[PATCHv2 00/17] Support Clang context analysis for NVMe host drivers

[Nilay Shroff <nilay@linux.ibm.com>]

This series adds support for Clang's context analysis to the NVMe host
drivers.

Recent work[1] by Marco Elver introduced infrastructure for lock context
analysis in the kernel, allowing Clang to verify locking requirements at
compile time through various annotations.

This series build on top of that infrastructure by annotating the NVMe
host drivers with the appropriate locking requirements and by addressing
warnings reported by the analyzer. 

The series was built and tested with LLVM/Clang 23.x and enables the
NVMe host drivers to build cleanly with CONFIG_CONTEXT_ANALYSIS enabled.

Support for the NVMe target drivers will be addressed separately.

As usual, comments/feedback/suggestions are most welcome!

Thanks!

[1] https://lore.kernel.org/lkml/20251219154418.3592607-1-elver@google.com/

Changes from v1:
  - replace guard() with scoped_guard() for guarding request_list (Bart)
  - annotate nvme_alloc_ns_head() using __must_hold(&ctrl->subsys->lock)
    (Sashiko)
  - guard nvme_queue::sq_cmds using nvme_queue::sq_lock
  - annotate nvme_cqe_pending() using context_unsafe in nvme_poll()
    (Keith)
  - Split patch #13 and #14 to separate the context annotation change
    from functionality change (Bart)

Nilay Shroff (17):
  nvme: update nvme_passthru_end() signature
  nvme: add Clang context annotations for nvme_passthru_{start|stop}
  nvme: add Clang context annotations for nvme_ns_head::srcu
  nvme: add Clang context annotations for nvme_ns_head::requeue_list
  nvme: add Clang context annotations for nvme_ns_head::current_path
  nvme: add Clang context annotations for nvme_dev::shutdown_lock
  nvme: add Clang context annotations for nvme_subsystem::lock
  nvme: add Clang context annotations for nvme_ctrl::ana_lock
  nvme: add Clang context annotations for nvme_subsystems_lock
  nvme: add Clang context annotations in fabric.c
  nvme: add Clang context annotations for nvme_queue::sq_lock
  nvme: add Clang context annotations for nvme_queue::cq_poll_lock
  nvme: add Clang context annotations in rdma.c
  nvme: fix Clang context analysis warning in rdma.c
  nvme: add Clang context annotations in tcp.c
  nvme: fix Clang context analysis warning in tcp.c
  nvme: enable Clang context analysis support for nvme host driver

 drivers/nvme/host/Makefile    |  1 +
 drivers/nvme/host/core.c      | 24 +++++++++++++++------
 drivers/nvme/host/fabrics.c   |  4 ++--
 drivers/nvme/host/ioctl.c     |  2 +-
 drivers/nvme/host/multipath.c | 28 +++++++++++++++++++++----
 drivers/nvme/host/nvme.h      | 38 +++++++++++++++++++++-------------
 drivers/nvme/host/pci.c       | 39 ++++++++++++++++++++++++++++-------
 drivers/nvme/host/rdma.c      | 28 ++++++++++++++-----------
 drivers/nvme/host/tcp.c       | 19 ++++++++++-------
 9 files changed, 129 insertions(+), 54 deletions(-)

-- 
2.53.0