linux-kernel - Re: [RFC v1 4/6] init: main: add KUnit to kernel init

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Date:   Thu, 23 Jan 2020 14:45:43 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>, David Gow <davidgow@...gle.com>,
        Jeff Dike <jdike@...toit.com>,
        Kees Cook <keescook@...omium.org>,
        Richard Weinberger <richard@....at>, rppt@...ux.ibm.com,
        Shuah Khan <skhan@...uxfoundation.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Knut Omang <knut.omang@...cle.com>,
        linux-um <linux-um@...ts.infradead.org>,
        linux-arch@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v1 4/6] init: main: add KUnit to kernel init

Sorry for the late reply. I sent this thinking I would check in over
vacation, and then didn't.

On Mon, Dec 16, 2019 at 11:58 PM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting Brendan Higgins (2019-12-16 14:05:53)
> > Remove KUnit from init calls entirely, instead call directly from
> > kernel_init().
>
> Yes, but why? Is it desired to run the unit tests earlier than opening
> the console or something?

I want to make sure it is called after late_init is done (so that you
can test things initialized in late_init). And I want to make sure it
runs before init*fs is loaded so that there is a mechanism to run
tests without having to put a userland together.

> > diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> > index 978086cfd257d..ca880224c0bab 100644
> > --- a/lib/kunit/executor.c
> > +++ b/lib/kunit/executor.c
> > @@ -32,12 +32,10 @@ static bool kunit_run_all_tests(void)
> >         return !has_test_failed;
> >  }
> >
> > -static int kunit_executor_init(void)
> > +int kunit_executor_init(void)
>
> Should be marked __init? Even before this patch presumably.

Just this function? No strong opinion.

If by "before this patch" you mean other stuff in this patchset?

> >  {
> >         if (kunit_run_all_tests())
> >                 return 0;
> >         else
> >                 return -EFAULT;
> >  }
> > -
> > -late_initcall(kunit_executor_init);