[PATCH RESEND 0/5] ARC futex fixes

[Vineet Gupta]

Hi Thomas/Peter,

Of late I've been debugging a seeming lost wakeup when running a specific
EEMBC Multibench workload (4M-check -w4) on a quad core HS38 config on FPGA
CONFIG_SMP, CONFIG_PREEMPT.

I've yet to nail that issue down, but in the process found some deficinecies
in ARC futex backend. Can you please take a quick look and shout if there's
something wrong there.

The futex backend for ARC, despite it's age, only recently started getting
real testing due to recent switch to NPTL based userland (uClibc).

Thx,
-Vineet

Vineet Gupta (5):
  ARC: add barriers to futex code
  ARC: futex cosmetics
  ARC: make futex_atomic_cmpxchg_inatomic() return bimodal
  ARC: Enable HAVE_FUTEX_CMPXCHG
  ARC: ensure futex ops are atomic in !LLSC config

 arch/arc/Kconfig             |  1 +
 arch/arc/include/asm/futex.h | 66 +++++++++++++++++++++++++++-----------------
 2 files changed, 41 insertions(+), 26 deletions(-)

-- 
1.9.1

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