[PATCH] x86_64 irq: Remove unnecessary irq 0 setup.

The code in io_apic.c and in i8259.c currently hardcode the same
vector for the timer interrupt so there is no reason for a special
assignment for the timer as the setup for the i8259 already takes care
of this.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86_64/kernel/i8259.c

@@ -519,12 +519,6 @@ void __init init_IRQ(void)
 	}
 
 #ifdef CONFIG_SMP
-	/*
-	 * IRQ0 must be given a fixed assignment and initialized,
-	 * because it's used before the IO-APIC is set up.
-	 */
-	__get_cpu_var(vector_irq)[FIRST_DEVICE_VECTOR] = 0;
-
 	/*
 	 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
 	 * IPI, driven by wakeup.