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 + lkml.kernel.org/r/20131211215850.GA810@xxxxxxxxxxxxxxxxxx
---
Changes since the last version -- lkml.kernel.org/r/20131107220314.740353088@xxxxxxxxxxxxx
- rebased
- broke out the smp_mb__*atomic* movement
- changed the ia64 implementation to use volatile instead
of actual ASM goo -- Tony, do let me know if you would
prefer to have the ASM goo back; but given you said that
gcc-ia64 generates the right instructions for volatile...
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