[patch, -rc5-mm1] lock validator: introduce irq_[disable/enable]_lockdep()

[Ingo Molnar <mingo@elte.hu>]

Subject: lock validator: introduce irq_[disable/enable]_lockdep()
From: Ingo Molnar <mingo@elte.hu>

Special lockdep variants of irq line disabling/enabling.

These should be used for locking constructs that
know that a particular irq context which is disabled,
and which is the only irq-context user of a lock,
that it's safe to take the lock in the irq-disabled
section without disabling hardirqs.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/interrupt.h |   35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

Index: linux/include/linux/interrupt.h
===================================================================
--- linux.orig/include/linux/interrupt.h
+++ linux/include/linux/interrupt.h
@@ -53,6 +53,41 @@ static inline int disable_irq_wake(unsig
 
 #endif
 
+/*
+ * Special lockdep variants of irq disabling/enabling.
+ * These should be used for locking constructs that
+ * know that a particular irq context which is disabled,
+ * and which is the only irq-context user of a lock,
+ * that it's safe to take the lock in the irq-disabled
+ * section without disabling hardirqs.
+ *
+ * On !CONFIG_LOCKDEP they are equivalent to the normal
+ * irq disable/enable methods.
+ */
+static void disable_irq_nosync_lockdep(unsigned int irq)
+{
+	disable_irq_nosync(irq);
+#ifdef CONFIG_LOCKDEP
+	local_irq_disable();
+#endif
+}
+
+static void disable_irq_lockdep(unsigned int irq)
+{
+	disable_irq(irq);
+#ifdef CONFIG_LOCKDEP
+	local_irq_disable();
+#endif
+}
+
+static void enable_irq_lockdep(unsigned int irq)
+{
+#ifdef CONFIG_LOCKDEP
+	local_irq_enable();
+#endif
+	enable_irq(irq);
+}
+
 #ifndef __ARCH_SET_SOFTIRQ_PENDING
 #define set_softirq_pending(x) (local_softirq_pending() = (x))
 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
-
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