From nobody Tue Apr 7 01:17:44 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 3831935F17C for ; Tue, 17 Mar 2026 09:25:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773739528; cv=none; b=C5Qv9uxCJjeCqVHtItGYPxG00PHZl+t3xJ7QZjVirTeqnoCobBNPtIZtd+ch+AtOT/zKxrrgQzukezihVODYMpGswD/R63bbEBhqyIsRjS9W0mG1cTZ8ebhPU0Cwo13y/n91ssHdBvH37tOPxK/B1Z5tTHnTAbiNeAPSnqeQivw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773739528; c=relaxed/simple; bh=KSXqUccS0vGS9Yucdj/P0P0q8GQUeasfjqx1kXhROCA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=UzeAYiiMdj8Y92g6AQ64xi24tx1ft4J2DFW2QjMY2i04SDlk4C7YjbyUdbYxIUu2CzHWDSdK6tqqBolaeAfg/HI24mgpVBaZrxzVoULTcUlwfYxNfRuc8MF78X3IgqqjY/6VWl+4iscy9B3MyKR5AUo46owgvMQP65kNaKAf9Vs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=IiNhg+T3; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IiNhg+T3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1773739526; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qWq1auirtZsMIPEJ33nm5DPWJ0FEd8YwZ+yePh9+/ac=; b=IiNhg+T3qJdp2bjPof8XonE1WYPWJ5sLH7uy3UFo7+KOa17kF1dlIe4N2L2bjr+42QCIIN rc8X7cOojoIiI9xc4SsyyD/V5VUImBT8qMquFW+ndXeGTnyH40G5zCp1ITQbUA0km/5qMy QeK92ZamNpw5sls+yvQzu99HN6Sj1qU= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-673-SXLi687jOPyypbNfsFOhsA-1; Tue, 17 Mar 2026 05:25:23 -0400 X-MC-Unique: SXLi687jOPyypbNfsFOhsA-1 X-Mimecast-MFC-AGG-ID: SXLi687jOPyypbNfsFOhsA_1773739520 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 221C4180034E; Tue, 17 Mar 2026 09:25:20 +0000 (UTC) Received: from [192.168.1.153] (unknown [10.45.224.69]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 38B271800576; Tue, 17 Mar 2026 09:25:11 +0000 (UTC) From: Albert Esteve Date: Tue, 17 Mar 2026 10:24:43 +0100 Subject: [PATCH v6 3/5] Add unit tests to verify that warning backtrace suppression works. Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260317-kunit_add_support-v6-3-dd22aeb3fe5d@redhat.com> References: <20260317-kunit_add_support-v6-0-dd22aeb3fe5d@redhat.com> In-Reply-To: <20260317-kunit_add_support-v6-0-dd22aeb3fe5d@redhat.com> To: Arnd Bergmann , Brendan Higgins , David Gow , Rae Moar , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jonathan Corbet , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, dri-devel@lists.freedesktop.org, workflows@vger.kernel.org, linux-doc@vger.kernel.org, Guenter Roeck , Linux Kernel Functional Testing , Dan Carpenter , Alessandro Carminati , Albert Esteve , Kees Cook X-Developer-Signature: v=1; a=ed25519-sha256; t=1773739485; l=5347; i=aesteve@redhat.com; s=20260303; h=from:subject:message-id; bh=aN8lhV9oV3+rqrJyEZpR/bhaV4YKkqadbu7CZzQ+IVY=; b=Y+j+a4oUFn8pUI2Wx852BBj0WfPjG2PWnZdJyZx4Odr8xpXK+2wvxX3ZSiY15RuV8KAe3qwgp EAAgh3YOlEiBoIlJT6LYYpZWYVaxfVCRRN7BY0c2rHUV5KVhBaV+Ntt X-Developer-Key: i=aesteve@redhat.com; a=ed25519; pk=YSFz6sOHd2L45+Fr8DIvHTi6lSIjhLZ5T+rkxspJt1s= X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 From: Guenter Roeck Add unit tests to verify that warning backtrace suppression works. If backtrace suppression does _not_ work, the unit tests will likely trigger unsuppressed backtraces, which should actually help to get the affected architectures / platforms fixed. Tested-by: Linux Kernel Functional Testing Acked-by: Dan Carpenter Reviewed-by: Kees Cook Signed-off-by: Guenter Roeck Signed-off-by: Alessandro Carminati Signed-off-by: Albert Esteve --- lib/kunit/Makefile | 3 + lib/kunit/backtrace-suppression-test.c | 109 +++++++++++++++++++++++++++++= ++++ 2 files changed, 112 insertions(+) diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile index fe177ff3ebdef..b2f2b8ada7b71 100644 --- a/lib/kunit/Makefile +++ b/lib/kunit/Makefile @@ -23,6 +23,9 @@ obj-$(if $(CONFIG_KUNIT),y) +=3D hooks.o \ =20 obj-$(CONFIG_KUNIT_TEST) +=3D kunit-test.o obj-$(CONFIG_KUNIT_TEST) +=3D platform-test.o +ifeq ($(CONFIG_KUNIT_SUPPRESS_BACKTRACE),y) +obj-$(CONFIG_KUNIT_TEST) +=3D backtrace-suppression-test.o +endif =20 # string-stream-test compiles built-in only. ifeq ($(CONFIG_KUNIT_TEST),y) diff --git a/lib/kunit/backtrace-suppression-test.c b/lib/kunit/backtrace-s= uppression-test.c new file mode 100644 index 0000000000000..524aecee0ee23 --- /dev/null +++ b/lib/kunit/backtrace-suppression-test.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for suppressing warning tracebacks + * + * Copyright (C) 2024, Guenter Roeck + * Author: Guenter Roeck + */ + +#include +#include + +static void backtrace_suppression_test_warn_direct(struct kunit *test) +{ + KUNIT_DEFINE_SUPPRESSED_WARNING(backtrace_suppression_test_warn_direct); + + KUNIT_START_SUPPRESSED_WARNING(backtrace_suppression_test_warn_direct); + WARN(1, "This backtrace should be suppressed"); + KUNIT_END_SUPPRESSED_WARNING(backtrace_suppression_test_warn_direct); + + KUNIT_EXPECT_EQ(test, + KUNIT_SUPPRESSED_WARNING_COUNT(backtrace_suppression_test_warn_direct),= 1); +} + +static void trigger_backtrace_warn(void) +{ + WARN(1, "This backtrace should be suppressed"); +} + +static void backtrace_suppression_test_warn_indirect(struct kunit *test) +{ + KUNIT_DEFINE_SUPPRESSED_WARNING(trigger_backtrace_warn); + + KUNIT_START_SUPPRESSED_WARNING(trigger_backtrace_warn); + trigger_backtrace_warn(); + KUNIT_END_SUPPRESSED_WARNING(trigger_backtrace_warn); + + KUNIT_EXPECT_EQ(test, KUNIT_SUPPRESSED_WARNING_COUNT(trigger_backtrace_wa= rn), 1); +} + +static void backtrace_suppression_test_warn_multi(struct kunit *test) +{ + KUNIT_DEFINE_SUPPRESSED_WARNING(trigger_backtrace_warn); + KUNIT_DEFINE_SUPPRESSED_WARNING(backtrace_suppression_test_warn_multi); + + KUNIT_START_SUPPRESSED_WARNING(backtrace_suppression_test_warn_multi); + KUNIT_START_SUPPRESSED_WARNING(trigger_backtrace_warn); + WARN(1, "This backtrace should be suppressed"); + trigger_backtrace_warn(); + KUNIT_END_SUPPRESSED_WARNING(trigger_backtrace_warn); + KUNIT_END_SUPPRESSED_WARNING(backtrace_suppression_test_warn_multi); + + KUNIT_EXPECT_EQ(test, + KUNIT_SUPPRESSED_WARNING_COUNT(backtrace_suppression_test_warn_multi), = 1); + KUNIT_EXPECT_EQ(test, + KUNIT_SUPPRESSED_WARNING_COUNT(trigger_backtrace_warn), 1); +} + +static void backtrace_suppression_test_warn_on_direct(struct kunit *test) +{ + KUNIT_DEFINE_SUPPRESSED_WARNING(backtrace_suppression_test_warn_on_direct= ); + + if (!IS_ENABLED(CONFIG_DEBUG_BUGVERBOSE) && !IS_ENABLED(CONFIG_KALLSYMS)) + kunit_skip(test, "requires CONFIG_DEBUG_BUGVERBOSE or CONFIG_KALLSYMS"); + + KUNIT_START_SUPPRESSED_WARNING(backtrace_suppression_test_warn_on_direct); + WARN_ON(1); + KUNIT_END_SUPPRESSED_WARNING(backtrace_suppression_test_warn_on_direct); + + KUNIT_EXPECT_EQ(test, + KUNIT_SUPPRESSED_WARNING_COUNT( + backtrace_suppression_test_warn_on_direct), 1); +} + +static void trigger_backtrace_warn_on(void) +{ + WARN_ON(1); +} + +static void backtrace_suppression_test_warn_on_indirect(struct kunit *test) +{ + KUNIT_DEFINE_SUPPRESSED_WARNING(trigger_backtrace_warn_on); + + if (!IS_ENABLED(CONFIG_DEBUG_BUGVERBOSE)) + kunit_skip(test, "requires CONFIG_DEBUG_BUGVERBOSE"); + + KUNIT_START_SUPPRESSED_WARNING(trigger_backtrace_warn_on); + trigger_backtrace_warn_on(); + KUNIT_END_SUPPRESSED_WARNING(trigger_backtrace_warn_on); + + KUNIT_EXPECT_EQ(test, KUNIT_SUPPRESSED_WARNING_COUNT(trigger_backtrace_wa= rn_on), 1); +} + +static struct kunit_case backtrace_suppression_test_cases[] =3D { + KUNIT_CASE(backtrace_suppression_test_warn_direct), + KUNIT_CASE(backtrace_suppression_test_warn_indirect), + KUNIT_CASE(backtrace_suppression_test_warn_multi), + KUNIT_CASE(backtrace_suppression_test_warn_on_direct), + KUNIT_CASE(backtrace_suppression_test_warn_on_indirect), + {} +}; + +static struct kunit_suite backtrace_suppression_test_suite =3D { + .name =3D "backtrace-suppression-test", + .test_cases =3D backtrace_suppression_test_cases, +}; +kunit_test_suites(&backtrace_suppression_test_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("KUnit test to verify warning backtrace suppression"); --=20 2.52.0