linux-kernel - [GIT PULL] Compute Express Link (CXL) Fix for 6.9-rc7

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Message-ID: <64b8cfc3-c2f2-487a-bced-8519690239a4@intel.com>
Date: Fri, 3 May 2024 09:21:51 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
 linux-kernel <linux-kernel@...r.kernel.org>,
 Dan Williams <dan.j.williams@...el.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Davidlohr Bueso <dave@...olabs.net>, Ira Weiny <ira.weiny@...el.com>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>
Subject: [GIT PULL] Compute Express Link (CXL) Fix for 6.9-rc7

Hi Linus, please pull from

  git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git tags/cxl-fixes-6.9-rc7

..to receive a fix for the CXL subsystem.

A late bug was reported by Robert Richter that the Restricted CXL Host
(RCH) support was missing in the CXL endpoint access_coordinate
calculation. The missing support causes the topology iterator to stumble over
a NULL pointer and triggers a kernel OOPS on a platform with CXL 1.1 support.
The fix bypasses RCH topology as the access_coordinate calculation is not
necessary since RCH does not support hotplug and the memory region exported
should be covered by the HMAT table already. A unit test is also added to
cxl_test to check against future regressions on the topology iterator.

This has build success notification from kbuild-robot. It has been in the -next
for several days with no reported issues.

---

The following changes since commit e67572cd2204894179d89bd7b984072f19313b03:

  Linux 6.9-rc6 (2024-04-28 13:47:24 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git tags/cxl-fixes-6.9-rc7

for you to fetch changes up to 5d211c7090590033581175d6405ae40917ca3a06:

  cxl: Fix cxl_endpoint_get_perf_coordinate() support for RCH (2024-04-29 09:03:26 -0700)

----------------------------------------------------------------
cxl fix for v6.9-rc7

- Add missing RCH support for endpoint access_coordinate calculation

----------------------------------------------------------------
Dave Jiang (1):
      cxl: Fix cxl_endpoint_get_perf_coordinate() support for RCH

 drivers/cxl/core/port.c      | 15 ++++++++++++++-
 tools/testing/cxl/test/cxl.c |  7 +++++++
 2 files changed, 21 insertions(+), 1 deletion(-)