[GIT PULL] ARC fixes for 4.2-rc6

[Vineet Gupta]

Hi Linus,

Here's a late pull request for accumulated ARC fixes which came out of extended testing of the new ARCv2 port with LTP etc. llock/scond livelock workaround has been reviewed by PeterZ. The changes look a lot but I've crafted them into finer grained patches for better tracking later.

I have some more fixes (ARC Futex backend) ready to go but those will have to wait for tglx to return from vacation.

Please pull.

Thx,
-Vineet
--------------->
The following changes since commit 52721d9d3334c1cb1f76219a161084094ec634dc:

  Linux 4.2-rc3 (2015-07-19 14:45:02 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc.git/ tags/arc-v4.2-rc6-fixes

for you to fetch changes up to 10971638701dedadb58c88ce4d31c9375b224ed6:

  ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff (2015-08-07 13:56:16 +0530)

----------------------------------------------------------------
Enabling a reduced config of HS38 (w/o div-rem, ll64...)
Adding software workaround for LLOCK/SCOND livelock
Fallout of a recent pt_regs update

----------------------------------------------------------------
Alexey Brodkin (2):
      ARCv2: add knob for DIV_REV in Kconfig
      ARCv2: allow selection of page size for MMUv4

Vineet Gupta (12):
      ARCv2: lib: memcpy: Missing PREFETCHW
      ARCv2: lib: memset: Don't assume 64-bit load/stores
      ARCv2: Fix the peripheral address space detection
      ARCv2: [axs103_smp] Reduce clk for Quad FPGA configs
      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
      ARC: Make pt_regs regs unsigned
      ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff

Viresh Kumar (1):
      ARC/time: Migrate to new 'set-state' interface

 arch/arc/Kconfig                      |  13 +-
 arch/arc/Makefile                     |  10 +-
 arch/arc/include/asm/arcregs.h        |   7 +-
 arch/arc/include/asm/atomic.h         |  78 +++--
 arch/arc/include/asm/ptrace.h         |  54 ++--
 arch/arc/include/asm/spinlock.h       | 538 +++++++++++++++++++++++++++++++++-
 arch/arc/include/asm/spinlock_types.h |   2 +
 arch/arc/include/uapi/asm/ptrace.h    |  20 +-
 arch/arc/kernel/setup.c               |  12 +-
 arch/arc/kernel/time.c                |  40 +--
 arch/arc/lib/memcpy-archs.S           |   2 +-
 arch/arc/lib/memset-archs.S           |  43 ++-
 arch/arc/plat-axs10x/axs10x.c         |  15 +
 13 files changed, 718 insertions(+), 116 deletions(-)
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