ARM: Allow IPI_CPU_BACKTRACE to exploit FIQdev/trigger_backtrace-v4.6

The GIC (v1 & v2) driver allows its implementation of handle_arch_irq()
to be called from the FIQ handler but currently the ARM code is not
able to exploit this.

Extend handle_fiq_as_nmi() to call handle_arch_irq(). This will affect
all interrupt controllers, including ones that do not support FIQ. This
is OK because a spurious FIQ is normally fatal. Handling a spurious FIQ
like a normal interrupt does risk deadlock but does give us a chance
of surviving long enough to get an error message out.

We also extend the SMP code to indicate to irq drivers which IPIs they
should seek to implement using FIQ.

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

0 files changed, 0 insertions, 0 deletions