linux/mm/damon/tests, branch master

mm/damon/tests/core-kunit: test goal_tuner commit

2026-04-05T20:53:26Z

Extend damos_commit_quota() kunit test for the newly added goal_tuner parameter. Link: https://lkml.kernel.org/r/20260310010529.91162-9-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/tests/core-kunit: add a test for damon_is_last_region()

2026-04-05T20:53:22Z

There was a bug [1] in damon_is_last_region(). Add a kunit test to not reintroduce the bug. Link: https://lkml.kernel.org/r/20260307195356.203753-3-sj@kernel.org Link: https://lore.kernel.org/20260114152049.99727-1-sj@kernel.org/ [1] Signed-off-by: SeongJae Park Tested-by: wang lian Reviewed-by: wang lian Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

mm/damon/tests/core-kunit: add a test for damon_commit_ctx()

2026-04-05T20:53:21Z

Patch series "mm/damon: test and document power-of-2 min_region_sz requirement". Since commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz"), min_region_sz is always restricted to be a power of two. Add a kunit test to confirm the functionality. Also, the change adds a restriction to addr_unit parameter. Clarify it on the document. This patch (of 2): Add a kunit test for confirming the change that is made on commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") functions as expected. Link: https://lkml.kernel.org/r/20260307194222.202075-2-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: SeongJae Park Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton

mm/damon/tests/.kunitconifg: enable DAMON_DEBUG_SANITY

2026-04-05T20:53:21Z

CONFIG_DAMON_DEBUG_SANITY is recommended for DAMON development and test setups. Enable it on the default configurations for DAMON kunit test run. Link: https://lkml.kernel.org/r/20260306152914.86303-10-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Cc: Shuah Khan Signed-off-by: Andrew Morton

mm/damon/test/core-kunit: add damon_apply_min_nr_regions() test

2026-04-05T20:53:11Z

Add a kunit test for the functionality of damon_apply_min_nr_regions(). Link: https://lkml.kernel.org/r/20260228222831.7232-4-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Signed-off-by: Andrew Morton

mm/damon/vaddr: do not split regions for min_nr_regions

2026-04-05T20:53:11Z

The previous commit made DAMON core split regions at the beginning for min_nr_regions. The virtual address space operation set (vaddr) does similar work on its own, for a case user delegates entire initial monitoring regions setup to vaddr. It is unnecessary now, as DAMON core will do similar work for any case. Remove the duplicated work in vaddr. Also, remove a helper function that was being used only for the work, and the test code of the helper function. Link: https://lkml.kernel.org/r/20260228222831.7232-3-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Signed-off-by: Andrew Morton

Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses

2026-02-22T16:26:33Z

Conversion performed via this Coccinelle script: // SPDX-License-Identifier: GPL-2.0-only // Options: --include-headers-for-types --all-includes --include-headers --keep-comments virtual patch @gfp depends on patch && !(file in "tools") && !(file in "samples")@ identifier ALLOC = {kmalloc_obj,kmalloc_objs,kmalloc_flex, kzalloc_obj,kzalloc_objs,kzalloc_flex, kvmalloc_obj,kvmalloc_objs,kvmalloc_flex, kvzalloc_obj,kvzalloc_objs,kvzalloc_flex}; @@ ALLOC(... - , GFP_KERNEL ) $ make coccicheck MODE=patch COCCI=gfp.cocci Build and boot tested x86_64 with Fedora 42's GCC and Clang: Linux version 6.19.0+ (user@host) (gcc (GCC) 15.2.1 20260123 (Red Hat 15.2.1-7), GNU ld version 2.44-12.fc42) #1 SMP PREEMPT_DYNAMIC 1970-01-01 Linux version 6.19.0+ (user@host) (clang version 20.1.8 (Fedora 20.1.8-4.fc42), LLD 20.1.8) #1 SMP PREEMPT_DYNAMIC 1970-01-01 Signed-off-by: Kees Cook Signed-off-by: Linus Torvalds

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-22T04:03:00Z

This converts some of the visually simpler cases that have been split over multiple lines. I only did the ones that are easy to verify the resulting diff by having just that final GFP_KERNEL argument on the next line. Somebody should probably do a proper coccinelle script for this, but for me the trivial script actually resulted in an assertion failure in the middle of the script. I probably had made it a bit _too_ trivial. So after fighting that far a while I decided to just do some of the syntactically simpler cases with variations of the previous 'sed' scripts. The more syntactically complex multi-line cases would mostly really want whitespace cleanup anyway. Signed-off-by: Linus Torvalds

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

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

mm/damon: rename DAMON_MIN_REGION to DAMON_MIN_REGION_SZ

2026-01-31T22:22:46Z

The macro is for the default minimum size of each DAMON region. There was a case that a reader was confused if it is the minimum number of total DAMON regions, which is set on damon_attrs->min_nr_regions. Make the name more explicit. Link: https://lkml.kernel.org/r/20260117175256.82826-8-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton