Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 15 Jul 2022 14:40:52 +0800
Message-Id: <20220715064052.2673958-1-davidgow@google.com>
Mime-Version: 1.0
Subject: [PATCH v2] kcsan: test: Add a .kunitconfig to run KCSAN tests
From:   David Gow <davidgow@google.com>
To:     Brendan Higgins <brendanhiggins@google.com>,
        Daniel Latypov <dlatypov@google.com>,
        Marco Elver <elver@google.com>,
        Shuah Khan <skhan@linuxfoundation.org>
Cc:     David Gow <davidgow@google.com>,
        Dmitry Vyukov <dvyukov@google.com>, kunit-dev@googlegroups.com,
        linux-kselftest@vger.kernel.org, kasan-dev@googlegroups.com,
        linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Add a .kunitconfig file, which provides a default, working config for
running the KCSAN tests. Note that it needs to run on an SMP machine, so
to run under kunit_tool, the --qemu_args option should be used (on a
supported architecture, like x86_64). For example:
./tools/testing/kunit/kunit.py run --arch=x86_64 --qemu_args='-smp 8'
					--kunitconfig=kernel/kcsan

Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Brendan Higgins <brendanhiggins@google.com>
---
 kernel/kcsan/.kunitconfig | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 kernel/kcsan/.kunitconfig

diff --git a/kernel/kcsan/.kunitconfig b/kernel/kcsan/.kunitconfig
new file mode 100644
index 000000000000..e82f0f52ab0a
--- /dev/null
+++ b/kernel/kcsan/.kunitconfig
@@ -0,0 +1,24 @@
+# Note that the KCSAN tests need to run on an SMP setup.
+# Under kunit_tool, this can be done by using the --qemu_args
+# option to configure a machine with several cores. For example:
+# ./tools/testing/kunit/kunit.py run --kunitconfig=kernel/kcsan \
+# 				 --arch=x86_64 --qemu_args="-smp 8"
+
+CONFIG_KUNIT=y
+
+CONFIG_DEBUG_KERNEL=y
+
+# Need some level of concurrency to test a concurrency sanitizer.
+CONFIG_SMP=y
+
+CONFIG_KCSAN=y
+CONFIG_KCSAN_KUNIT_TEST=y
+
+# Set these if you want to run test_barrier_nothreads
+#CONFIG_KCSAN_STRICT=y
+#CONFIG_KCSAN_WEAK_MEMORY=y
+
+# This prevents the test from timing out on many setups. Feel free to remove
+# (or alter) this, in conjunction with setting a different test timeout with,
+# for example, the --timeout kunit_tool option.
+CONFIG_KCSAN_REPORT_ONCE_IN_MS=100
-- 
2.37.0.170.g444d1eabd0-goog