_HOTPLUG_CPU)
-				idle = poll_idle;
-#else  /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
-				idle = default_idle;
-#endif /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
-			}
-			idle();
-		}
-		rcu_idle_exit();
-
-		schedule_preempt_disabled();
-	}
+	safe_halt();
 }
+#endif
 
 void release_segments(struct mm_struct *mm)
 {
@@ -162,6 +97,7 @@ void machine_power_off(void)
 
 void show_regs(struct pt_regs *regs)
 {
+	show_regs_print_info(KERN_DEFAULT);
 }
 
 /*
diff --git a/arch/mn10300/kernel/setup.c b/arch/mn10300/kernel/setup.c
index 33c3bd1e5c6..2ad7f32fa12 100644
--- a/arch/mn10300/kernel/setup.c
+++ b/arch/mn10300/kernel/setup.c
@@ -35,9 +35,7 @@
 
 struct mn10300_cpuinfo boot_cpu_data;
 
-/* For PCI or other memory-mapped resources */
-unsigned long pci_mem_start = 0x18000000;
-
+static char __initdata cmd_line[COMMAND_LINE_SIZE];
 char redboot_command_line[COMMAND_LINE_SIZE] =
 	"console=ttyS0,115200 root=/dev/mtdblock3 rw";
 
@@ -74,45 +72,19 @@ static const char *const mn10300_cputypes[] = {
 };
 
 /*
- *
+ * Pick out the memory size.  We look for mem=size,
+ * where size is "size[KkMm]"
  */
-static void __init parse_mem_cmdline(char **cmdline_p)
+static int __init early_mem(char *p)
 {
-	char *from, *to, c;
-
-	/* save unparsed command line copy for /proc/cmdline */
-	strcpy(boot_command_line, redboot_command_line);
-
-	/* see if there's an explicit memory size option */
-	from = redboot_command_line;
-	to = redboot_command_line;
-	c = ' ';
-
-	for (;;) {
-		if (c == ' ' && !memcmp(from, "mem=", 4)) {
-			if (to != redboot_command_line)
-				to--;
-			memory_size = memparse(from + 4, &from);
-		}
-
-		c = *(from++);
-		if (!c)
-			break;
-
-		*(to++) = c;
-	}
-
-	*to = '\0';
-	*cmdline_p = redboot_command_line;
+	memory_size = memparse(p, &p);
 
 	if (memory_size == 0)
 		panic("Memory size not known\n");
 
-	memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
-		memory_size;
-	if (memory_end > phys_memory_end)
-		memory_end = phys_memory_end;
+	return 0;
 }
+early_param("mem", early_mem);
 
 /*
  * architecture specific setup
@@ -125,7 +97,20 @@ void __init setup_arch(char **cmdline_p)
 	cpu_init();
 	unit_setup();
 	smp_init_cpus();
-	parse_mem_cmdline(cmdline_p);
+
+	/* save unparsed command line copy for /proc/cmdline */
+	strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
+
+	/* populate cmd_line too for later use, preserving boot_command_line */
+	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+	*cmdline_p = cmd_line;
+
+	parse_early_param();
+
+	memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
+		memory_size;
+	if (memory_end > phys_memory_end)
+		memory_end = phys_memory_end;
 
 	init_mm.start_code = (unsigned long)&_text;
 	init_mm.end_code = (unsigned long) &_etext;
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index f570b3085ef..9dfac5cd16e 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -32,59 +32,6 @@
 #define DEBUG_SIG 0
 
 /*
- * atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
-{
-	sigset_t blocked;
-	siginitset(&blocked, mask);
-	return sigsuspend(&blocked);
-}
-
-/*
- * set signal action syscall
- */
-asmlinkage long sys_sigaction(int sig,
-			      const struct old_sigaction __user *act,
-			      struct old_sigaction __user *oact)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-
-	if (act) {
-		old_sigset_t mask;
-		if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
-		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
-		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
-		    __get_user(mask, &act->sa_mask))
-			return -EFAULT;
-		siginitset(&new_ka.sa.sa_mask, mask);
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
-		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
-		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
-		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
-			return -EFAULT;
-	}
-
-	return ret;
-}
-
-/*
- * set alternate signal stack syscall
- */
-asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
-{
-	return do_sigaltstack(uss, uoss, current_frame()->sp);
-}
-
-/*
  * do a signal return; undo the signal stack.
  */
 static int restore_sigcontext(struct pt_regs *regs,
@@ -193,8 +140,7 @@ asmlinkage long sys_rt_sigreturn(void)
 	if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
-	    -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return d0;
@@ -359,9 +305,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	/* create the ucontext.  */
 	if (__put_user(0, &frame->uc.uc_flags) ||
 	    __put_user(0, &frame->uc.uc_link) ||
-	    __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
-	    __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
-	    __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
+	    __save_altstack(&frame->uc.uc_stack, regs->sp) ||
 	    setup_sigcontext(&frame->uc.uc_mcontext,
 			     &frame->fpuctx, regs, set->sig[0]) ||
 	    __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
index 5d7e152a23b..f984193718b 100644
--- a/arch/mn10300/kernel/smp.c
+++ b/arch/mn10300/kernel/smp.c
@@ -143,7 +143,7 @@ static struct irqaction call_function_ipi = {
 static irqreturn_t smp_ipi_timer_interrupt(int irq, void *dev_id);
 static struct irqaction local_timer_ipi = {
 	.handler	= smp_ipi_timer_interrupt,
-	.flags		= IRQF_DISABLED | IRQF_NOBALANCING,
+	.flags		= IRQF_NOBALANCING,
 	.name		= "smp local timer IPI"
 };
 #endif
@@ -675,7 +675,7 @@ int __init start_secondary(void *unused)
 #ifdef CONFIG_GENERIC_CLOCKEVENTS
 	init_clockevents();
 #endif
-	cpu_idle();
+	cpu_startup_entry(CPUHP_ONLINE);
 	return 0;
 }
 
@@ -935,8 +935,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 	int timeout;
 
 #ifdef CONFIG_HOTPLUG_CPU
-	if (num_online_cpus() == 1)
-		disable_hlt();
 	if (sleep_mode[cpu])
 		run_wakeup_cpu(cpu);
 #endif /* CONFIG_HOTPLUG_CPU */
@@ -1003,9 +1001,6 @@ int __cpu_disable(void)
 void __cpu_die(unsigned int cpu)
 {
 	run_sleep_cpu(cpu);
-
-	if (num_online_cpus() == 1)
-		enable_hlt();
 }
 
 #ifdef CONFIG_MN10300_CACHE_ENABLED
diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c
index b900e5afa0a..a7a987c7954 100644
--- a/arch/mn10300/kernel/traps.c
+++ b/arch/mn10300/kernel/traps.c
@@ -294,17 +294,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
 }
 
 /*
- * the architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-	unsigned long stack;
-
-	show_stack(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
-
-/*
  * dump the register file in the specified exception frame
  */
 void show_registers_only(struct pt_regs *regs)