1 files changed, 90 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
new file mode 100644
index 00000000..e65d0663
--- /dev/null
+++ b/include/linux/rcutree.h
@@ -0,0 +1,90 @@
+/*
+ * Read-Copy Update mechanism for mutual exclusion (tree-based version)
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Author: Dipankar Sarma <dipankar@in.ibm.com>
+ *	   Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
+ *
+ * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
+ * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ *	Documentation/RCU
+ */
+
+#ifndef __LINUX_RCUTREE_H
+#define __LINUX_RCUTREE_H
+
+extern void rcu_init(void);
+extern void rcu_note_context_switch(int cpu);
+extern int rcu_needs_cpu(int cpu);
+extern void rcu_cpu_stall_reset(void);
+
+/*
+ * Note a virtualization-based context switch.  This is simply a
+ * wrapper around rcu_note_context_switch(), which allows TINY_RCU
+ * to save a few bytes.
+ */
+static inline void rcu_virt_note_context_switch(int cpu)
+{
+	rcu_note_context_switch(cpu);
+}
+
+#ifdef CONFIG_TREE_PREEMPT_RCU
+
+extern void exit_rcu(void);
+
+#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
+
+static inline void exit_rcu(void)
+{
+}
+
+#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
+
+extern void synchronize_rcu_bh(void);
+extern void synchronize_sched_expedited(void);
+extern void synchronize_rcu_expedited(void);
+
+static inline void synchronize_rcu_bh_expedited(void)
+{
+	synchronize_sched_expedited();
+}
+
+extern void rcu_barrier(void);
+
+extern unsigned long rcutorture_testseq;
+extern unsigned long rcutorture_vernum;
+extern long rcu_batches_completed(void);
+extern long rcu_batches_completed_bh(void);
+extern long rcu_batches_completed_sched(void);
+
+extern void rcu_force_quiescent_state(void);
+extern void rcu_bh_force_quiescent_state(void);
+extern void rcu_sched_force_quiescent_state(void);
+
+/* A context switch is a grace period for RCU-sched and RCU-bh. */
+static inline int rcu_blocking_is_gp(void)
+{
+	return num_online_cpus() == 1;
+}
+
+extern void rcu_scheduler_starting(void);
+extern int rcu_scheduler_active __read_mostly;
+
+#endif /* __LINUX_RCUTREE_H */