tools/virtio: cleanups, fixes

Recent virtio changes brought about build errors for tools/virtio, as usual. I did some refactoring to hopefully reduce maintainance load going forward.

Adding stubs is tedious and seemed a perfect fit for cursor - so I used it for that, then rewrote some commits and accepted others. commit logs I've rewritten.

Found and fixed a couple of minor bugs while doing this - that part's all mine.

Michael S. Tsirkin (14):
tools/virtio: fix up compiler.h stub
virtio: make it self-contained
tools/virtio: use kernel's virtio.h tools/virtio: add struct module forward declaration tools/virtio: stub DMA mapping functions tools/virtio: add dev_WARN_ONCE and is_vmalloc_addr stubs tools/virtio: add ucopysize.h stub
tools/virtio: pass KCFLAGS to module build tools/virtio: add struct cpumask to cpumask.h tools/virtio: stub might_sleep and synchronize_rcu tools/virtio: switch to kernel's virtio_config.h
virtio_features: make it self-contained tools/virtio: fix up oot build
tools/virtio: add device, device_driver stubs

 include/linux/virtio.h             |   2 +
 include/linux/virtio_features.h    |   2 +
 tools/virtio/Makefile              |   8 ++-
 tools/virtio/linux/compiler.h      |   6 ++
 tools/virtio/linux/cpumask.h       |   4 ++
 tools/virtio/linux/device.h        |   8 +++
 tools/virtio/linux/dma-mapping.h   |   4 ++
 tools/virtio/linux/kernel.h        |  16 +++++
 tools/virtio/linux/module.h        |   2 +
 tools/virtio/linux/ucopysize.h     |  21 ++++++
 tools/virtio/linux/virtio.h        |  73 +--------------------
 tools/virtio/linux/virtio_config.h | 102 +----------------------------
 tools/virtio/oot-stubs.h           |  10 +++
 13 files changed, 82 insertions(+), 176 deletions(-)
 create mode 100644 tools/virtio/linux/ucopysize.h
 create mode 100644 tools/virtio/oot-stubs.h

MST