From: Marco Elver <elver@google.com>
To: David Gow <davidgow@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>,
Daniel Latypov <dlatypov@google.com>,
Shuah Khan <skhan@linuxfoundation.org>,
Dmitry Vyukov <dvyukov@google.com>,
kunit-dev@googlegroups.com, kasan-dev@googlegroups.com,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] kcsan: test: Add a .kunitconfig to run KCSAN tests
Date: Wed, 18 May 2022 11:21:50 +0200 [thread overview]
Message-ID: <YoS6rthXi9VRXpkg@elver.google.com> (raw)
In-Reply-To: <20220518073232.526443-2-davidgow@google.com>
On Wed, May 18, 2022 at 03:32PM +0800, David Gow wrote:
> 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 x86_64-smp qemu-based setup should be used:
> ./tools/testing/kunit/kunit.py run --arch=x86_64-smp --kunitconfig=kernel/kcsan
>
> Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Thanks for adding this.
> ---
> kernel/kcsan/.kunitconfig | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
> create mode 100644 kernel/kcsan/.kunitconfig
>
> diff --git a/kernel/kcsan/.kunitconfig b/kernel/kcsan/.kunitconfig
> new file mode 100644
> index 000000000000..a8a815b1eb73
> --- /dev/null
> +++ b/kernel/kcsan/.kunitconfig
> @@ -0,0 +1,20 @@
> +# Note that the KCSAN tests need to run on an SMP setup.
> +# Under kunit_tool, this can be done by using the x86_64-smp
> +# qemu-based architecture:
> +# ./tools/testing/kunit/kunit.py run --kunitconfig=kernel/kcsan --arch=x86_64-smp
> +
> +CONFIG_KUNIT=y
> +
> +CONFIG_DEBUG_KERNEL=y
> +
> +CONFIG_KCSAN=y
> +CONFIG_KCSAN_KUNIT_TEST=y
> +
> +# Needed for test_barrier_nothreads
> +CONFIG_KCSAN_STRICT=y
> +CONFIG_KCSAN_WEAK_MEMORY=y
Note, KCSAN_STRICT implies KCSAN_WEAK_MEMORY.
Also, a bunch of the test cases' outcomes depend on KCSAN's
"strictness". I think to cover the various combinations would be too
complex, but we can just settle on testing KCSAN_STRICT=y.
The end result is the same, but you could drop the
CONFIG_KCSAN_WEAK_MEMORY=y line, and let the latest KCSAN_STRICT
defaults decide (I don't expect them to change any time soon).
If you want it to be more explicit, it's also fine leaving the
CONFIG_KCSAN_WEAK_MEMORY=y line in.
> +# 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
> --
> 2.36.0.550.gb090851708-goog
>
next prev parent reply other threads:[~2022-05-18 9:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 7:32 [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP testing David Gow
2022-05-18 7:32 ` [PATCH 2/2] kcsan: test: Add a .kunitconfig to run KCSAN tests David Gow
2022-05-18 9:21 ` Marco Elver [this message]
2022-05-19 13:08 ` David Gow
2022-05-19 13:24 ` Marco Elver
2022-07-14 20:22 ` Daniel Latypov
2022-07-14 21:40 ` Marco Elver
2022-07-14 23:45 ` Daniel Latypov
2022-07-14 23:47 ` Daniel Latypov
2022-07-15 6:49 ` David Gow
2022-05-18 17:12 ` Daniel Latypov
2022-07-06 19:53 ` Brendan Higgins
2022-05-18 9:22 ` [PATCH 1/2] kunit: tool: Add x86_64-smp architecture for SMP testing Marco Elver
2022-05-18 15:31 ` Daniel Latypov
2022-05-18 15:35 ` Marco Elver
2022-05-18 15:39 ` Daniel Latypov
2022-05-18 17:05 ` Daniel Latypov
2022-05-19 13:15 ` David Gow
2022-05-19 17:11 ` Daniel Latypov
2022-07-06 19:43 ` Brendan Higgins
2022-07-06 19:44 ` Brendan Higgins
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