tree ea99c07b63fbc4606adc8e2a060c2318e6c7102f
parent 3249bce459ff0bb7c1621b00a8e2d6afe24c53bb
author Mark Rutland <mark.rutland@arm.com> 1470909041 +0100
committer Pawel Moll <pawel.moll@arm.com> 1472199367 +0100

bus: arm-ccn: fix PMU interrupt flags

Currently the IRQ core is permitted to make the CCN PMU IRQ handler
threaded, and will allow userspace to change the CPU affinity of the
interrupt behind our back. Both of these could violate our
synchronisation requirements with the core perf code, which relies upon
strict CPU affinity and disabling of interrupts to guarantee mutual
exclusion in some cases.

As with the CPU PMU drivers, we should request the interrupt with
IRQF_NOBALANCING and IRQF_NO_THREAD, to avoid these issues.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>