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[PATCH v4 0/5] x86/apic: Fix restoring boot irq mode in reboot and kexec/kdump




This is v4 post. Only patch 0002 is updated.

A regression bug was introduced in below commit.
commit 522e66464467 ("x86/apic: Disable I/O APIC before shutdown of the local APIC")

It caused the action to fail which we try to restore boot irq mode
in reboot and kexec/kdump. Details can be seen in patch 0002.

Warning can always be seen during kdump kernel boot on qemu/kvm
platform. Our customer even saw casual kdump kernel hang once in
~30 attempts during stress testing of kdump on KVM machine.

v3->v4:
  Eric pointed out that in patch 0002 the change related to
  KEXEC_JUMP is not right.
  Correct it.

  Add Fixes tag and Cc to stable.

v2->v3:
  Change as Eric suggested:

  Rerrange patches and change code and messy function/variable naming.
  Change patch subject and log to make it more understandable. 

Baoquan He (5):
  x86/apic: Split out restore_boot_irq_mode from disable_IO_APIC
  x86/apic: Fix restoring boot irq mode in reboot and kexec/kdump
  x86/apic: Remove useless disable_IO_APIC
  x86/apic: Rename variable/function related to x86_io_apic_ops
  x86/apic: Set up through-local-APIC on boot CPU if 'noapic' specified

 arch/x86/include/asm/io_apic.h     |  9 +++++----
 arch/x86/include/asm/x86_init.h    |  8 ++++----
 arch/x86/kernel/apic/apic.c        |  2 +-
 arch/x86/kernel/apic/io_apic.c     | 16 ++++------------
 arch/x86/kernel/crash.c            |  3 ++-
 arch/x86/kernel/machine_kexec_32.c |  8 ++++----
 arch/x86/kernel/machine_kexec_64.c |  8 ++++----
 arch/x86/kernel/reboot.c           |  3 ++-
 arch/x86/kernel/x86_init.c         |  6 +++---
 arch/x86/xen/apic.c                |  2 +-
 drivers/iommu/irq_remapping.c      |  4 ++--
 11 files changed, 32 insertions(+), 37 deletions(-)

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2.13.6