From accb9a7e87f096a12eb21256107b9c8e343f8019 Mon Sep 17 00:00:00 2001 From: KaFai Wan Date: Wed, 8 Oct 2025 18:26:27 +0800 Subject: selftests/bpf: Add test for unpinning htab with internal timer struct Add test to verify that unpinning hash tables containing internal timer structures does not trigger context warnings. Each subtest (timer_prealloc and timer_no_prealloc) can trigger the context warning when unpinning, but the warning cannot be triggered twice within a short time interval (a HZ), which is expected behavior. Signed-off-by: KaFai Wan Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20251008102628.808045-3-kafai.wan@linux.dev Signed-off-by: Alexei Starovoitov --- .../selftests/bpf/prog_tests/pinning_htab.c | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/pinning_htab.c (limited to 'tools/testing/selftests/bpf/prog_tests') diff --git a/tools/testing/selftests/bpf/prog_tests/pinning_htab.c b/tools/testing/selftests/bpf/prog_tests/pinning_htab.c new file mode 100644 index 000000000000..16bd74be3dbe --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/pinning_htab.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include "test_pinning_htab.skel.h" + +static void unpin_map(const char *map_name, const char *pin_path) +{ + struct test_pinning_htab *skel; + struct bpf_map *map; + int err; + + skel = test_pinning_htab__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel open_and_load")) + return; + + map = bpf_object__find_map_by_name(skel->obj, map_name); + if (!ASSERT_OK_PTR(map, "bpf_object__find_map_by_name")) + goto out; + + err = bpf_map__pin(map, pin_path); + if (!ASSERT_OK(err, "bpf_map__pin")) + goto out; + + err = bpf_map__unpin(map, pin_path); + ASSERT_OK(err, "bpf_map__unpin"); +out: + test_pinning_htab__destroy(skel); +} + +void test_pinning_htab(void) +{ + if (test__start_subtest("timer_prealloc")) + unpin_map("timer_prealloc", "/sys/fs/bpf/timer_prealloc"); + if (test__start_subtest("timer_no_prealloc")) + unpin_map("timer_no_prealloc", "/sys/fs/bpf/timer_no_prealloc"); +} -- cgit v1.2.3