From nobody Wed Dec 17 19:17:00 2025 Received: from out-189.mta0.migadu.com (out-189.mta0.migadu.com [91.218.175.189]) (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 23CA227A929 for ; Fri, 3 Oct 2025 08:47:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.189 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759481238; cv=none; b=TfU0481Zcuf91KxKqaIYAgFJBQEVAk+ugLQSHHPRMnJqbA9hoZ4jDP57PNOWu51ggUyp+BJjpAAbyOrBHmUyGtUD9jLm95LbvNWNI6/+TdHAmaVpW7AtNvy8lmHfebWuAB5j2LcZMHyKLKeonLY1czESkeJpMgNEZMT/+OyGUgw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759481238; c=relaxed/simple; bh=XLodWl1Mnqi6n+xmZaM4r4KxwmmAoji2W6kZJLMVLA8=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qy96/zeVsQWPcv544LAR07azUGtfTPH+p6k260257N/mDuXEoF6+1bxEd1mIyz22Z7qaNIqfShGhSYDSVBHdLtsg1mR4hybZeMCiVf+f/P7nvaKomG3ajJ7cOTBjdthhMu9TYSxehQwuhRbZJTXPanRqWpkKTmjHGTdTaamkkeI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=uUksfYjQ; arc=none smtp.client-ip=91.218.175.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="uUksfYjQ" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1759481235; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CZM6bExjDs8jz6TVsKvY1N151Suvl2rvzQSjV8ALYIE=; b=uUksfYjQzFzSy+jIUVRgc1r4bn38I5hd+45qOv9/mdFxrvxzk9fcv6zH0laC2n+GqUwYYK LkUwLZKnFojni7xbzvB9JkN87RKhExIzunDQfsiFzpCqzTXr8rFazFgRGqVbh9NlKL6jqy GuCU2BX8K3WYSi4giFgDNlfM4rFjHUA= From: KaFai Wan To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, kafai.wan@linux.dev, toke@redhat.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf 2/2] selftests/bpf: Add test for unpinning htab with internal timer struct Date: Fri, 3 Oct 2025 16:45:28 +0800 Message-ID: <20251003084528.502518-3-kafai.wan@linux.dev> In-Reply-To: <20251003084528.502518-1-kafai.wan@linux.dev> References: <20251003084528.502518-1-kafai.wan@linux.dev> 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 X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" 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 --- .../selftests/bpf/prog_tests/pinning_htab.c | 37 +++++++++++++++++++ .../selftests/bpf/progs/test_pinning_htab.c | 25 +++++++++++++ 2 files changed, 62 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/pinning_htab.c create mode 100644 tools/testing/selftests/bpf/progs/test_pinning_htab.c 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..fc804bb87b26 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/pinning_htab.c @@ -0,0 +1,37 @@ +// 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 =3D test_pinning_htab__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel open_and_load")) + return; + + map =3D bpf_object__find_map_by_name(skel->obj, map_name); + if (!ASSERT_OK_PTR(map, "bpf_object__find_map_by_name")) + goto out; + + err =3D bpf_map__pin(map, pin_path); + if (!ASSERT_OK(err, "bpf_map__pin")) + goto out; + + err =3D bpf_map__unpin(map, pin_path); + if (!ASSERT_OK(err, "bpf_map__unpin")) + goto out; +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"); +} diff --git a/tools/testing/selftests/bpf/progs/test_pinning_htab.c b/tools/= testing/selftests/bpf/progs/test_pinning_htab.c new file mode 100644 index 000000000000..ae227930c73c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_pinning_htab.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "vmlinux.h" +#include + +char _license[] SEC("license") =3D "GPL"; + +struct timer_val { + struct bpf_timer timer; +}; + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __type(key, __u32); + __type(value, struct timer_val); + __uint(max_entries, 1); +} timer_prealloc SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __type(key, __u32); + __type(value, struct timer_val); + __uint(max_entries, 1); + __uint(map_flags, BPF_F_NO_PREALLOC); +} timer_no_prealloc SEC(".maps"); --=20 2.43.0