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[v2,0/3] powerpc/64: interrupt soft-mask management fixes

Message ID 20220906060337.3302557-1-npiggin@gmail.com (mailing list archive)
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Series powerpc/64: interrupt soft-mask management fixes | expand

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Nicholas Piggin Sept. 6, 2022, 6:03 a.m. UTC 
Since last posting I've added more debugging and done some test code
that tires to irritate this on hardware (e.g., put DEC into the
MUST_HARD_MASK category, set_dec(1) in the hash fault handler, run
with perf, etc), and also trigger interrupts at various points stepping
through in the simulator.

I haven't been able to break it. Sachin reported he couldn't reproduce
the previous lockups he saw so possibly that was a red herring.

I'd like to try again to close this if possible, it's probably one of
the last major known uglinesses in the soft masking code.

Thanks,
Nick

Nicholas Piggin (3):
  powerpc/64/interrupt: Fix return to masked context after hard-mask irq
    becomes pending
  powerpc/64s: Fix irq state management in runlatch functions
  powerpc/64s/interrupt: masked handler debug check for previous hard
    disable

 arch/powerpc/include/asm/runlatch.h  |  6 ++---
 arch/powerpc/kernel/exceptions-64s.S | 10 ++++++++
 arch/powerpc/kernel/interrupt.c      | 10 --------
 arch/powerpc/kernel/interrupt_64.S   | 34 +++++++++++++++++++++++++---
 4 files changed, 43 insertions(+), 17 deletions(-)