Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / irq / dummychip.c

diff --git a/kernel/kernel/irq/dummychip.c b/kernel/kernel/irq/dummychip.c
new file mode 100644 (file)
index 0000000..2feb6fe
--- /dev/null
+++ b/kernel/kernel/irq/dummychip.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
+ *
+ * This file contains the dummy interrupt chip implementation
+ */
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/export.h>
+
+#include "internals.h"
+
+/*
+ * What should we do if we get a hw irq event on an illegal vector?
+ * Each architecture has to answer this themself.
+ */
+static void ack_bad(struct irq_data *data)
+{
+       struct irq_desc *desc = irq_data_to_desc(data);
+
+       print_irq_desc(data->irq, desc);
+       ack_bad_irq(data->irq);
+}
+
+/*
+ * NOP functions
+ */
+static void noop(struct irq_data *data) { }
+
+static unsigned int noop_ret(struct irq_data *data)
+{
+       return 0;
+}
+
+/*
+ * Generic no controller implementation
+ */
+struct irq_chip no_irq_chip = {
+       .name           = "none",
+       .irq_startup    = noop_ret,
+       .irq_shutdown   = noop,
+       .irq_enable     = noop,
+       .irq_disable    = noop,
+       .irq_ack        = ack_bad,
+};
+
+/*
+ * Generic dummy implementation which can be used for
+ * real dumb interrupt sources
+ */
+struct irq_chip dummy_irq_chip = {
+       .name           = "dummy",
+       .irq_startup    = noop_ret,
+       .irq_shutdown   = noop,
+       .irq_enable     = noop,
+       .irq_disable    = noop,
+       .irq_ack        = noop,
+       .irq_mask       = noop,
+       .irq_unmask     = noop,
+       .flags          = IRQCHIP_SKIP_SET_WAKE,
+};
+EXPORT_SYMBOL_GPL(dummy_irq_chip);