arm: perf: Make v7 support FIQ-safe

armv7pmu_disable_event() is called during irq handling. If irq handling
switches over to fiq then the spin locks in this function risk deadlock.
Both armv7_pmnc_disable_counter() and armv7_pmnc_disable_intens() are
unconditional co-processor writes. I haven't yet come up with an
schedule where other users of pmu_lock would break if interleaved with
these calls so I have simply removed them.

The other change required us to avoid calling irq_work_run() when run
from a FIQ handler. The pended work will either be dispatched by the
irq work IPI or by a timer handler.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

0 files changed, 0 insertions, 0 deletions