Re: [PATCH v5 22/22] tests/liveupdate: Add in-kernel liveupdate test

[Pasha Tatashin]

On Sun, Nov 16, 2025 at 1:36 PM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
>
> On Wed, Nov 12, 2025 at 03:40:53PM -0500, Pasha Tatashin wrote:
> > On Wed, Nov 12, 2025 at 3:24 PM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
> > >
> > > On Fri, Nov 07, 2025 at 04:03:20PM -0500, Pasha Tatashin wrote:
> > > > Introduce an in-kernel test module to validate the core logic of the
> > > > Live Update Orchestrator's File-Lifecycle-Bound feature. This
> > > > provides a low-level, controlled environment to test FLB registration
> > > > and callback invocation without requiring userspace interaction or
> > > > actual kexec reboots.
> > > >
> > > > The test is enabled by the CONFIG_LIVEUPDATE_TEST Kconfig option.
> > > >
> > > > Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
> > > > ---
> > > >  kernel/liveupdate/luo_file.c     |   2 +
> > > >  kernel/liveupdate/luo_internal.h |   8 ++
> > > >  lib/Kconfig.debug                |  23 ++++++
> > > >  lib/tests/Makefile               |   1 +
> > > >  lib/tests/liveupdate.c           | 130 +++++++++++++++++++++++++++++++
> > > >  5 files changed, 164 insertions(+)
> > > >  create mode 100644 lib/tests/liveupdate.c
> > > >
> > > > diff --git a/kernel/liveupdate/luo_file.c b/kernel/liveupdate/luo_file.c
> > > > index 713069b96278..4c0a75918f3d 100644
> > > > --- a/kernel/liveupdate/luo_file.c
> > > > +++ b/kernel/liveupdate/luo_file.c
> > > > @@ -829,6 +829,8 @@ int liveupdate_register_file_handler(struct liveupdate_file_handler *fh)
> > > >       INIT_LIST_HEAD(&fh->flb_list);
> > > >       list_add_tail(&fh->list, &luo_file_handler_list);
> > > >
> > > > +     liveupdate_test_register(fh);
> > > > +
> > >
> > > Do it mean that every flb user will be added here?
> >
> > No, FLB users will use:
> >
> > liveupdate_register_flb() from various subsystems. This
> > liveupdate_test_register() is only to allow kernel test to register
> > test-FLBs to every single file-handler for in-kernel testing purpose
> > only.
>
> Why the in kernel test cannot liveupdate_register_flb()?

The kernel tests call liveupdate_register_flb() with every
file-handler that registers with LUO. It is unreasonable to expect
that all file handlers from various subsystems are going to be
exported and accessible to kernel test.

>
> > Pasha
>
> --
> Sincerely yours,
> Mike.