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diff --git a/kernel/arch/ia64/include/asm/sn/nodepda.h b/kernel/arch/ia64/include/asm/sn/nodepda.h
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
+ */
+#ifndef _ASM_IA64_SN_NODEPDA_H
+#define _ASM_IA64_SN_NODEPDA_H
+
+
+#include <asm/irq.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/bte.h>
+
+/*
+ * NUMA Node-Specific Data structures are defined in this file.
+ * In particular, this is the location of the node PDA.
+ * A pointer to the right node PDA is saved in each CPU PDA.
+ */
+
+/*
+ * Node-specific data structure.
+ *
+ * One of these structures is allocated on each node of a NUMA system.
+ *
+ * This structure provides a convenient way of keeping together
+ * all per-node data structures.
+ */
+struct phys_cpuid {
+ short nasid;
+ char subnode;
+ char slice;
+};
+
+struct nodepda_s {
+ void *pdinfo; /* Platform-dependent per-node info */
+
+ /*
+ * The BTEs on this node are shared by the local cpus
+ */
+ struct bteinfo_s bte_if[MAX_BTES_PER_NODE]; /* Virtual Interface */
+ struct timer_list bte_recovery_timer;
+ spinlock_t bte_recovery_lock;
+
+ /*
+ * Array of pointers to the nodepdas for each node.
+ */
+ struct nodepda_s *pernode_pdaindr[MAX_COMPACT_NODES];
+
+ /*
+ * Array of physical cpu identifiers. Indexed by cpuid.
+ */
+ struct phys_cpuid phys_cpuid[NR_CPUS];
+ spinlock_t ptc_lock ____cacheline_aligned_in_smp;
+};
+
+typedef struct nodepda_s nodepda_t;
+
+/*
+ * Access Functions for node PDA.
+ * Since there is one nodepda for each node, we need a convenient mechanism
+ * to access these nodepdas without cluttering code with #ifdefs.
+ * The next set of definitions provides this.
+ * Routines are expected to use
+ *
+ * sn_nodepda - to access node PDA for the node on which code is running
+ * NODEPDA(cnodeid) - to access node PDA for cnodeid
+ */
+
+DECLARE_PER_CPU(struct nodepda_s *, __sn_nodepda);
+#define sn_nodepda __this_cpu_read(__sn_nodepda)
+#define NODEPDA(cnodeid) (sn_nodepda->pernode_pdaindr[cnodeid])
+
+/*
+ * Check if given a compact node id the corresponding node has all the
+ * cpus disabled.
+ */
+#define is_headless_node(cnodeid) (nr_cpus_node(cnodeid) == 0)
+
+#endif /* _ASM_IA64_SN_NODEPDA_H */