This patch series adds support to handle interrupt registration/deregistration
in arm64 pmu driver when pmu interrupt type is percpu.

Changelog:
V6:
* In arm64 pmu driver: Use macro 'IRQ_TYPE_NONE' while passing irq type value
  to enable_percpu_irq(). Change 'irqs' etc variables as unsigned, modify the
  check for 'irqs' inside armpmu_[release/reserve]_hardware().

V5:
* In irqdesc.h: Added Chris Smith's sign-off.
  In arm64 pmu driver: Handle the invalid irq-0 case for platform_get_irq().

V4:
* In arm64 pmu driver: Avoid using irq_to_desc() to check validity of irq.

V3:
* Remove validity check for 'desc' from accessor function in irqdesc.h .
  Instead, check the irq 'desc' validity in arm64 pmu driver.

V2:
* To determine whether an IRQ is percpu or not, added an accessor function in
  irqdesc.h . This approach was used by Chris Smith here[1] for similar changes
  in arm pmu driver.
* In arm64 pmu driver: Got rid of unnecessary pointer typecastings.

[1] http://lkml.indiana.edu/hypermail/linux/kernel/1207.3/02955.html

Vinayak Kale (2):
  genirq: Add an accessor for IRQ_PER_CPU flag
  arm64: perf: add support for percpu pmu interrupt

 arch/arm64/kernel/perf_event.c |  116 +++++++++++++++++++++++++++++-----------
 include/linux/irqdesc.h        |    8 +++
 2 files changed, 94 insertions(+), 30 deletions(-)

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1.7.9.5