1 files changed, 171 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
new file mode 100644
index 00000000..e93df771
--- /dev/null
+++ b/include/linux/rcutiny.h
@@ -0,0 +1,171 @@
+/*
+ * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
+ *
+ * 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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ *		Documentation/RCU
+ */
+#ifndef __LINUX_TINY_H
+#define __LINUX_TINY_H
+
+#include <linux/cache.h>
+
+static inline void rcu_init(void)
+{
+}
+
+static inline void rcu_barrier_bh(void)
+{
+	wait_rcu_gp(call_rcu_bh);
+}
+
+static inline void rcu_barrier_sched(void)
+{
+	wait_rcu_gp(call_rcu_sched);
+}
+
+#ifdef CONFIG_TINY_RCU
+
+static inline void synchronize_rcu_expedited(void)
+{
+	synchronize_sched();	/* Only one CPU, so pretty fast anyway!!! */
+}
+
+static inline void rcu_barrier(void)
+{
+	rcu_barrier_sched();  /* Only one CPU, so only one list of callbacks! */
+}
+
+#else /* #ifdef CONFIG_TINY_RCU */
+
+void synchronize_rcu_expedited(void);
+
+static inline void rcu_barrier(void)
+{
+	wait_rcu_gp(call_rcu);
+}
+
+#endif /* #else #ifdef CONFIG_TINY_RCU */
+
+static inline void synchronize_rcu_bh(void)
+{
+	synchronize_sched();
+}
+
+static inline void synchronize_rcu_bh_expedited(void)
+{
+	synchronize_sched();
+}
+
+static inline void synchronize_sched_expedited(void)
+{
+	synchronize_sched();
+}
+
+static inline void kfree_call_rcu(struct rcu_head *head,
+				  void (*func)(struct rcu_head *rcu))
+{
+	call_rcu(head, func);
+}
+
+#ifdef CONFIG_TINY_RCU
+
+static inline void rcu_preempt_note_context_switch(void)
+{
+}
+
+static inline void exit_rcu(void)
+{
+}
+
+static inline int rcu_needs_cpu(int cpu)
+{
+	return 0;
+}
+
+#else /* #ifdef CONFIG_TINY_RCU */
+
+void rcu_preempt_note_context_switch(void);
+extern void exit_rcu(void);
+int rcu_preempt_needs_cpu(void);
+
+static inline int rcu_needs_cpu(int cpu)
+{
+	return rcu_preempt_needs_cpu();
+}
+
+#endif /* #else #ifdef CONFIG_TINY_RCU */
+
+static inline void rcu_note_context_switch(int cpu)
+{
+	rcu_sched_qs(cpu);
+	rcu_preempt_note_context_switch();
+}
+
+/*
+ * Take advantage of the fact that there is only one CPU, which
+ * allows us to ignore virtualization-based context switches.
+ */
+static inline void rcu_virt_note_context_switch(int cpu)
+{
+}
+
+/*
+ * Return the number of grace periods.
+ */
+static inline long rcu_batches_completed(void)
+{
+	return 0;
+}
+
+/*
+ * Return the number of bottom-half grace periods.
+ */
+static inline long rcu_batches_completed_bh(void)
+{
+	return 0;
+}
+
+static inline void rcu_force_quiescent_state(void)
+{
+}
+
+static inline void rcu_bh_force_quiescent_state(void)
+{
+}
+
+static inline void rcu_sched_force_quiescent_state(void)
+{
+}
+
+static inline void rcu_cpu_stall_reset(void)
+{
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern int rcu_scheduler_active __read_mostly;
+extern void rcu_scheduler_starting(void);
+#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+static inline void rcu_scheduler_starting(void)
+{
+}
+#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+
+#endif /* __LINUX_RCUTINY_H */