From nobody Fri Dec 19 17:56:15 2025 Received: from mail-oi1-f201.google.com (mail-oi1-f201.google.com [209.85.167.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1582C202F70 for ; Fri, 5 Dec 2025 00:58:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764896331; cv=none; b=rEbO4RU/QmObtUpQoNqIRx0xaYBFqRD+9t3SQr4EBNgq5G5NOmTVYzy6dhBB7aPXX6bORZ+B97z9hOQ5R9AsMluEZ8OmaSIWMvtXk2yT8vF7QUykyaMzLpkmjGJYC9VaKotKi8cKZCLhUQYg1+SscS0nAIvJNPd36ZCABKlyHuY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764896331; c=relaxed/simple; bh=UvSln048ohPOzbLPJhvVxAZd+2oA+tXy8HJRgRIhYLo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YlgOKY6bUlo+aS5qiav0p8CO/BzlbJtRmxATgTicGCh8oTMesif8a+ZcUglQ0C9W7wij06pFSO1HzsE8U+DGxfH2mbS6/9w7O1bB8trUJLe/mxIxPTPtTcy89/NLjc+4pOcjq5MutMFkhNcYwE0IC9vrvFYL1zMlaGM1obJqZ4A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--avagin.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RYIksOdr; arc=none smtp.client-ip=209.85.167.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--avagin.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RYIksOdr" Received: by mail-oi1-f201.google.com with SMTP id 5614622812f47-451064d84edso452099b6e.3 for ; Thu, 04 Dec 2025 16:58:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1764896328; x=1765501128; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=K6yuyWg6J+6tRA6+qXQKoG2t2/jCR8bZmCcJlfiuOoE=; b=RYIksOdrOrb/vLo5JbUXC4JyB44TEW/Z6+ubFEpyQI+jC97o6S6q41NqHwvlISfDy1 ytuGWjMqqfkzzl4YcBcr17C2P4l3nTTuAzrNH2+AkVa4D85xGQ64Tj3FhDGwnok1bzuM WDTPblnkY+T5UXIhIsqiHjc7dbcT8PmswhFF1vY0t1GC+CemR+omJRqF9spBlbCJTnDN M/hwHsC5ZZI4OVPCN4sGND6FqeqneQztCJ44XFmSd8+cGnJlHOZAlC4t6ccY4k7mr25t 3TtH19JUu6paKfwWwn0QhS/uNjiICrYq2UG3nzDgsdHzWrgq1pWNTnp8JAvNdXL/WL0j V6UA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764896328; x=1765501128; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=K6yuyWg6J+6tRA6+qXQKoG2t2/jCR8bZmCcJlfiuOoE=; b=OKheRuHHY/wmECfzey3ZDNUAZF7uVxvfpXTFHzQ4kueoJxHdT+wKa336zHEH8ku1MB WGGEKtEeVGLUoOhrIjRty2GcYVuyur5NM7NTxCZnh3bi9Sz0HYDzmRz2GEvyRAoZ9IIp vtYr/D0QHfyIFLZIh+tVKaIulyzLwT3kFl/CWLuIGiWVVXhgcdZZsRsKPzF+WfOREl5l acXuLuiYozO8MwqPY6gIOPN2IqNiuh0HmYg/wg43+DN1Rh8mVdzROoqtL18hr4/At2PN L1GF+yyKWAuEzolm2ZW32qL2XCDxdv0kDgT6VRVGlUw+KIg8ZNZrqq0RBitDJgSPudqX RsSw== X-Gm-Message-State: AOJu0YzZn2x8KDLrmFjl+W4cUbKjwQj8FOWkk8Ht7GYFlyc8Y64FEEgz cl6FUleuH2WIrAg8ZWMPGmE8t5yOVbNHsYmEyZx7F/xQlc5tlApuq5qmnxtIikooMi/YfHoru3T P4aMJiQ== X-Google-Smtp-Source: AGHT+IFADxKy/vFest5snAc0m/D0WWFhbz7XE0sMmrJDgeiYPmoKVCscGluChmmNgyVRHEbkPAnHLRJv63w= X-Received: from ioxv4.prod.google.com ([2002:a05:6602:584:b0:948:a326:e2d6]) (user=avagin job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6808:1899:b0:450:d09a:8ce7 with SMTP id 5614622812f47-45379cc4f26mr2830491b6e.20.1764896328239; Thu, 