kernel/linux.git/lib/test_kho.c, branch v7.0-rc7

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

kho: test: clean up residual memory upon test_kho module unload

2026-01-27T03:07:13+00:00

During the initialization phase, the test_kho module invokes the kho_preserve_folio function, which internally configures bitmaps within kho_mem_track and establishes chunk linked lists in KHO. Upon unloading the test_kho module, it is necessary to clean up these states. Link: https://lkml.kernel.org/r/20260107022427.4114424-1-longwei27@huawei.com Signed-off-by: Long Wei Acked-by: Mike Rapoport (Microsoft) Cc: Alexander Graf Cc: hewenliang Cc: Pasha Tatashin Cc: Pratyush Yadav Signed-off-by: Andrew Morton

kho: relocate vmalloc preservation structure to KHO ABI header

2026-01-27T03:07:12+00:00

The `struct kho_vmalloc` defines the in-memory layout for preserving vmalloc regions across kexec. This layout is a contract between kernels and part of the KHO ABI. To reflect this relationship, the related structs and helper macros are relocated to the ABI header, `include/linux/kho/abi/kexec_handover.h`. This move places the structure's definition under the protection of the KHO_FDT_COMPATIBLE version string. The structure and its components are now also documented within the ABI header to describe the contract and prevent ABI breaks. [rppt@kernel.org: update comment, per Pratyush] Link: https://lkml.kernel.org/r/aW_Mqp6HcqLwQImS@kernel.org Link: https://lkml.kernel.org/r/20260105165839.285270-6-rppt@kernel.org Signed-off-by: Jason Miu Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Cc: Alexander Graf Cc: Jonathan Corbet Cc: Pasha Tatashin Cc: Pratyush Yadav Signed-off-by: Andrew Morton

test_kho: always print restore status

2025-11-27T22:24:42+00:00

Currently the KHO test only prints a message on success, and remains silent on failure. This makes it difficult to notice a failing test. A failing test is usually more interesting than a successful one. Always print the test status after attempting restore. Link: https://lkml.kernel.org/r/20251118181046.23321-1-pratyush@kernel.org Signed-off-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Acked-by: SeongJae Park Cc: Alexander Graf Cc: Pratyush Yadav Signed-off-by: Andrew Morton

test_kho: unpreserve memory in case of error

2025-11-27T22:24:32+00:00

If there is an error half way through KHO memory preservation, we should rollback and unpreserve everything that is partially preserved. Link: https://lkml.kernel.org/r/20251101142325.1326536-6-pasha.tatashin@soleen.com Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Signed-off-by: Pasha Tatashin Cc: Alexander Graf Cc: Changyuan Lyu Cc: Christian Brauner Cc: Jason Gunthorpe Cc: Jason Gunthorpe Cc: Jonathan Corbet Cc: Masahiro Yamada Cc: Miguel Ojeda Cc: Pratyush Yadav Cc: Randy Dunlap Cc: Simon Horman Cc: Tejun Heo Cc: Zhu Yanjun Signed-off-by: Andrew Morton

kho: drop notifiers

2025-11-27T22:24:32+00:00

The KHO framework uses a notifier chain as the mechanism for clients to participate in the finalization process. While this works for a single, central state machine, it is too restrictive for kernel-internal components like pstore/reserve_mem or IMA. These components need a simpler, direct way to register their state for preservation (e.g., during their initcall) without being part of a complex, shutdown-time notifier sequence. The notifier model forces all participants into a single finalization flow and makes direct preservation from an arbitrary context difficult. This patch refactors the client participation model by removing the notifier chain and introducing a direct API for managing FDT subtrees. The core kho_finalize() and kho_abort() state machine remains, but clients now register their data with KHO beforehand. Link: https://lkml.kernel.org/r/20251101142325.1326536-3-pasha.tatashin@soleen.com Signed-off-by: Mike Rapoport (Microsoft) Co-developed-by: Pasha Tatashin Signed-off-by: Pasha Tatashin Cc: Alexander Graf Cc: Changyuan Lyu Cc: Christian Brauner Cc: Jason Gunthorpe Cc: Jason Gunthorpe Cc: Jonathan Corbet Cc: Masahiro Yamada Cc: Miguel Ojeda Cc: Pratyush Yadav Cc: Randy Dunlap Cc: Simon Horman Cc: Tejun Heo Cc: Zhu Yanjun Signed-off-by: Andrew Morton

lib/test_kho: check if KHO is enabled

2025-11-15T18:52:01+00:00

We must check whether KHO is enabled prior to issuing KHO commands, otherwise KHO internal data structures are not initialized. Link: https://lkml.kernel.org/r/20251106220635.2608494-1-pasha.tatashin@soleen.com Fixes: b753522bed0b ("kho: add test for kexec handover") Signed-off-by: Pasha Tatashin Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202511061629.e242724-lkp@intel.com Reviewed-by: Pratyush Yadav Reviewed-by: Mike Rapoport (Microsoft) Cc: Alexander Graf Cc: Signed-off-by: Andrew Morton

lib/test_kho: use kho_preserve_vmalloc instead of storing addresses in fdt

2025-10-07T20:48:56+00:00

KHO test stores physical addresses of the preserved folios directly in fdt. Use kho_preserve_vmalloc() instead of it and kho_restore_vmalloc() to retrieve the addresses after kexec. This makes the test more scalable from one side and adds tests coverage for kho_preserve_vmalloc() from the other. Link: https://lkml.kernel.org/r/20250921054458.4043761-5-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Pratyush Yadav Cc: Alexander Graf Cc: Baoquan He Cc: Changyuan Lyu Cc: Chris Li Cc: Jason Gunthorpe Cc: Pasha Tatashin Signed-off-by: Andrew Morton

lib/test_kho: fixes for error handling

2025-09-13T23:54:55+00:00

* Update kho_test_save() so that folios array won't be freed when returning from the function and the fdt will be freed on error * Reset state->nr_folios to 0 in kho_test_generate_data() on error * Simplify allocation of folios info in fdt. Link: https://lkml.kernel.org/r/20250811082510.4154080-3-rppt@kernel.org Fixes: b753522bed0b ("kho: add test for kexec handover") Signed-off-by: Mike Rapoport (Microsoft) Reported-by: Pratyush Yadav Closes: https://lore.kernel.org/all/mafs0zfcjcepf.fsf@kernel.org Reviewed-by: Pratyush Yadav Cc: Alexander Graf Cc: Baoquan He Cc: Changyuan Lyu Cc: Pasha Tatashin Cc: Shuah Khan Cc: Thomas Weißschuh Signed-off-by: Andrew Morton