Includes the following four commits:
linuxkpi: Add sg_init_one
Needed for the virtio-gpu driver.
linuxkpi: add PAGE_ALIGNED macro
Needed for the virtio-gpu driver.
linuxkpi: Allow BUILD_BUG_ON in if statements without braces
I got a compilation failure in virtio-gpu without this change.
linuxkpi: implement ida_alloc()
Needed for the virtio-gpu driver.