linux-kernel - Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

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Message-ID: <CAFd5g44xciLPBhH_J3zUcY3TedWTijdnWgF055qffF+dAguhPQ@mail.gmail.com>
Date:   Mon, 12 Aug 2019 17:41:05 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
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        Masahiro Yamada <yamada.masahiro@...ionext.com>,
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Subject: Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream
 like string builder

On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 16:33:36)
> > On Mon, Aug 12, 2019 at 03:55:19PM -0700, Stephen Boyd wrote:
> > > Quoting Brendan Higgins (2019-08-12 11:24:06)
> > > > +void string_stream_clear(struct string_stream *stream)
> > > > +{
> > > > +       struct string_stream_fragment *frag_container, *frag_container_safe;
> > > > +
> > > > +       spin_lock(&stream->lock);
> > > > +       list_for_each_entry_safe(frag_container,
> > > > +                                frag_container_safe,
> > > > +                                &stream->fragments,
> > > > +                                node) {
> > > > +               list_del(&frag_container->node);
> > >
> > > Shouldn't we free the allocation here? Otherwise, if some test is going
> > > to add, add, clear, add, it's going to leak until the test is over?
> >
> > So basically this means I should add a kunit_kfree and
> > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > devres_destroy) and use kunit_kfree here?
> >
>
> Yes, or drop the API entirely? Does anything need this functionality?

Drop the kunit_resource API? I would strongly prefer not to.
string_stream uses it; the expectation stuff uses it via string
stream; some of the tests in this patchset allocate memory as part of
the test setup that uses it. The intention is that we would provide a
kunit_res_* version of many (hopefully eventually most) common
resources required by tests and it would be used in the same way that
the devm_* stuff is.

Nevertheless, I am fine adding the kunit_resource_destroy, etc. I just
wanted to make sure I understood what you were asking.