[PATCH] 2.6.20-rc6-mm1: Fix compile if PREEMPT_RCU is set, but RCU_TRACE isn't

[Bernhard Rosenkraenzer <bero@arklinux.org>]

2.6.20-rc6-mm1 fails to compile if CONFIG_PREEMPT_RCU is set and
CONFIG_RCU_TRACE isn' -- the fix is fairly obvious.

Signed-off-by: Bernhard Rosenkraenzer <bero@arklinux.org>

---

--- linux-2.6.19/kernel/rcupreempt.c.ark	2007-01-28 23:38:07.000000000 +0100
+++ linux-2.6.19/kernel/rcupreempt.c	2007-01-28 23:38:12.000000000 +0100
@@ -619,7 +619,7 @@
 	synchronize_rcu();
 }
 
-#ifdef RCU_TRACE
+#ifdef CONFIG_RCU_TRACE
 int *rcupreempt_flipctr(int cpu)
 {
 	return &per_cpu(rcu_flipctr, cpu)[0];
-
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