[PATCH 0/6] ARC: spinlocks/atomics rework

[Vineet Gupta]

Hi Peter,

Just running this by you for quick eye balling and also as FYI.
The PREFETCHW workaround for llock/scond livelock was not sufficient after
all and we had to do some work there. Extending testing of quad core FPGA
builds shows things pretty stable, whereas w/o patches some of the LTP tests
(shm_open/23-1) would cause the system to go bonkers.

I need to send this to Linus 4.2-rcx so will appreicate if you could take
a quick peek.

Thx,
-Vineet

Vineet Gupta (6):
  Revert "ARCv2: STAR 9000837815 workaround hardware exclusive
    transactions livelock"
  ARC: refactor atomic inline asm operands with symbolic names
  ARC: LLOCK/SCOND based spin_lock
  ARC: LLOCK/SCOND based rwlock
  ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with
    exponential backoff
  ARCv2: spinlock/rwlock: Reset retry delay when starting a new
    spin-wait cycle

 arch/arc/Kconfig                      |   5 +
 arch/arc/include/asm/atomic.h         | 113 +++++--
 arch/arc/include/asm/spinlock.h       | 551 +++++++++++++++++++++++++++++++++-
 arch/arc/include/asm/spinlock_types.h |   2 +
 arch/arc/kernel/setup.c               |   4 +
 5 files changed, 636 insertions(+), 39 deletions(-)

-- 
1.9.1

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