This can't be right. Together 1 and 2 would obviate the need for
wmb().
The CPU doing "STORE A; STORE B" will always see the operations
occuring
in program order by 1, and hence every other CPU would always see them
occurring in the same order by 2 -- even without wmb().
Either 2 is too strong, or else what you mean by "perceived" isn't
sufficiently clear.
2. is only for multiple stores to a _single_ memory location -- you
use wmb() to order stores to _separate_ memory locations.
Segher
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