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dma_fence_default_wait is the default now, same for the trivial enable_signaling implementation. Also remove the ->signaled callback, vgem can't peek ahead with a fastpath, returning false is the default implementation. v2: Protect the meaningful space! (Chris) Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Kees Cook <keescook@chromium.org> Cc: Cihangir Akturk <cakturk@gmail.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sean Paul <seanpaul@chromium.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180809124544.9250-1-daniel.vetter@ffwll.ch