linux-kernel - Re: [PATCH v5 02/22] liveupdate: luo

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Message-ID: <CA+CK2bD3hps+atqUZ2LKyuoOSRRUWpTPE+frd5g13js4EAFK8g@mail.gmail.com>
Date: Tue, 11 Nov 2025 15:42:24 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Mike Rapoport <rppt@...nel.org>
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Subject: Re: [PATCH v5 02/22] liveupdate: luo_core: integrate with KHO

On Tue, Nov 11, 2025 at 3:39 PM Pasha Tatashin
<pasha.tatashin@...een.com> wrote:
>
> > >       kho_memory_init();
> > >
> > > +     /* Live Update should follow right after KHO is initialized */
> > > +     liveupdate_init();
> > > +
> >
> > Why do you think it should be immediately after kho_memory_init()?
> > Any reason this can't be called from start_kernel() or even later as an
> > early_initcall() or core_initall()?
>
> Unfortunately, no, even here it is too late, and we might need to find
> a way to move the kho_init/liveupdate_init earlier. We must be able to
> preserve HugeTLB pages, and those are reserved earlier in boot.

Just to clarify: liveupdate_init() is needed to start using:
liveupdate_flb_incoming_* API, and FLB data is needed during HugeTLB
reservation.

Pasha