linux-kernel - Re: [RFC PATCH v2 1/3] Add KUnit Struct to Current Task

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Message-ID: <CAKFsvULUx3qi_kMGJx69ndzCgq=m2xf4XWrYRYBCViud0P7qqA@mail.gmail.com>
Date:   Tue, 24 Mar 2020 10:42:51 -0700
From:   Patricia Alfonso <trishalfonso@...gle.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     David Gow <davidgow@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        kunit-dev@...glegroups.com,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/3] Add KUnit Struct to Current Task

On Tue, Mar 24, 2020 at 9:40 AM Alan Maguire <alan.maguire@...cle.com> wrote:
>
>
> On Thu, 19 Mar 2020, Patricia Alfonso wrote:
>
> > In order to integrate debugging tools like KASAN into the KUnit
> > framework, add KUnit struct to the current task to keep track of the
> > current KUnit test.
> >
> > Signed-off-by: Patricia Alfonso <trishalfonso@...gle.com>
> > ---
> >  include/linux/sched.h | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/include/linux/sched.h b/include/linux/sched.h
> > index 04278493bf15..1fbfa0634776 100644
> > --- a/include/linux/sched.h
> > +++ b/include/linux/sched.h
> > @@ -1180,6 +1180,10 @@ struct task_struct {
> >       unsigned int                    kasan_depth;
> >  #endif
> >
> > +#if IS_BUILTIN(CONFIG_KUNIT)
>
> This patch set looks great! You might have noticed I
> refreshed the kunit resources stuff to incorporate
> feedback from Brendan, but I don't think any API changes
> were made that should have consequences for your code
> (I'm building with your patches on top to make sure).
> I'd suggest promoting from RFC to v3 on the next round
> unless anyone objects.
>
> As Dmitry suggested, the above could likely be changed to be
> "#ifdef CONFIG_KUNIT" as kunit can be built as a
> module also. More on this in patch 2..
>
I suppose this could be changed so that this can be used in possible
future scenarios, but for now, since built-in things can't rely on
modules, the KASAN integration relies on KUnit being built-in.

> > +     struct kunit                    *kunit_test;
> > +#endif /* IS_BUILTIN(CONFIG_KUNIT) */
> > +
> >  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> >       /* Index of current stored address in ret_stack: */
> >       int                             curr_ret_stack;
> > --
> > 2.25.1.696.g5e7596f4ac-goog
> >
> >

-- 
Best,
Patricia