Re: [PATCH] kho: init alloc tags when restoring pages from reserved memory

[Suren Baghdasaryan]

On Sun, Jan 11, 2026 at 1:09 AM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
>
> On Fri, Jan 09, 2026 at 10:42:51AM +0000, ranxiaokai627@xxxxxxx wrote:
> > From: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
> >
> > Memblock pages (including reserved memory) should have their allocation
> > tags initialized to CODETAG_EMPTY via clear_page_tag_ref() before being
> > released to the page allocator. When kho restores pages through
> > kho_restore_page(), missing this call causes mismatched
> > allocation/deallocation tracking and warning message:
> > alloc_tag was not set.
> >
> > Add missing clear_page_tag_ref() annotation in kho_restore_page() to
> > fix this.
> >
> > Signed-off-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
>
> Reviewed-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>

Reviewed-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>

>
> > ---
> >  kernel/liveupdate/kexec_handover.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c
> > index cd6b3fb9dcae..2d47f2c50bd8 100644
> > --- a/kernel/liveupdate/kexec_handover.c
> > +++ b/kernel/liveupdate/kexec_handover.c
> > @@ -268,6 +268,7 @@ static struct page *kho_restore_page(phys_addr_t phys, bool is_folio)
> >       else
> >               kho_init_pages(page, nr_pages);
> >
> > +     clear_page_tag_ref(page);
> >       adjust_managed_page_count(page, nr_pages);
> >       return page;
> >  }
> > --
> > 2.25.1
> >
> >
>
> --
> Sincerely yours,
> Mike.