[PATCH] ppc64: More IOMMU cleanups
* Tidy up some of the arguments to iommu_*() * Comment cleanup * Don't bump the hint to the next block for large allocs, to avoid fragmentation. * Simplify vmerge logic during SG allocations * Move the memory barriers from the bus-specific parts into the common code. Some changes are mine, some are from Ben Herrenschmidt.
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