Changes in hmem_test.c

12bffaef28820e0b94c644c75708195c61af78f7 - Merge tag 'cxl-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

Sat, 18 Apr 2026 00:52:58 +0200

Merge tag 'cxl-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxlPull CXL (Compute Express Link) updates from Dave Jiang: "The significant change of interest is the handling of soft reserved memory conflict between CXL and HMEM. In essence CXL will be the first to claim the soft reserved memory ranges that belongs to CXL and attempt to enumerate them with best effort. If CXL is not able to enumerate the ranges it will punt them to HMEM. There are also MAINTAINERS email changes from Dan Williams and Jonathan Cameron"* tag 'cxl-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (37 commits) MAINTAINERS: Update Jonathan Cameron's email address cxl/hdm: Add support for 32 switch decoders MAINTAINERS: Update address for Dan Williams tools/testing/cxl: Enable replay of user regions as auto regions cxl/region: Add a region sysfs interface for region lock status tools/testing/cxl: Test dax_hmem takeover of CXL regions tools/testing/cxl: Simulate auto-assembly failure dax/hmem: Parent dax_hmem devices dax/hmem: Fix singleton confusion between dax_hmem_work and hmem devices dax/hmem: Reduce visibility of dax_cxl coordination symbols cxl/region: Constify cxl_region_resource_contains() cxl/region: Limit visibility of cxl_region_contains_resource() dax/cxl: Fix HMEM dependencies cxl/region: Fix use-after-free from auto assembly failure cxl/core: Check existence of cxl_memdev_state in poison test cxl/core: use cleanup.h for devm_cxl_add_dax_region cxl/core/region: move dax region device logic into region_dax.c cxl/core/region: move pmem region driver logic into region_pmem.c dax/hmem, cxl: Defer and resolve Soft Reserved ownership cxl/region: Add helper to check Soft Reserved containment by CXL regions ... List of files: /linux/tools/testing/cxl/test/hmem_test.c

303d32843b831ba86c28aea188db95da65d88f31 - Merge branch 'for-7.1/dax-hmem' into cxl-for-next

Fri, 03 Apr 2026 21:21:27 +0200

Merge branch 'for-7.1/dax-hmem' into cxl-for-nextThe series addresses conflicts between HMEM and CXL when handling SoftReserved memory ranges. CXL will try best effort in claiming the SoftReserved memory region that are CXL regions. If fails, it will puntback to HMEM.tools/testing/cxl: Test dax_hmem takeover of CXL regionstools/testing/cxl: Simulate auto-assembly failuredax/hmem: Parent dax_hmem devicesdax/hmem: Fix singleton confusion between dax_hmem_work and hmem devicesdax/hmem: Reduce visibility of dax_cxl coordination symbolscxl/region: Constify cxl_region_resource_contains()cxl/region: Limit visibility of cxl_region_contains_resource()dax/cxl: Fix HMEM dependenciescxl/region: Fix use-after-free from auto assembly failuredax/hmem, cxl: Defer and resolve Soft Reserved ownershipcxl/region: Add helper to check Soft Reserved containment by CXL regionsdax: Track all dax_region allocations under a global resource treedax/cxl, hmem: Initialize hmem early and defer dax_cxl bindingdax/hmem: Gate Soft Reserved deferral on DEV_DAX_CXLdax/hmem: Request cxl_acpi and cxl_pci before walking Soft Reserved rangesdax/hmem: Factor HMEM registration into __hmem_register_device()dax/bus: Use dax_region_put() in alloc_dax_region() error path List of files: /linux/tools/testing/cxl/test/hmem_test.c

549b5c12ef06441dbde4718f16e23c547f5592d7 - tools/testing/cxl: Test dax_hmem takeover of CXL regions

Fri, 27 Mar 2026 06:28:21 +0100

tools/testing/cxl: Test dax_hmem takeover of CXL regionsWhen platform firmware is committed to publishing EFI_CONVENTIONAL_MEMORYin the memory map, but CXL fails to assemble the region, dax_hmem canattempt to attach a dax device to the memory range.Take advantage of the new ability to support multiple "hmem_platform"devices, and to enable regression testing of several scenarios:* CXL correctly assembles a region, check dax_hmem fails to attach dax* CXL fails to assemble a region, check dax_hmem successfully attaches dax* Check that loading the dax_cxl driver loads the dax_hmem driver* Attempt to race cxl_mock_mem async probe vs dax_hmem probe flushing. Check that both positive and negative cases.Signed-off-by: Dan Williams Reviewed-by: Ira Weiny Reviewed-by: Dave Jiang Reviewed-by: Alison Schofield Tested-by: Alison Schofield Link: https://patch.msgid.link/20260327052821.440749-10-dan.j.williams@intel.comSigned-off-by: Dave Jiang List of files: /linux/tools/testing/cxl/test/hmem_test.c