Re: [RFC PATCH 09/10] mm/damon/tests/.kunitconifg: enable DAMON_DEBUG_SANITY

[SeongJae Park <sj@kernel.org>]

On Sat, 21 Feb 2026 11:36:26 -0800 SeongJae Park <sj@kernel.org> wrote:

> CONFIG_DAMON_DEBUG_SANITY is recommended for DAMON development and test
> setups.  Enable it on the default configurations for DAMON kunit test
> run.
> 
> Signed-off-by: SeongJae Park <sj@kernel.org>
> ---
>  mm/damon/tests/.kunitconfig | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/damon/tests/.kunitconfig b/mm/damon/tests/.kunitconfig
> index 36a450f57b581..144d27e6ecc5c 100644
> --- a/mm/damon/tests/.kunitconfig
> +++ b/mm/damon/tests/.kunitconfig
> @@ -13,3 +13,6 @@ CONFIG_DAMON_VADDR_KUNIT_TEST=y
>  CONFIG_SYSFS=y
>  CONFIG_DAMON_SYSFS=y
>  CONFIG_DAMON_SYSFS_KUNIT_TEST=y
> +
> +# enable DAMON_DEBUG_SANITY to catch any bug
> +CONFIG_DAMON_DEBUG_SANITY=y

And this makes kunit for DAMON fails, like below.

'''
$ ./tools/testing/kunit/kunit.py run --kunitconfig mm/damon/tests/
[11:57:20] Configuring KUnit Kernel ...
Regenerating .config ...
Populating config with:
$ make ARCH=um O=.kunit olddefconfig
[11:57:24] Building KUnit Kernel ...
Populating config with:
$ make ARCH=um O=.kunit olddefconfig
Building with:
$ make all compile_commands.json scripts_gdb ARCH=um O=.kunit --jobs=8
ERROR:root:In file included from ../include/asm-generic/bug.h:7,
                 from ./arch/um/include/generated/asm/bug.h:1,
                 from ../arch/x86/include/asm/alternative.h:9,
                 from ../arch/x86/um/asm/barrier.h:6,
                 from ../include/linux/list.h:11,
                 from ../arch/um/include/linux/time-internal.h:9,
                 from ../arch/x86/um/asm/processor.h:4,
                 from ../include/linux/sched.h:13,
                 from ../include/linux/cgroup.h:12,
                 from ../include/linux/memcontrol.h:13,
                 from ../include/linux/damon.h:11,
                 from ../mm/damon/core.c:10:
../mm/damon/core.c: In function ‘damon_verify_new_region’:
../include/linux/once_lite.h:28:50: error: expected expression before ‘)’ token
   28 |                 bool __ret_do_once = !!(condition);                     \
      |                                                  ^
../include/asm-generic/bug.h:185:9: note: in expansion of macro ‘DO_ONCE_LITE_IF’
  185 |         DO_ONCE_LITE_IF(condition, WARN, 1, format)
      |         ^~~~~~~~~~~~~~~
../mm/damon/core.c:127:9: note: in expansion of macro ‘WARN_ONCE’
  127 |         WARN_ONCE();
      |         ^~~~~~~~~
'''

I changed BUG() to WARN_ONCE() on the last moment of this patch posting, so I
missed this failure.  I will fix this on the next revision.


Thanks,
SJ

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