Improve IRQ remapping abstraction in x86 core code

Hi,

here is the second version of the patch-set to improve the abstraction
of interrupt remapping in the x86 core code. A more detailed description
can be found in the original post at:

	https://lkml.org/lkml/2012/8/7/317

Changes from v1->v2:

	* Fixed a couple of compile issues on i386 (reported by
	  Fengguang Wu, thanks a lot)
	* Rebased to Linux v3.6-rc2

Please review.

Thanks,

	Joerg

Diffstat:

 arch/x86/include/asm/hpet.h          |    5 +-
 arch/x86/include/asm/hw_irq.h        |   13 +-
 arch/x86/include/asm/io_apic.h       |   31 +++
 arch/x86/include/asm/irq_remapping.h |   40 ++--
 arch/x86/include/asm/pci.h           |    2 +
 arch/x86/include/asm/x86_init.h      |   30 ++-
 arch/x86/kernel/apic/apic.c          |   28 ++-
 arch/x86/kernel/apic/io_apic.c       |  377 +++++++++++++---------------------
 arch/x86/kernel/hpet.c               |    2 +-
 arch/x86/kernel/x86_init.c           |   25 ++-
 drivers/iommu/dmar.c                 |    2 +
 drivers/iommu/intel-iommu.c          |    2 +
 drivers/iommu/intel_irq_remapping.c  |    8 +
 drivers/iommu/irq_remapping.c        |  186 ++++++++++++++++-
 drivers/iommu/irq_remapping.h        |    3 +
 15 files changed, 454 insertions(+), 300 deletions(-)


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