linux-kernel - Re: [PATCH v5 linux-kselftest-test 3/6] kunit: allow kunit tests to be loaded as a module

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Date:   Tue, 3 Dec 2019 16:51:57 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     Alan Maguire <alan.maguire@...cle.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        David Gow <davidgow@...gle.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        catalin.marinas@....com, joe.lawrence@...hat.com,
        penguin-kernel@...ove.sakura.ne.jp, urezki@...il.com,
        andriy.shevchenko@...ux.intel.com,
        Jonathan Corbet <corbet@....net>, adilger.kernel@...ger.ca,
        Luis Chamberlain <mcgrof@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Knut Omang <knut.omang@...cle.com>
Subject: Re: [PATCH v5 linux-kselftest-test 3/6] kunit: allow kunit tests to
 be loaded as a module

On Tue, Dec 3, 2019 at 4:42 PM Brendan Higgins
<brendanhiggins@...gle.com> wrote:
>
> On Tue, Dec 3, 2019 at 4:39 PM Theodore Y. Ts'o <tytso@....edu> wrote:
> >
> > On Tue, Dec 03, 2019 at 09:54:25AM -0800, Brendan Higgins wrote:
> > > On Tue, Dec 3, 2019 at 4:08 AM Alan Maguire <alan.maguire@...cle.com> wrote:
> > > >
> > > > As tests are added to kunit, it will become less feasible to execute
> > > > all built tests together.  By supporting modular tests we provide
> > > > a simple way to do selective execution on a running system; specifying
> > > >
> > > > CONFIG_KUNIT=y
> > > > CONFIG_KUNIT_EXAMPLE_TEST=m
> > > >
> > > > ...means we can simply "insmod example-test.ko" to run the tests.
> > > >
> > > > To achieve this we need to do the following:
> > > >
> > > > o export the required symbols in kunit
> > > > o string-stream tests utilize non-exported symbols so for now we skip
> > > >   building them when CONFIG_KUNIT_TEST=m.
> > > > o support a new way of declaring test suites.  Because a module cannot
> > > >   do multiple late_initcall()s, we provide a kunit_test_suites() macro
> > > >   to declare multiple suites within the same module at once.
> > > > o some test module names would have been too general ("test-test"
> > > >   and "example-test" for kunit tests, "inode-test" for ext4 tests);
> > > >   rename these as appropriate ("kunit-test", "kunit-example-test"
> > > >   and "ext4-inode-test" respectively).
> > > >
> > > > Co-developed-by: Knut Omang <knut.omang@...cle.com>
> > > > Signed-off-by: Knut Omang <knut.omang@...cle.com>
> > > > Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> > >
> > > Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> >
> > Acked-by: Theodore Ts'o <tytso@....edu> # for ext4 bits
> >
> >
> > I do have one question, out of curiosity --- for people who aren't
> > using UML to run Kunit tests, and are either running the kunit tests
> > during boot, or when the module is loaded, is there the test framework
> > to automatically extract the test reports out of dmesg?
> >
> > I can boot a kernel with kunit tests enabled using kvm, and I see it
> > splatted intermixed with the rest of the kernel boot messages.  This
> > is how I tested the 32-bit ext4 inode test fix.  But I had to manually
> > find the test output.  Is that the expected way people are supposed to
> > be using Kunit tests w/o using UML and the python runner?
>
> For now, yes. We do not currently have a piece that extracts the test
> reports; however, we are planning on pulling that bit out of
> tools/testing/kunit/; we just haven't gotten around to it yet.

I just added a bug for this here:
https://bugzilla.kernel.org/show_bug.cgi?id=205761