RE: Fix unlock_buffer() to work the same way as bit_unlock()

[Chen, Kenneth W]

Nick Piggin wrote on Tuesday, March 28, 2006 12:11 AM
> Also, I think there is still the issue of ia64 not having the
> correct memory consistency semantics. To start with, all the bitops
> and atomic ops which both modify their operand and return a value
> should be full memory barriers before and after the operation,
> according to Documentation/atomic_ops.txt.


I suppose the usage of atomic ops is abused, it is used in both lock
and unlock path.  And it naturally suck because it now requires full
memory barrier.  A better way is to define 3 variants: one for lock
path, one for unlock path, and one with full memory fence.

- Ken
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