Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

4 files changed, 26 insertions, 10 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 3da978eec79..8cdd3e72ba5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1315,9 +1315,8 @@ struct task_struct * __devinit fork_idle(int cpu)
 	struct pt_regs regs;
 
 	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL, 0);
-	if (!task)
-		return ERR_PTR(-ENOMEM);
-	init_idle(task, cpu);
+	if (!IS_ERR(task))
+		init_idle(task, cpu);
 
 	return task;
 }
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 42aa6f1a3f0..a681912bc89 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -231,10 +231,10 @@ fastcall unsigned int __do_IRQ(unsigned int irq)
 		spin_unlock(&desc->lock);
 
 		action_ret = handle_IRQ_event(irq, action);
-
-		spin_lock(&desc->lock);
 		if (!noirqdebug)
 			note_interrupt(irq, desc, action_ret);
+
+		spin_lock(&desc->lock);
 		if (likely(!(desc->status & IRQ_PENDING)))
 			break;
 		desc->status &= ~IRQ_PENDING;
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 9c7e2e4c1fe..543ea2e5ad9 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -147,11 +147,7 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
 	if (unlikely(irqfixup)) {
 		/* Don't punish working computers */
 		if ((irqfixup == 2 && irq == 0) || action_ret == IRQ_NONE) {
-			int ok;
-
-			spin_unlock(&desc->lock);
-			ok = misrouted_irq(irq);
-			spin_lock(&desc->lock);
+			int ok = misrouted_irq(irq);
 			if (action_ret == IRQ_NONE)
 				desc->irqs_unhandled -= ok;
 		}
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 476c3741511..2c6c2bf8551 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -293,6 +293,27 @@ void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
 }
 
 EXPORT_SYMBOL(_spin_lock_nested);
+unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	preempt_disable();
+	spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+	/*
+	 * On lockdep we dont want the hand-coded irq-enable of
+	 * _raw_spin_lock_flags() code, because lockdep assumes
+	 * that interrupts are not re-enabled during lock-acquire:
+	 */
+#ifdef CONFIG_PROVE_SPIN_LOCKING
+	_raw_spin_lock(lock);
+#else
+	_raw_spin_lock_flags(lock, &flags);
+#endif
+	return flags;
+}
+
+EXPORT_SYMBOL(_spin_lock_irqsave_nested);
 
 #endif