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

Brendan Higgins brendanhiggins at google.com
Tue Jul 21 23:52:51 UTC 2020

On Tue, Jul 21, 2020 at 10:40 AM Vitor Massaru Iha <vitor at massaru.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 at massaru.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.

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