acpi: don't call acpi_processor_init if acpi is disabled

Jens reported early_ioremap messages with old ASUS board...

> [    1.507461] pci 0000:00:09.0: Firmware left e100 interrupts enabled; disabling
> [    1.532778] early_ioremap(3fffd080, 0000005c) [0] => Pid: 1, comm: swapper Not tainted 2.6.31-rc4 #36
> [    1.561007] Call Trace:
> [    1.568638]  [<c136e48b>] ? printk+0x18/0x1d
> [    1.581734]  [<c15513ff>] __early_ioremap+0x74/0x1e9
> [    1.596898]  [<c15515aa>] early_ioremap+0x1a/0x1c
> [    1.611270]  [<c154a187>] __acpi_map_table+0x18/0x1a
> [    1.626451]  [<c135a7f8>] acpi_os_map_memory+0x1d/0x25
> [    1.642129]  [<c119459c>] acpi_tb_verify_table+0x20/0x49
> [    1.658321]  [<c1193e50>] acpi_get_table_with_size+0x53/0xa1
> [    1.675553]  [<c1193eae>] acpi_get_table+0x10/0x15
> [    1.690192]  [<c155cc19>] acpi_processor_init+0x23/0xab
> [    1.706126]  [<c1001043>] do_one_initcall+0x33/0x180
> [    1.721279]  [<c155cbf6>] ? acpi_processor_init+0x0/0xab
> [    1.737479]  [<c106893a>] ? register_irq_proc+0xaa/0xc0
> [    1.753411]  [<c10689b7>] ? init_irq_proc+0x67/0x80
> [    1.768316]  [<c15405e7>] kernel_init+0x120/0x176
> [    1.782678]  [<c15404c7>] ? kernel_init+0x0/0x176
> [    1.797062]  [<c10038b7>] kernel_thread_helper+0x7/0x10
> [    1.812984] 00000080 + ffe00000

that is rather later.
acpi_gbl_permanent_mmap should be set in acpi_early_init()
if acpi is not disabled

and we have
> [    0.000000] ASUS P2B-DS detected: force use of acpi=ht

just don't load acpi_processor_init...
Reported-and-tested-by: NJens Rosenboom <jens@leia.mcbone.net>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Acked-by: NIngo Molnar <mingo@elte.hu>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/acpi/processor_core.c

@@ -1151,6 +1151,9 @@ static int __init acpi_processor_init(void)
 {
 	int result = 0;
 
+	if (acpi_disabled)
+		return 0;
+
 	memset(&errata, 0, sizeof(errata));
 
 #ifdef CONFIG_SMP
@@ -1197,6 +1200,9 @@ static int __init acpi_processor_init(void)
 
 static void __exit acpi_processor_exit(void)
 {
+	if (acpi_disabled)
+		return;
+
 	acpi_processor_ppc_exit();
 
 	acpi_thermal_cpufreq_exit();