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The Linux kernel configuration item CONFIG_CXL_ACPI
:
( CONFIG_ACPI ) && ( CONFIG_ACPI_NUMA )
cxl_acpi
Enable support for host managed device memory (HDM) resources published by a platform's ACPI CXL memory layout description. See Chapter 9.14.1 CXL Early Discovery Table (CEDT) in the CXL 2.0 specification, and CXL Fixed Memory Window Structures (CEDT.CFMWS) (https://www.computeexpresslink.org/spec-landing). The CXL core consumes these resource to publish the root of a cxl_port decode hierarchy to map regions that represent System RAM, or Persistent Memory regions to be managed by LIBNVDIMM.
If unsure say 'm'.
Raw data from LKDDb:
lkddb acpi "ACPI0017" : CONFIG_CXL_ACPI : drivers/cxl/acpi.c # in 5.19, 6.0–6.11
lkddb acpi "ACPI0017" : CONFIG_CXL_ACPI CONFIG_CXL_BUS : drivers/cxl/acpi.c # in 5.14–5.18, 5.18+HEAD
lkddb module cxl_acpi CONFIG_CXL_ACPI : drivers/cxl/Kconfig : "CXL ACPI: Platform Support" # in 5.14–5.19, 6.0–6.11
lkddb platform "" : CONFIG_CXL_ACPI : drivers/cxl/acpi.c # in 5.19, 6.0–6.11
lkddb platform "" : CONFIG_CXL_ACPI CONFIG_CXL_BUS : drivers/cxl/acpi.c # in 5.14–5.18, 5.18+HEAD
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Automatically generated (in year 2024). See also LKDDb sources on GitLab