Signed-off-by: John Kacur <jkacur@gmail.com>

This patch fixes a compile error for platforms that are not using
CONFIG_RWSEM_GENERIC_SPINLOCK
that occurs when you don't configure CONFIG_PREEMPT_RT

It should be folded into the rt-mutex-core.patch

Index: linux-2.6.26.5-rt9/include/linux/rwsem.h
===================================================================
--- linux-2.6.26.5-rt9.orig/include/linux/rwsem.h
+++ linux-2.6.26.5-rt9/include/linux/rwsem.h
@@ -146,10 +146,14 @@ static inline void downgrade_write(struc
 {
 	compat_downgrade_write(rwsem);
 }
+
+#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
 static inline int rwsem_is_locked(struct compat_rw_semaphore *sem)
 {
 	return compat_rwsem_is_locked(sem);
 }
+#endif
+
 # define down_read_nested(sem, subclass) \
 		compat_down_read_nested(sem, subclass)
 # define down_write_nested(sem, subclass) \