[PATCH] kdump/i386: apic verification failure fix

o Removes the unnecessary call to local_irq_disable().

o Kdump was failing while second kernel was coming up. Check for presence
  of boot cpu apic id was failing in (apic_id_registered), hence hitting
  BUG().

o This should not have failed because before calling setup_local_APIC(), it is
  ensured that even if BIOS has not reported boot cpu, then hard set the
  prence of it. Problem happens because of usage of hard_smp_processor_id()
  which is hardcoded to zero in case of non SMP kernel. In kdump case second
  kernel can boot on a cpu whose boot cpu id is not zero.

o Using boot_cpu_physical_apicid instead to hard set the presence of boot cpu.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/apic.c

@@ -1055,7 +1055,6 @@ void __init setup_boot_APIC_clock(void)
 	using_apic_timer = 1;
 
 	local_irq_save(flags);
-	local_irq_disable();
 
 	calibration_result = calibrate_APIC_clock();
 	/*
@@ -1299,7 +1298,7 @@ int __init APIC_init(void)
 	if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
 		printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
 				boot_cpu_physical_apicid);
-		physid_set(hard_smp_processor_id(), phys_cpu_present_map);
+		physid_set(boot_cpu_physical_apicid, phys_cpu_present_map);
 	}
 
 	/*