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

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Message-ID: <aRoZq2bYYm5MGihy@kernel.org>
Date: Sun, 16 Nov 2025 20:36:27 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v5 22/22] tests/liveupdate: Add in-kernel liveupdate test

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@...nel.org> 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@...een.com>
> > > ---
> > >  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()?
 
> Pasha

-- 
Sincerely yours,
Mike.