linux-kernel - Re: [PATCH v5 00/12] kunit: create a centralized executor to dispatch all KUnit tests

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Date:   Tue, 4 Aug 2020 13:01:30 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        David Gow <davidgow@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, rppt@...ux.ibm.com,
        Frank Rowand <frowand.list@...il.com>, catalin.marinas@....com,
        will@...nel.org, Michal Simek <monstr@...str.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Chris Zankel <chris@...kel.net>, jcmvbkbc@...il.com,
        Greg KH <gregkh@...uxfoundation.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        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>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-xtensa@...ux-xtensa.org
Subject: Re: [PATCH v5 00/12] kunit: create a centralized executor to dispatch
 all KUnit tests

On Fri, Jun 26, 2020 at 2:52 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Fri, Jun 26, 2020 at 02:09:05PM -0700, Brendan Higgins wrote:
> > This patchset adds a centralized executor to dispatch tests rather than
> > relying on late_initcall to schedule each test suite separately along
> > with a couple of new features that depend on it.

Sorry it took so long to reply. I got sucked into some other stuff again.

> So, the new section looks fine to me (modulo the INIT_DATA change). The
> plumbing to start the tests, though, I think is redundant. Why not just
> add a sysctl that starts all known tests?

We already have that; however, we use debugfs to start the tests -
same difference. I just find it convenient to not have to build and
then maintain a userland for each architecture. It's also really nice
that KUnit "just works out of the box" - you don't have to download
anything other than the kernel source, and you don't need to do any
steps outside of just run "kuit.py run". That seems like a big
advantage to me.

> That way you don't need the plumbing into init/main.c, and you can have
> a mode where builtin tests can be started on a fully booted system too.
>
> i.e. boot with "sysctl.kernel.kunit=start" or when fully booted with
> "echo start > /proc/sys/kernel/kunit"
>
> And instead of the kunit-specific halt/reboot stuff, how about moving
> /proc/sysrq-trigger into /proc/sys instead? Then you (or anything) could
> do:
>
> sysctl.kernel.kunit=start sysctl.kernel.sysrq-trigger=b

I think it might be harder to make a case for the reboot stuff without
the stuff I am working on outside of this patchset. I think I will
probably drop that patch from this patchset and reintroduce it later.