1 files changed, 78 insertions, 0 deletions
diff --git a/include/linux/rwlock_types.h b/include/linux/rwlock_types.h
new file mode 100644
index 000000000..1948442e7
--- /dev/null
+++ b/include/linux/rwlock_types.h
@@ -0,0 +1,78 @@
+#ifndef __LINUX_RWLOCK_TYPES_H
+#define __LINUX_RWLOCK_TYPES_H
+
+#if !defined(__LINUX_SPINLOCK_TYPES_H)
+# error "Do not include directly, include spinlock_types.h"
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define RW_DEP_MAP_INIT(lockname)					\
+	.dep_map = {							\
+		.name = #lockname,					\
+		.wait_type_inner = LD_WAIT_CONFIG,			\
+	}
+#else
+# define RW_DEP_MAP_INIT(lockname)
+#endif
+
+#ifndef CONFIG_PREEMPT_RT
+/*
+ * generic rwlock type definitions and initializers
+ *
+ * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
+ * Released under the General Public License (GPL).
+ */
+typedef struct {
+	arch_rwlock_t raw_lock;
+#ifdef CONFIG_DEBUG_SPINLOCK
+	unsigned int magic, owner_cpu;
+	void *owner;
+#endif
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map dep_map;
+#endif
+} rwlock_t;
+
+#define RWLOCK_MAGIC		0xdeaf1eed
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+#define __RW_LOCK_UNLOCKED(lockname)					\
+	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
+				.magic = RWLOCK_MAGIC,			\
+				.owner = SPINLOCK_OWNER_INIT,		\
+				.owner_cpu = -1,			\
+				RW_DEP_MAP_INIT(lockname) }
+#else
+#define __RW_LOCK_UNLOCKED(lockname) \
+	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
+				RW_DEP_MAP_INIT(lockname) }
+#endif
+
+#define DEFINE_RWLOCK(x)	rwlock_t x = __RW_LOCK_UNLOCKED(x)
+
+#else /* !CONFIG_PREEMPT_RT */
+
+#include <linux/rwbase_rt.h>
+
+typedef struct {
+	struct rwbase_rt	rwbase;
+	atomic_t		readers;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map	dep_map;
+#endif
+} rwlock_t;
+
+#define __RWLOCK_RT_INITIALIZER(name)					\
+{									\
+	.rwbase = __RWBASE_INITIALIZER(name),				\
+	RW_DEP_MAP_INIT(name)						\
+}
+
+#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
+
+#define DEFINE_RWLOCK(name)						\
+	rwlock_t name = __RW_LOCK_UNLOCKED(name)
+
+#endif /* CONFIG_PREEMPT_RT */
+
+#endif /* __LINUX_RWLOCK_TYPES_H */