[patch 41/61] lock validator: special locking: genirq

[Ingo Molnar]

From: Ingo Molnar <mingo@xxxxxxx>

teach special (recursive) locking code to the lock validator. Has no
effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
---
 kernel/irq/handle.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Index: linux/kernel/irq/handle.c
===================================================================
--- linux.orig/kernel/irq/handle.c
+++ linux/kernel/irq/handle.c
@@ -11,6 +11,7 @@
 #include <linux/random.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
+#include <linux/kallsyms.h>
 
 #include "internals.h"
 
@@ -193,3 +194,15 @@ out:
 	return 1;
 }
 
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-type:
+ */
+static struct lockdep_type_key irq_desc_lock_type;
+
+void early_init_irq_lock_type(void)
+{
+	int i;
+
+	for (i = 0; i < NR_IRQS; i++)
+		spin_lock_init_key(&irq_desc[i].lock, &irq_desc_lock_type);
+}
-
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