[PATCH v2 0/3] normalize return value of chip->irq_set_affinity() method

[Jiang Liu <liuj97@gmail.com>]

On x86 platforms, interrupt controller chip's irq_set_affinity() method
always copies affinity mask to irq_data->affinity field but still returns
0(IRQ_SET_MASK_OK). That return value causes the interrupt core logic
unnecessarily copies the mask to irq_data->affinity field again.
So return IRQ_SET_MASK_OK_NOCOPY instead of IRQ_SET_MASK_OK to get rid of
the duplicated copy operation.

v2: split it into three patches for core, x86 and IA64 according to
    Greg KH's suggestion

Jiang Liu (3):
  IRQ: introduce irq_do_set_affinity() to reduce duplicated code
  IRQ,x86: normalize return value of chip->irq_set_affinity() method
  IRQ,IA64: normalize return value of chip->irq_set_affinity() method

 arch/ia64/kernel/iosapic.c     |    4 +++-
 arch/ia64/kernel/msi_ia64.c    |    4 ++--
 arch/ia64/sn/kernel/irq.c      |    2 +-
 arch/ia64/sn/kernel/msi_sn.c   |    2 +-
 arch/x86/kernel/apic/io_apic.c |   11 ++++++-----
 arch/x86/platform/uv/uv_irq.c  |    2 +-
 kernel/irq/internals.h         |    3 +++
 kernel/irq/manage.c            |   39 ++++++++++++++++++++++-----------------
 kernel/irq/migration.c         |    6 +-----
 9 files changed, 40 insertions(+), 33 deletions(-)

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1.7.5.4