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Some architectures (e.g. arm64) only support memory hotplug operations on a restricted set of physical addresses. This applies even when we are faking some CXL fixed memory windows for the purposes of cxl_test. That range can be queried with mhp_get_pluggable_range(true). Use the minimum of that the top of that range and iomem_resource.end to establish the 64GiB region used by cxl_test. From thread #2 which was related to the issue in #1. [ dj: Add CONFIG_MEMORY_HOTPLUG config check, from Alison ] Link: https://lore.kernel.org/linux-cxl/20250522145622.00002633@huawei.com/ #2 Reported-by: Itaru Kitayama <itaru.kitayama@linux.dev> Closes: https://github.com/pmem/ndctl/issues/278 #1 Reviewed-by: Dan Williams <dan.j.williams@intel.com> Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com <mailto:itaru.kitayama@fujitsu.com> Tested-by: Marc Herbert <marc.herbert@linux.intel.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://patch.msgid.link/20250527153451.82858-1-Jonathan.Cameron@huawei.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.