linux-kernel - Re: [PATCH v3] lib: kunit: Provides a userspace memory context when tests are compiled as module

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Date:   Tue, 21 Jul 2020 16:52:51 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Vitor Massaru Iha <vitor@...saru.org>
Cc:     KUnit Development <kunit-dev@...glegroups.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        David Gow <davidgow@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v3] lib: kunit: Provides a userspace memory context when
 tests are compiled as module

On Tue, Jul 21, 2020 at 10:40 AM Vitor Massaru Iha <vitor@...saru.org> wrote:
>
> KUnit test cases run on kthreads, and kthreads don't have an
> adddress space (current->mm is NULL), but processes have mm.
>
> The purpose of this patch is to allow to borrow mm to KUnit kthread
> after userspace is brought up, because we know that there are processes
> running, at least the process that loaded the module to borrow mm.
>
> This allows, for example, tests such as user_copy_kunit, which uses
> vm_mmap, which needs current->mm.
>
> Signed-off-by: Vitor Massaru Iha <vitor@...saru.org>

Isn't this a dependency for the test_user_copy? Also, don't we also
need the change that makes kunit_tool build modules? It seems like you
should put these together in a patchset like you did before. If not,
you should at least reference the dependencies in each patch.