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Tue, 26 Aug 2025 00:21:25 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, usamaarif642@gmail.com, gutierrez.asier@huawei-partners.com, willy@infradead.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, Yafang Shao Subject: [PATCH v6 mm-new 07/10] selftests/bpf: add test case to update thp policy Date: Tue, 26 Aug 2025 15:19:45 +0800 Message-Id: <20250826071948.2618-8-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20250826071948.2618-1-laoar.shao@gmail.com> References: <20250826071948.2618-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit EBUSY is returned when attempting to install a new BPF program while one is already running, though updates to existing programs are permitted. Signed-off-by: Yafang Shao --- .../selftests/bpf/prog_tests/thp_adjust.c | 23 +++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/thp_adjust.c b/tools/testing/selftests/bpf/prog_tests/thp_adjust.c index bf367c6e6f52..6e65d7b0eb80 100644 --- a/tools/testing/selftests/bpf/prog_tests/thp_adjust.c +++ b/tools/testing/selftests/bpf/prog_tests/thp_adjust.c @@ -227,6 +227,27 @@ static void subtest_thp_fork(void) bpf_link__destroy(ops_link); } +static void subtest_thp_policy_update(void) +{ + struct bpf_link *old_link, *new_link; + int err; + + old_link = bpf_map__attach_struct_ops(skel->maps.thp_fork_ops); + if (!ASSERT_OK_PTR(old_link, "attach_old_link")) + return; + + new_link = bpf_map__attach_struct_ops(skel->maps.khugepaged_ops); + if (!ASSERT_NULL(new_link, "attach_new_link")) + goto destory_old; + ASSERT_EQ(errno, EBUSY, "attach_new_link"); + + err = bpf_link__update_map(old_link, skel->maps.khugepaged_ops); + ASSERT_EQ(err, 0, "update_old_link"); + +destory_old: + bpf_link__destroy(old_link); +} + static int thp_adjust_setup(void) { int err, cgrp_fd, cgrp_id, pmd_order; @@ -308,6 +329,8 @@ void test_thp_adjust(void) subtest_thp_policy(); if (test__start_subtest("khugepaged_fork")) subtest_thp_fork(); + if (test__start_subtest("policy_update")) + subtest_thp_policy_update(); thp_adjust_destroy(); } -- 2.47.3