[PATCH 0/4] arch: Introduce smp_load_acquire() and smp_store_release()

[Peter Zijlstra <peterz@infradead.org>]

This should hopefully be the last posting of this series -- people felt it
needed one more mostly because last time I typoed the linux-kernel email
address.

If there are no further comments, Ingo will merge these patches in the next few
days.

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These patches introduce 2 new barrier primitives:

  smp_load_acquire(p)
  smp_store_release(p, v)

See the first patch, which changes Documentation/memory-barriers.txt, to find
the exact definitions of what an ACQUIRE/RELEASE barrier is -- previously known
as LOCK/UNLOCK barriers.

The second patch moves the smp_mb__{before,after}_atomic_{dec,inc}() barriers
to asm/atomic.h for arc and hexagon -- they were already there for all other archs.

This cleans up asm/barrier.h, and the third patch makes more agressive use of
asm-generic/barrier.h to implement the simple cases.

Then the fourth patch adds the new primitives.

Previous versions were widely build tested -- this version is not, but it also
not significantly different.

These patches apply to:

  tip/master


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Changes since the last version -- lkml.kernel.org/r/20131213145657.265414969@infradead.org

 - fixed linux-kernel email address
 - updated the Documentation patch