[RFC v2 0/3] Support Soft NMI

This patch is based on suggestions from paulus and benh.
The bugs are all mine. The idea was to implement soft
NMI(s) by keeping interrupts enabled in the soft-disabled
state, but to use the interrupt controller to gate posting
of new interrupts to the processor. This is still work in
progress and a preliminary RFC that needs testing.

Nick posted a more comprehensive version for soft NMI at
https://patchwork.ozlabs.org/patch/704605/, but it does
not work when interrupts are disabled

TODOs:
	1. Integrate on top of
		https://patchwork.ozlabs.org/patch/706983/


Changelog v2:
 - Rename functions as suggested by Nick
 - Move irq in paca down for better alignment
 - Break the patches up further into interrupt disabling
   and soft nmi patches
 - Support only PPC_XICS for now

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <redacted>
Cc: Nicholas Piggin <npiggin@gmail.com>

Balbir Singh (3):
  Merge IPI and DEFAULT priorities
  Keep interrupts enabled even on soft disable
  Enable soft nmi handler

 arch/powerpc/include/asm/paca.h      |  1 +
 arch/powerpc/include/asm/xics.h      |  8 ++----
 arch/powerpc/kernel/exceptions-64s.S | 33 +++++++++++++++++------
 arch/powerpc/kernel/irq.c            | 52 +++++++++++++++++++++++++++++++++++-
 arch/powerpc/kernel/time.c           | 27 ++++++++++++++++++-
 5 files changed, 105 insertions(+), 16 deletions(-)

-- 
2.9.3