3 files changed, 20 insertions, 10 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index dbcb11a31f7..b5bcebca1cd 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -271,7 +271,7 @@ ENTRY(sys_call_table)
 @ r8 = syscall table
 		.type	sys_syscall, #function
 sys_syscall:
-		eor	scno, r0, #__NR_OABI_SYSCALL_BASE
+		bic	scno, r0, #__NR_OABI_SYSCALL_BASE
 		cmp	scno, #__NR_syscall - __NR_SYSCALL_BASE
 		cmpne	scno, #NR_syscalls	@ check range
 		stmloia	sp, {r5, r6}		@ shuffle args
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 2d5896b3618..bcc19fbb32d 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -342,10 +342,10 @@ __do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
 
 #ifdef CONFIG_NO_IDLE_HZ
 	if (!(action->flags & SA_TIMER) && system_timer->dyn_tick != NULL) {
-		write_seqlock(&xtime_lock);
+		spin_lock(&system_timer->dyn_tick->lock);
 		if (system_timer->dyn_tick->state & DYN_TICK_ENABLED)
 			system_timer->dyn_tick->handler(irq, 0, regs);
-		write_sequnlock(&xtime_lock);
+		spin_unlock(&system_timer->dyn_tick->lock);
 	}
 #endif
 
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index d6bd435a685..9c12d4fefbd 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -379,7 +379,7 @@ static int timer_dyn_tick_enable(void)
 	int ret = -ENODEV;
 
 	if (dyn_tick) {
-		write_seqlock_irqsave(&xtime_lock, flags);
+		spin_lock_irqsave(&dyn_tick->lock, flags);
 		ret = 0;
 		if (!(dyn_tick->state & DYN_TICK_ENABLED)) {
 			ret = dyn_tick->enable();
@@ -387,7 +387,7 @@ static int timer_dyn_tick_enable(void)
 			if (ret == 0)
 				dyn_tick->state |= DYN_TICK_ENABLED;
 		}
-		write_sequnlock_irqrestore(&xtime_lock, flags);
+		spin_unlock_irqrestore(&dyn_tick->lock, flags);
 	}
 
 	return ret;
@@ -400,7 +400,7 @@ static int timer_dyn_tick_disable(void)
 	int ret = -ENODEV;
 
 	if (dyn_tick) {
-		write_seqlock_irqsave(&xtime_lock, flags);
+		spin_lock_irqsave(&dyn_tick->lock, flags);
 		ret = 0;
 		if (dyn_tick->state & DYN_TICK_ENABLED) {
 			ret = dyn_tick->disable();
@@ -408,7 +408,7 @@ static int timer_dyn_tick_disable(void)
 			if (ret == 0)
 				dyn_tick->state &= ~DYN_TICK_ENABLED;
 		}
-		write_sequnlock_irqrestore(&xtime_lock, flags);
+		spin_unlock_irqrestore(&dyn_tick->lock, flags);
 	}
 
 	return ret;
@@ -422,15 +422,20 @@ static int timer_dyn_tick_disable(void)
 void timer_dyn_reprogram(void)
 {
 	struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
-	unsigned long next, seq;
+	unsigned long next, seq, flags;
 
-	if (dyn_tick && (dyn_tick->state & DYN_TICK_ENABLED)) {
+	if (!dyn_tick)
+		return;
+
+	spin_lock_irqsave(&dyn_tick->lock, flags);
+	if (dyn_tick->state & DYN_TICK_ENABLED) {
 		next = next_timer_interrupt();
 		do {
 			seq = read_seqbegin(&xtime_lock);
-			dyn_tick->reprogram(next_timer_interrupt() - jiffies);
+			dyn_tick->reprogram(next - jiffies);
 		} while (read_seqretry(&xtime_lock, seq));
 	}
+	spin_unlock_irqrestore(&dyn_tick->lock, flags);
 }
 
 static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)
@@ -499,5 +504,10 @@ void __init time_init(void)
 	if (system_timer->offset == NULL)
 		system_timer->offset = dummy_gettimeoffset;
 	system_timer->init();
+
+#ifdef CONFIG_NO_IDLE_HZ
+	if (system_timer->dyn_tick)
+		system_timer->dyn_tick->lock = SPIN_LOCK_UNLOCKED;
+#endif
 }