From: Alison Schofield <alison.schofield@intel.com>
To: Davidlohr Bueso <dave@stgolabs.net>,
	Jonathan Cameron <jic23@kernel.org>,
	Dave Jiang <dave.jiang@intel.com>,
	Alison Schofield <alison.schofield@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Ira Weiny <iweiny@kernel.org>,
	Li Ming <ming.li@zohomail.com>
Cc: linux-cxl@vger.kernel.org
Subject: [PATCH v3 0/3] cxl: Format the device serial number as unsigned
Date: Fri, 24 Jul 2026 13:37:16 -0700
Message-ID: <cover.1784924949.git.alison.schofield@intel.com>
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Changes in v3:
- PATCH 1 commit messaged updated with link to work-around direction
- No other changes.


This series supersedes the previously posted standalone fix:
  cxl/pmem: Format nvdimm serial number as decimal

That patch addressed the immediate auto-unlock failure caused by the
kernel formatting the nvdimm security key description differently than
the decimal 'id' sysfs attribute used by ndctl.

Further review uncovered a second formatting issue affecting the same
serial number. The CXL device serial number is a u64 PCIe Device Serial
Number, yet several kernel interfaces format it with signed "%lld".
Devices whose vendor OUI sets bit 63 therefore appear with negative
decimal serial numbers.

Serials with bit 64 set are expected. The most significant byte of the
PCIe Device Serial Number contains the vendor OUI, so vendors such as
Montage naturally produce serial numbers with bit 63 set.

Rather than merge the decimal-format fix and immediately follow it with
another patch changing the same code to "%llu", fold both fixes into a
single series that consistently formats CXL serial numbers as unsigned
where appropriate and adds cxl_test coverage for the large serial case.


Alison Schofield (3):
  cxl/pmem: Format the nvdimm serial number as unsigned decimal
  cxl/core: Format the memdev serial number as unsigned in TP_printk
  cxl/test: Assign one mock memdev a full-width serial number

 Documentation/ABI/testing/sysfs-bus-nvdimm |  3 ++-
 drivers/cxl/core/pmem.c                    | 10 ++++++----
 drivers/cxl/core/trace.h                   | 10 +++++-----
 drivers/cxl/cxl.h                          |  3 ++-
 drivers/cxl/pmem.c                         |  2 +-
 tools/testing/cxl/test/mem.c               | 15 ++++++++++++++-
 6 files changed, 30 insertions(+), 13 deletions(-)


base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
-- 
2.37.3