04 Dec 2025 16:58:48 -0800 (PST) Date: Fri, 5 Dec 2025 00:58:31 +0000 In-Reply-To: <20251205005841.3942668-1-avagin@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251205005841.3942668-1-avagin@google.com> X-Mailer: git-send-email 2.52.0.223.gf5cc29aaa4-goog Message-ID: <20251205005841.3942668-4-avagin@google.com> Subject: [PATCH 2/3] selftests/cgroup: Add a test for the misc.mask cgroup interface From: Andrei Vagin To: Kees Cook Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, criu@lists.linux.dev, Tejun Heo , Johannes Weiner , "=?UTF-8?q?Michal=20Koutn=C3=BD?=" , Vipin Sharma , Jonathan Corbet , Andrei Vagin Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a selftest for the misc.mask cgroup interface. The test verifies that the misc.mask file is present and has the correct default value, that it is possible to write a new mask to the file, and that the mask is inherited by sub-cgroups. Signed-off-by: Andrei Vagin --- tools/testing/selftests/cgroup/.gitignore | 1 + tools/testing/selftests/cgroup/Makefile | 2 + tools/testing/selftests/cgroup/config | 1 + tools/testing/selftests/cgroup/test_misc.c | 118 +++++++++++++++++++++ 4 files changed, 122 insertions(+) create mode 100644 tools/testing/selftests/cgroup/test_misc.c diff --git a/tools/testing/selftests/cgroup/.gitignore b/tools/testing/self= tests/cgroup/.gitignore index 952e4448bf07..3ced02a3634b 100644 --- a/tools/testing/selftests/cgroup/.gitignore +++ b/tools/testing/selftests/cgroup/.gitignore @@ -7,6 +7,7 @@ test_hugetlb_memcg test_kill test_kmem test_memcontrol +test_misc test_pids test_zswap wait_inotify diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selfte= sts/cgroup/Makefile index e01584c2189a..6e9e92f89d8a 100644 --- a/tools/testing/selftests/cgroup/Makefile +++ b/tools/testing/selftests/cgroup/Makefile @@ -15,6 +15,7 @@ TEST_GEN_PROGS +=3D test_hugetlb_memcg TEST_GEN_PROGS +=3D test_kill TEST_GEN_PROGS +=3D test_kmem TEST_GEN_PROGS +=3D test_memcontrol +TEST_GEN_PROGS +=3D test_misc TEST_GEN_PROGS +=3D test_pids TEST_GEN_PROGS +=3D test_zswap =20 @@ -31,5 +32,6 @@ $(OUTPUT)/test_hugetlb_memcg: $(LIBCGROUP_O) $(OUTPUT)/test_kill: $(LIBCGROUP_O) $(OUTPUT)/test_kmem: $(LIBCGROUP_O) $(OUTPUT)/test_memcontrol: $(LIBCGROUP_O) +$(OUTPUT)/test_misc: $(LIBCGROUP_O) $(OUTPUT)/test_pids: $(LIBCGROUP_O) $(OUTPUT)/test_zswap: $(LIBCGROUP_O) diff --git a/tools/testing/selftests/cgroup/config b/tools/testing/selftest= s/cgroup/config index 39f979690dd3..9e3d03736f5a 100644 --- a/tools/testing/selftests/cgroup/config +++ b/tools/testing/selftests/cgroup/config @@ -1,6 +1,7 @@ CONFIG_CGROUPS=3Dy CONFIG_CGROUP_CPUACCT=3Dy CONFIG_CGROUP_FREEZER=3Dy +CONFIG_CGROUP_MISC=3Dy CONFIG_CGROUP_SCHED=3Dy CONFIG_MEMCG=3Dy CONFIG_PAGE_COUNTER=3Dy diff --git a/tools/testing/selftests/cgroup/test_misc.c b/tools/testing/sel= ftests/cgroup/test_misc.c new file mode 100644 index 000000000000..50e8acb51852 --- /dev/null +++ b/tools/testing/selftests/cgroup/test_misc.