Alan Cox
3687797618
amd64: Don't repeat unnecessary tests when cmpset fails ...
When a cmpset for removing the PG_RW bit in pmap_promote_pde() fails,
there is no need to repeat the alignment, PG_A, and PG_V tests just to
reload the PTE's value. The only bit that we need be concerned with at
this point is PG_M. Use fcmpset instead.
MFC after: 1 week
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3687797618