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diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/hardirq.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/hardirq.h
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+++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/hardirq.h
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+/*
+ * arch/ubicom32/include/asm/hardirq.h
+ * Definition of ack_bad_irq() for Ubicom32 architecture.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ * Copyright (C) 1997, 98, 99, 2000, 01, 05 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2001 MIPS Technologies, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port. If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ * arch/m68knommu
+ * arch/blackfin
+ * arch/parisc
+ */
+#ifndef _ASM_UBICOM32_HARDIRQ_H
+#define _ASM_UBICOM32_HARDIRQ_H
+
+#include <linux/threads.h>
+#include <linux/irq.h>
+
+/*
+ * The hardirq mask has to be large enough to have space
+ * for potentially all IRQ sources in the system nesting
+ * on a single CPU. For Ubicom32, we have 64 IRQ sources.
+ */
+#define HARDIRQ_BITS 6
+#if (1 << HARDIRQ_BITS) < NR_IRQS
+# error HARDIRQ_BITS is too low!
+#endif
+
+typedef struct {
+ unsigned int __softirq_pending;
+} ____cacheline_aligned irq_cpustat_t;
+
+#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
+
+extern void ack_bad_irq(unsigned int irq);
+
+#endif /* _ASM_UBICOM32_HARDIRQ_H */