[PATCH RESEND 0/5] ARC futex fixes

From: Vineet Gupta
Date: Tue Aug 25 2015 - 03:32:51 EST

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

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).


Vineet Gupta (5):
ARC: add barriers to futex code
ARC: futex cosmetics
ARC: make futex_atomic_cmpxchg_inatomic() return bimodal
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(-)


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