  Revert is upstreamed with commit
http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b4276d7acf2e0f77044cb50caa6ad936fa78786,
i am now in corruption enviroment :) Good is only that -mtune=generic now works
OK performance wise.

 So on top of that, only if i disable all RADEON_FLAG_GTT_WC lines in
r600_buffer_common.c corruption goes away.