tree 2d846e3812b414f352d91779c311e4b08f1cd069
parent fb822e6076d972691c5dd33431c10f82dda94ae9
author Scott Wood <oss@buserror.net> 1456980664 -0600
committer Scott Wood <oss@buserror.net> 1457070185 -0600

powerpc/fsl-book3e: Avoid lbarx on e5500

lbarx/stbcx. are implemented on e6500, but not on e5500.
Likewise, SMT is on e6500, but not on e5500.

So, avoid executing an unimplemented instruction by only locking
when needed (i.e. in the presence of SMT).

Signed-off-by: Scott Wood <oss@buserror.net>