tree f96a8826877e4c28fdc40f6e1aa4a1cf42187e22
parent 3d94ae0c70a71a9824479366775e2c7679a57d94
author Jeremy Fitzhardinge <jeremy@goop.org> 1317410050 -0700
committer Jeremy Fitzhardinge <jeremy@goop.org> 1322246592 -0800

x86: consolidate xchg and xadd macros

They both have a basic "put new value in location, return old value"
pattern, so they can use the same macro easily.

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>