the bitrig marco_if_em_mpsafe branch has been created by marco. it is 4 commits behind master, and 1 commit ahead.
commit 19b8bddd52d4289a966df34b11aea778f62dd101 diff: https://github.com/bitrig/bitrig/commit/19b8bdd author: Marco Peereboom <[email protected]> date: Wed Jul 13 14:16:54 2016 -0500 disable mpsafe on em for testing purposes M sys/dev/pci/if_em.c
