[PATCH -rt] revert bh_lru_lock() to preempt_disable()

[Daniel Walker]

	The bh_lru_lock() was set to disable interrupt to protect
from IPI's, which are only on SMP . So I don't think it's needed
in UP PREEMPT_RT configs. 

Signed-Off-By: Daniel Walker <dwalker@xxxxxxxxxx>

Index: linux-2.6.16/fs/buffer.c
===================================================================
--- linux-2.6.16.orig/fs/buffer.c
+++ linux-2.6.16/fs/buffer.c
@@ -1326,7 +1326,7 @@ struct bh_lru {
 
 static DEFINE_PER_CPU(struct bh_lru, bh_lrus) = {{ NULL }};
 
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
+#if defined(CONFIG_SMP) 
 #define bh_lru_lock()	local_irq_disable()
 #define bh_lru_unlock()	local_irq_enable()
 #else
-
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