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drm/radeon: make MMU_NOTIFIER optional
In cases where MMU_NOTIFIER is not available, userptr will not be available. Similar to i915, although not making an exception for CAP_SYS_ADMIN. The proposed userspace patches for userptr seem to handle the fall- back properly, so a userptr-less kernel should not be a problem. Signed-off-by: Rob Clark <[email protected]> Signed-off-by: Alex Deucher <[email protected]>
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