[powerpc/nmi: RFC 0/2] Support Soft NMI

[Balbir Singh <bsingharora@gmail.com>]

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

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

Balbir Singh (2):
  Merge IPI and DEFAULT priorities
  Keep interrupts enabled even on soft disable

 arch/powerpc/include/asm/paca.h      |  1 +
 arch/powerpc/include/asm/xics.h      |  8 ++------
 arch/powerpc/kernel/exceptions-64s.S | 17 ++++++++++-------
 arch/powerpc/kernel/irq.c            | 21 ++++++++++++++++++++-
 arch/powerpc/kernel/time.c           | 27 ++++++++++++++++++++++++++-
 5 files changed, 59 insertions(+), 15 deletions(-)

-- 
2.9.3