Re: [RFC PATCH 1/6] mm/damon/tests/core-kunit: test damon_commit_filter()

[SJ Park <sj@kernel.org>]

On Wed, 29 Jul 2026 14:52:57 +0000 sashiko-bot@kernel.org wrote:

> Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
> - [Medium] The kunit test uses the wrong enum type `DAMOS_FILTER_TYPE_MEMCG` instead of `DAMON_FILTER_TYPE_MEMCG` when checking `src->type`, causing the `memcg_id` assertion to be silently skipped.
> --
> 
> --- Patch [1]: [RFC PATCH 1/6] mm/damon/tests/core-kunit: test damon_commit_filter() ---
> commit e16ea26a19f85858bdb608d81842e976d30c3270
> Author: SJ Park <sj@kernel.org>
> 
> mm/damon/tests/core-kunit: test damon_commit_filter()
>     
> Add kunit test to ensure damon_commit_filter() updates destination
> filter as expected for valid inputs.
> 
> > diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
> > index 4a536d41cdb2d..6cbe22accabfb 100644
> > --- a/mm/damon/tests/core-kunit.h
> > +++ b/mm/damon/tests/core-kunit.h
> > @@ -1306,6 +1306,45 @@ static void damon_test_commit_target_regions(struct kunit *test)
> 
> [ ... ]
> 
> > +static void damon_test_commit_filter_for(struct kunit *test,
> > +		struct damon_filter *dst, struct damon_filter *src)
> > +{
> > +	damon_commit_filter(dst, src);
> > +	KUNIT_EXPECT_EQ(test, dst->type, src->type);
> > +	KUNIT_EXPECT_EQ(test, dst->matching, src->matching);
> > +	KUNIT_EXPECT_EQ(test, dst->allow, src->allow);
> > +	switch (src->type) {
> > +	case DAMOS_FILTER_TYPE_MEMCG:
> > +		KUNIT_EXPECT_EQ(test, dst->memcg_id, src->memcg_id);
> > +		break;
> 
> [Severity: Medium]
> Will this case label ever be matched?
> 
> This code checks against DAMOS_FILTER_TYPE_MEMCG, but damon_test_commit_filter()
> below initializes the source filter with type DAMON_FILTER_TYPE_MEMCG.
> 
> Because of this mismatch, the switch statement falls through to the default
> case, and the test silently skips the assertion for memcg_id.

Good catch, I will fix.

> 
> > +	default:
> > +		break;
> > +	}
> > +}
> > +
> > +static void damon_test_commit_filter(struct kunit *test)
> > +{
> 
> [ ... ]
> 
> > +	damon_test_commit_filter_for(test, &dst,
> > +			&(struct damon_filter){
> > +			.type = DAMON_FILTER_TYPE_MEMCG,
> > +			.matching = false,
> > +			.allow = false,
> > +			.memcg_id = 123,
> > +			});
> > +}
> 
> -- 
> Sashiko AI review · https://sashiko.dev/#/patchset/20260729144738.90895-1-sj@kernel.org?part=1
> 


Thanks,
SJ