[RFC][PATCH 08/13] percpu-rwsem: DEFINE_STATIC_PERCPU_RWSEM

[Peter Zijlstra <peterz@infradead.org>]

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Provide a static init

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 include/linux/percpu-rwsem.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/include/linux/percpu-rwsem.h
+++ b/include/linux/percpu-rwsem.h
@@ -16,6 +16,19 @@ struct percpu_rw_semaphore {
 	struct rw_semaphore	rw_sem;
 };
 
+#define DEFINE_STATIC_PERCPU_RWSEM(name)				\
+static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_refcount_##name);	\
+static struct percpu_rw_semaphore name = {				\
+	.refcount = &__percpu_rwsem_refcount_##name,			\
+	.state = 0,							\
+	.rss = __RCU_SYNC_INITIALIZER(name.rss, RCU_SCHED_SYNC),	\
+	.writer = __WAIT_QUEUE_HEAD_INITIALIZER(name.writer),		\
+	.rw_sem = __RWSEM_INITIALIZER(name.rw_sem),			\
+}
+
+#define lockdep_assert_held_percpu_rwsem(sem)				\
+	lockdep_assert_held(&(sem)->rw_sem)
+
 extern void __percpu_down_read(struct percpu_rw_semaphore *);
 extern bool __percpu_down_read_trylock(struct percpu_rw_semaphore *);
 extern void __percpu_up_read(struct percpu_rw_semaphore *);


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