Benjamin Close 14581afb47 xfree86: correctly define barriers for FreeBSD amd64 ...

Previously when compiling on freebsd amd64 we'd end up at xi86
block (line 1315) which would define mem_barrier and write_mem_barrier
to be NOP's. Instead they should be valid, as per the linux amd64 setup.

This stops the hangs experienced by many when using the nv driver
which would hang due to out of order dma requests as noticed in
http://bugs.freedesktop.org/show_bug.cgi?id=3168

Signed-off-by: Benjamin Close <Benjamin.Close@clearchain.com>

2009-06-17 15:58:03 +09:30

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