linux-kernel - Re: [RFC PATCH v2 3/3] kunit: kmalloc_array: Use kunit_add

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Date:   Wed, 5 Apr 2023 15:48:59 +0800
From:   David Gow <davidgow@...gle.com>
To:     Benjamin Berg <benjamin@...solutions.net>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Maxime Ripard <maxime@...no.tech>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        Rae Moar <rmoar@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com
Subject: Re: [RFC PATCH v2 3/3] kunit: kmalloc_array: Use kunit_add_action()

On Wed, 5 Apr 2023 at 01:59, Benjamin Berg <benjamin@...solutions.net> wrote:
>
> Hi,
>
> On Fri, 2023-03-31 at 16:04 +0800, 'David Gow' via KUnit Development wrote:
> > The kunit_add_action() function is much simpler and cleaner to use that
> > the full KUnit resource API for simple things like the
> > kunit_kmalloc_array() functionality.
> >
> > Replacing it allows us to get rid of a number of helper functions, and
> > leaves us with no uses of kunit_alloc_resource(), which has some
> > usability problems and is going to have its behaviour modified in an
> > upcoming patch.
> >
> > Note that we need to use kunit_defer_trigger_all() to implement
> > kunit_kfree().
>
> Just a nitpick: kunit_defer_trigger_all does not exist in the new patch
> anymore. I guess this should be kunit_release_action.
>
> Benjamin
>

Nice catch, thanks! I'll fix it in the next revision.

Cheers,
-- David



-- David

> >
> > Signed-off-by: David Gow <davidgow@...gle.com>
> > ---
> >  lib/kunit/test.c | 48 ++++++++----------------------------------------
> >  1 file changed, 8 insertions(+), 40 deletions(-)
> >
> > diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> > index e2910b261112..ec45c8863f04 100644
> > --- a/lib/kunit/test.c
> > +++ b/lib/kunit/test.c
> > @@ -712,58 +712,26 @@ static struct notifier_block kunit_mod_nb = {
> >  };
> >  #endif
> >
> > -struct kunit_kmalloc_array_params {
> > -       size_t n;
> > -       size_t size;
> > -       gfp_t gfp;
> > -};
> > -
> > -static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context)
> > +void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
> >  {
> > -       struct kunit_kmalloc_array_params *params = context;
> > -
> > -       res->data = kmalloc_array(params->n, params->size, params->gfp);
> > -       if (!res->data)
> > -               return -ENOMEM;
> > -
> > -       return 0;
> > -}
> > +       void *data;
> >
> > -static void kunit_kmalloc_array_free(struct kunit_resource *res)
> > -{
> > -       kfree(res->data);
> > -}
> > +       data = kmalloc_array(n, size, gfp);
> >
> > -void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp)
> > -{
> > -       struct kunit_kmalloc_array_params params = {
> > -               .size = size,
> > -               .n = n,
> > -               .gfp = gfp
> > -       };
> > +       if (!data)
> > +               return NULL;
> >
> > -       return kunit_alloc_resource(test,
> > -                                   kunit_kmalloc_array_init,
> > -                                   kunit_kmalloc_array_free,
> > -                                   gfp,
> > -                                   &params);
> > +       kunit_add_action(test, (kunit_defer_function_t)kfree, data, gfp);
> > +       return data;
> >  }
> >  EXPORT_SYMBOL_GPL(kunit_kmalloc_array);
> >
> > -static inline bool kunit_kfree_match(struct kunit *test,
> > -                                    struct kunit_resource *res, void *match_data)
> > -{
> > -       /* Only match resources allocated with kunit_kmalloc() and friends. */
> > -       return res->free == kunit_kmalloc_array_free && res->data == match_data;
> > -}
> > -
> >  void kunit_kfree(struct kunit *test, const void *ptr)
> >  {
> >         if (!ptr)
> >                 return;
> >
> > -       if (kunit_destroy_resource(test, kunit_kfree_match, (void *)ptr))
> > -               KUNIT_FAIL(test, "kunit_kfree: %px already freed or not allocated by kunit", ptr);
> > +       kunit_release_action(test, (kunit_defer_function_t)kfree, (void *)ptr);
> >  }
> >  EXPORT_SYMBOL_GPL(kunit_kfree);
> >
> > --
> > 2.40.0.348.gf938b09366-goog
> >
>

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