[PATCH] preempt-kernel on UP compile fix

A recent scheduler change looks to of affected this, and I missed it
since I did my last testing on SMP only.  Please, apply.

	Robert Love

include/asm-i386/smplock.h

@@ -15,6 +15,7 @@ extern spinlock_t kernel_flag;
 #else
 #ifdef CONFIG_PREEMPT
 #define kernel_locked()		preempt_get_count()
+#define global_irq_holder	0
 #else
 #define kernel_locked()		1
 #endif