x86, ioapic: Allocate ioapic_saved_data early

This allows re-using this buffer for enabling
interrupt-remapping during boot and resume. And thus allow for
consolidating the code between ioapic suspend/resume and
interrupt-remapping.

Tested-by: Daniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/20110518233157.481404505@sbsiddha-MOBL3.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/apic/io_apic.c

@@ -100,6 +100,11 @@ int mp_irq_entries;
 /* GSI interrupts */
 static int nr_irqs_gsi = NR_IRQS_LEGACY;
 
+/*
+ * Saved I/O APIC state during suspend/resume.
+*/
+static struct IO_APIC_route_entry *ioapic_saved_data[MAX_IO_APICS];
+
 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
 int mp_bus_id_to_type[MAX_MP_BUSSES];
 #endif
@@ -179,6 +184,14 @@ int __init arch_early_irq_init(void)
 		io_apic_irqs = ~0UL;
 	}
 
+	for (i = 0; i < nr_ioapics; i++) {
+		ioapic_saved_data[i] =
+			kzalloc(sizeof(struct IO_APIC_route_entry) *
+				nr_ioapic_registers[i], GFP_KERNEL);
+		if (!ioapic_saved_data[i])
+			pr_err("IOAPIC %d: suspend/resume impossible!\n", i);
+	}
+
 	cfg = irq_cfgx;
 	count = ARRAY_SIZE(irq_cfgx);
 	node = cpu_to_node(0);
@@ -2918,8 +2931,6 @@ static int __init io_apic_bug_finalize(void)
 
 late_initcall(io_apic_bug_finalize);
 
-static struct IO_APIC_route_entry *ioapic_saved_data[MAX_IO_APICS];
-
 static void suspend_ioapic(int ioapic_id)
 {
 	struct IO_APIC_route_entry *saved_data = ioapic_saved_data[ioapic_id];
@@ -2978,18 +2989,6 @@ static struct syscore_ops ioapic_syscore_ops = {
 
 static int __init ioapic_init_ops(void)
 {
-	int i;
-
-	for (i = 0; i < nr_ioapics; i++) {
-		unsigned int size;
-
-		size = nr_ioapic_registers[i]
-			* sizeof(struct IO_APIC_route_entry);
-		ioapic_saved_data[i] = kzalloc(size, GFP_KERNEL);
-		if (!ioapic_saved_data[i])
-			pr_err("IOAPIC %d: suspend/resume impossible!\n", i);
-	}
-
 	register_syscore_ops(&ioapic_syscore_ops);
 
 	return 0;