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    SubjectRe: [PATCH 2/5] drm/virtio: add uapi for in and out explicit fences
      Hi,

    > The execbuffer IOCTL is now read-write to allow the userspace to read the
    > out-fence.

    > #define DRM_IOCTL_VIRTGPU_EXECBUFFER \
    > - DRM_IOW(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
    > + DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
    > struct drm_virtgpu_execbuffer)

    That changes the ioctl number and breaks the userspace api.

    cheers,
    Gerd

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