x86: pre init pirq_entries[]

Impact: cleanup

set default value early - this allows the removal of a number
of dynamic initialization codepaths, and an #ifdef.
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/io_apic.c

@@ -813,8 +813,9 @@ static void clear_IO_APIC (void)
  */
 
 #define MAX_PIRQS 8
-static int pirq_entries [MAX_PIRQS];
-static int pirqs_enabled;
+static int pirq_entries[MAX_PIRQS] = {
+	[0 ... MAX_PIRQS - 1] = -1
+};
 
 static int __init ioapic_pirq_setup(char *str)
 {
@@ -823,10 +824,6 @@ static int __init ioapic_pirq_setup(char *str)
 
 	get_options(str, ARRAY_SIZE(ints), ints);
 
-	for (i = 0; i < MAX_PIRQS; i++)
-		pirq_entries[i] = -1;
-
-	pirqs_enabled = 1;
 	apic_printk(APIC_VERBOSE, KERN_INFO
 			"PIRQ redirection, working around broken MP-BIOS.\n");
 	max = MAX_PIRQS;
@@ -1976,13 +1973,6 @@ void __init enable_IO_APIC(void)
 	int apic;
 	unsigned long flags;
 
-#ifdef CONFIG_X86_32
-	int i;
-	if (!pirqs_enabled)
-		for (i = 0; i < MAX_PIRQS; i++)
-			pirq_entries[i] = -1;
-#endif
-
 	/*
 	 * The number of IO-APIC IRQ registers (== #pins):
 	 */