From nobody Thu Apr 9 16:24:11 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C10183A4505; Sat, 7 Mar 2026 19:54:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772913247; cv=none; b=ZPniSyScOQa3UrgdXF1qe40Z+VvYPg67JwL7CaB2qbwecBcxtywVXDLSUXqZXzyHfosfAcw+WEPtdDnybGqMSlJvxp4l7b3n93jT85N9xdXIlwEde7NLQtLS1t37JN2zYOrh021lzh+B1MQ5W+Km+aNIJEAarAPLHJVQ6u4T8s8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772913247; c=relaxed/simple; bh=cHAWOwLABE0IuRjMJHLuZg8SBEg0KiVoUUFpxTrX+yc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=B2bPuHndV2WrLSZbpMCyFA9yaLXgadGqXxboFwOK0Q8ycQjvOJPmQM1VBufgb0ajoqGpWS6/uLQZbSd96M/AIS0oD/cBYJIOMEosYGX3lb4sTUMfKTJ6t+Dci1VRtYxuO7AFVX3xWPLqjVwKYdr2oK7HCnR61IDSVvsZ+Cd90qw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RrDLMqsi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RrDLMqsi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79C34C2BCB5; Sat, 7 Mar 2026 19:54:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772913247; bh=cHAWOwLABE0IuRjMJHLuZg8SBEg0KiVoUUFpxTrX+yc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RrDLMqsiYefqJ5d79fNnxVvcFSYtuDfZZZJ97LGdVq7EFv41zDhGggdm3+UyaSmxr PBOMZmxL2uVBPb9W16T3rkDri/sWtMjBRNITE3W2ZsiJpLLS3WMUrpNyhul7/r/AE5 ay6amn/VCsmnX1P3MXuSqH5Rhx505HaS2zABmsFN5D/kI5qMV7eGaYykqHmMfDZXqJ QzvGJFIN8DPHltAzVH62R2ibPehalNvmhc0V1L0pMKoMp8545eqMXpi4tSfkUKKjom mYo3L9c9Cpa02jP3NA/ssCK+or5eNXff2jYOyqPJ1vSCywS81h2qvbpfjXt8i5xyl3 5yE9/efUJBP1Q== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Brendan Higgins , David Gow , damon@lists.linux.dev, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/7] mm/damon/tests/core-kunit: add a test for damon_is_last_region() Date: Sat, 7 Mar 2026 11:53:50 -0800 Message-ID: <20260307195356.203753-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260307195356.203753-1-sj@kernel.org> References: <20260307195356.203753-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There was a bug [1] in damon_is_last_region(). Add a kunit test to not reintroduce the bug. [1] https://lore.kernel.org/20260114152049.99727-1-sj@kernel.org/ Signed-off-by: SeongJae Park Reviewed-by: wang lian Tested-by: wang lian --- mm/damon/tests/core-kunit.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index 2289f9e4610c0..e86d4f4fe261a 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -1311,6 +1311,28 @@ static void damon_test_apply_min_nr_regions(struct k= unit *test) damon_test_apply_min_nr_regions_for(test, 10, 2, 10, 2, 5); } =20 +static void damon_test_is_last_region(struct kunit *test) +{ + struct damon_region *r; + struct damon_target *t; + int i; + + t =3D damon_new_target(); + if (!t) + kunit_skip(test, "target alloc fail\n"); + + for (i =3D 0; i < 4; i++) { + r =3D damon_new_region(i * 2, (i + 1) * 2); + if (!r) { + damon_free_target(t); + kunit_skip(test, "region alloc %d fail\n", i); + } + damon_add_region(r, t); + KUNIT_EXPECT_TRUE(test, damon_is_last_region(r, t)); + } + damon_free_target(t); +} + static struct kunit_case damon_test_cases[] =3D { KUNIT_CASE(damon_test_target), KUNIT_CASE(damon_test_regions), @@ -1339,6 +1361,7 @@ static struct kunit_case damon_test_cases[] =3D { KUNIT_CASE(damon_test_feed_loop_next_input), KUNIT_CASE(damon_test_set_filters_default_reject), KUNIT_CASE(damon_test_apply_min_nr_regions), + KUNIT_CASE(damon_test_is_last_region), {}, }; =20 --=20 2.47.3