6634322 xdf doesn't properly handle lack of barrier feature

[mark.john...@sun.com]

Author: mrj
Repository: /hg/onnv/onnv-gate
Latest revision: 6b0a019a44b0ffebb91245809652f740d6477f32
Total changesets: 1
Log message:
6634322 xdf doesn't properly handle lack of barrier feature
Contributed by Juergen Keil (jk at tools.de)

Files:
        update: usr/src/uts/common/xen/io/xdf.c