table:
- if_bge now marked as INTR_MPSAFE, SMPng locked. Busdma is now tested.
- if_dc now marked as INTR_MPSAFE, SMPng locked. Note that this driver
uses MTX_RECURSE.
- if_de no longer uses vtophys().
- if_em is now SMPng locked.
- if_en contains locking, but is not marked as INTR_MPSAFE.
- if_ep is now marked as INTR_MPSAFE, SMPng locked, but uses MTX_RECURSE.
- if_fxp is now marked SMPng locked.
- if_gx has locking, but isn't marked INTR_MPSAFE. Uses MTX_RECURSE.
- if_pcn still uses vtophys(); locking is present, but it's not marked
as INTR_MPSAFE, and the mutex is marked MTX_RECURSE.
- if_rl contains locking, but isn't marked as INTR_MPSAFE. The mutex
is marked MTX_RECURSE.
- if_sf still uses vtophys(). It contains locking, but uses MTX_RECURSE
and isn't marked INTR_MPSAFE.
- if_sis has locking, but isn't marked as INTR_MPSAFE. Its mutex is
marked MTX_RECURSE.
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