Re: [PATCH v4] mm: fix accounting of memmap pages

[Andrew Morton]

On Fri, 8 Aug 2025 16:23:52 +0200 David Hildenbrand <david@xxxxxxxxxx> wrote:

> > @@ -567,6 +564,8 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
> >   				sparse_buffer_fini();
> >   				goto failed;
> >   			}
> > +			memmap_boot_pages_add(DIV_ROUND_UP(PAGES_PER_SECTION * sizeof(struct page),
> > +							   PAGE_SIZE));
> 
> IIRC, we can have partially populated boot sections, where only some 
> subsections actually have a memmap ... so this calculation is possibly 
> wrong in some cases.

The patch (which has cc:stable!) has been in state "stuck" for 12 days
due to "possibly wrong".  Could someone please find a way to get it
unstuck?