Commit 009b29d9 authored Oct 30, 2005 by Vivek Goyal Committed by Linus Torvalds Oct 30, 2005

[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>

parent bda98685

arch/i386/kernel/apic.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -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);
		}

		/*