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include + +#include "../kselftest.h" +#include "cgroup_util.h" + +/* + * This test checks that misc.mask works correctly. + */ +static int test_misc_mask(const char *root) +{ + int ret =3D KSFT_FAIL; + char *cg_misc, *cg_misc_sub =3D NULL; + + cg_misc =3D cg_name(root, "misc_test"); + if (!cg_misc) + goto cleanup; + + cg_misc_sub =3D cg_name(root, "misc_test/sub"); + if (!cg_misc_sub) + goto cleanup; + + if (cg_create(cg_misc)) + goto cleanup; + + if (cg_read_strcmp(cg_misc, "misc.mask", + "AT_HWCAP\t0x00000000000000\t0x00000000000000\n")) + goto cleanup; + + if (cg_write(cg_misc, "misc.mask", "AT_HWCAP 0xf0000000000000")) + goto cleanup; + + if (cg_read_strcmp(cg_misc, "misc.mask", + "AT_HWCAP\t0xf0000000000000\t0xf0000000000000\n")) + goto cleanup; + + if (cg_write(cg_misc, "cgroup.subtree_control", "+misc")) + goto cleanup; + + if (cg_create(cg_misc_sub)) + goto cleanup; + + if (cg_read_strcmp(cg_misc_sub, "misc.mask", + "AT_HWCAP\t0x00000000000000\t0xf0000000000000\n")) + goto cleanup; + + if (cg_write(cg_misc_sub, "misc.mask", "AT_HWCAP 0x01000000000000")) + goto cleanup; + + if (cg_read_strcmp(cg_misc_sub, "misc.mask", + "AT_HWCAP\t0x01000000000000\t0xf1000000000000\n")) + goto cleanup; + + ret =3D KSFT_PASS; + +cleanup: + cg_enter_current(root); + cg_destroy(cg_misc_sub); + cg_destroy(cg_misc); + free(cg_misc); + free(cg_misc_sub); + + return ret; +} + +#define T(x) { x, #x } +struct misc_test { + int (*fn)(const char *root); + const char *name; +} tests[] =3D { + T(test_misc_mask), +}; +#undef T + +int main(int argc, char **argv) +{ + char root[PATH_MAX]; + + ksft_print_header(); + ksft_set_plan(ARRAY_SIZE(tests)); + if (cg_find_unified_root(root, sizeof(root), NULL)) + ksft_exit_skip("cgroup v2 isn't mounted\n"); + + /* + * Check that misc controller is available: + * misc is listed in cgroup.controllers + */ + if (cg_read_strstr(root, "cgroup.controllers", "misc")) + ksft_exit_skip("misc controller isn't available\n"); + + if (cg_read_strstr(root, "cgroup.subtree_control", "misc")) + if (cg_write(root, "cgroup.subtree_control", "+misc")) + ksft_exit_skip("Failed to set misc controller\n"); + + for (int i =3D 0; i < ARRAY_SIZE(tests); i++) { + switch (tests[i].fn(root)) { + case KSFT_PASS: + ksft_test_result_pass("%s\n", tests[i].name); + break; + case KSFT_SKIP: + ksft_test_result_skip("%s\n", tests[i].name); + break; + default: + ksft_test_result_fail("%s\n", tests[i].name); + break; + } + } + + ksft_finished(); +} --=20 2.52.0.223.gf5cc29aaa4-goog