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由 Michel Dänzer 提交于
This is necessary even with PCI(e) GART, and it makes writeback work even with AGP on my PowerBook. Might still be unreliable with older revisions of UniNorth and other AGP bridges though. Signed-off-by: NMichel Dänzer <daenzer@vmware.com> Reviewed-by: NAlex Deucher <alex.deucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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