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Subject[PATCH -rt] revert bh_lru_lock() to preempt_disable()
	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 <>

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()
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