nvme: add context annotations in rdma.c

device_list and nvme_rdma_device::entry are protected by
device_list_mutex. Define device_list using
LIST_HEAD_GUARDED(device_list, device_list_mutex) and annotate
nvme_rdma_device::entry with __guarded_by(&device_list_mutex) so that
Clang's context analysis can validate accesses against the corresponding
locking requirements.

Similarly, nvme_rdma_ctrl_list and nvme_rdma_ctrl::list are
protected by nvme_rdma_ctrl_mutex. Define nvme_rdma_ctrl_list using
LIST_HEAD_GUARDED(nvme_rdma_ctrl_list, nvme_rdma_ctrl_mutex) and
annotate nvme_rdma_ctrl::list with __guarded_by(&nvme_rdma_ctrl_mutex).

It is safe to initialize nvme_rdma_ctrl::list while allocating the
controller object because the list entry has not yet been added to
nvme_rdma_ctrl_list. Annotate the initialization with context_unsafe()
to suppress the corresponding Clang context analysis warning.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

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