From 49faecbc581de038b423d7abbebe0d7b50ed15ef Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 8 Apr 2013 16:08:46 +0200
Subject: [PATCH] percpu-rwsem: compile fix

The shortcut on mainline skip lockdep. No idea why this is a good thing.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 lib/percpu-rwsem.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-stable/lib/percpu-rwsem.c
===================================================================
--- linux-stable.orig/lib/percpu-rwsem.c
+++ linux-stable/lib/percpu-rwsem.c
@@ -84,8 +84,12 @@ void percpu_down_read(struct percpu_rw_s
 
 	down_read(&brw->rw_sem);
 	atomic_inc(&brw->slow_read_ctr);
+#ifdef CONFIG_PREEMPT_RT_FULL
+	up_read(&brw->rw_sem);
+#else
 	/* avoid up_read()->rwsem_release() */
 	__up_read(&brw->rw_sem);
+#endif
 }
 
 void percpu_up_read(struct percpu_rw_semaphore *brw)