linux-kernel - Re: [PATCH v4 1/5] kunit: unify module and builtin suite definitions

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Message-ID: <CAMuHMdW-v7Ovcx8+3XALK_cS8OxODVP5nDVT8n44q_9C=C+C2Q@mail.gmail.com>
Date:   Fri, 12 Aug 2022 10:08:21 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     David Gow <davidgow@...gle.com>
Cc:     Jeremy Kerr <jk@...econstruct.com.au>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Andrew Jeffery <andrew@...id.au>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Longpeng <longpeng2@...wei.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Maíra Canal <maira.canal@....br>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        USB list <linux-usb@...r.kernel.org>,
        linux-modules@...r.kernel.org,
        Matt Johnston <matt@...econstruct.com.au>
Subject: Re: [PATCH v4 1/5] kunit: unify module and builtin suite definitions

Hi David,

On Thu, Aug 11, 2022 at 6:56 PM David Gow <davidgow@...gle.com> wrote:
> On Thu, Aug 11, 2022 at 9:49 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Sat, Jul 9, 2022 at 5:21 AM David Gow <davidgow@...gle.com> wrote:
> > > From: Jeremy Kerr <jk@...econstruct.com.au>
> > >
> > > Currently, KUnit runs built-in tests and tests loaded from modules
> > > differently. For built-in tests, the kunit_test_suite{,s}() macro adds a
> > > list of suites in the .kunit_test_suites linker section. However, for
> > > kernel modules, a module_init() function is used to run the test suites.
> > >
> > > This causes problems if tests are included in a module which already
> > > defines module_init/exit_module functions, as they'll conflict with the
> > > kunit-provided ones.
> > >
> > > This change removes the kunit-defined module inits, and instead parses
> > > the kunit tests from their own section in the module. After module init,
> > > we call __kunit_test_suites_init() on the contents of that section,
> > > which prepares and runs the suite.
> > >
> > > This essentially unifies the module- and non-module kunit init formats.
> > >
> > > Tested-by: Maíra Canal <maira.canal@....br>
> > > Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> > > Signed-off-by: Jeremy Kerr <jk@...econstruct.com.au>
> > > Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> > > Signed-off-by: David Gow <davidgow@...gle.com>
> >
> > Thanks for your patch, which is now commit 3d6e44623841c8b8 ("kunit:
> > unify module and builtin suite definitions") upstream.
> >
> > Since this commit, modular kunit tests are no longer run at all.
> >
> > Before:
> >
> >     # insmod lib/kunit/kunit.ko
> >     # insmod lib/test_hash.ko
> >     test_hash: loading test module taints kernel.
> >         # Subtest: hash
> >         1..2
> >         ok 1 - test_string_or
> >         ok 2 - test_hash_or
> >     # hash: pass:2 fail:0 skip:0 total:2
> >     # Totals: pass:2 fail:0 skip:0 total:2
> >     ok 1 - hash
> >
> > After:
> >
> >     # insmod lib/kunit/kunit.ko
> >     # insmod lib/test_hash.ko
> >     test_hash: loading test module taints kernel.
> >
> > The actual test code (and test init code, if it exists) is not run.
> >
> > Reverting commits e5857d396f35e59e ("kunit: flatten kunit_suite***
> > to kunit_suite** in .kunit_test_suites") and 3d6e44623841c8b8 ("kunit:
> > unify module and builtin suite definitions") fixes the issue.
>
> Thanks Geert,
>
> This is a known issue. There's a patch to fix it here, which just
> missed the pull request:
> https://patchwork.kernel.org/project/linux-kselftest/patch/20220713005221.1926290-1-davidgow@google.com/
>
> We'll try to get it merged as soon as possible.

Thanks for the pointer. I can confirm it fixes the issue, so I provided
my Tb tag.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds