On Mon, May 16, 2022 at 06:22:05PM +0800, Muchun Song wrote: > If the size of "struct page" is not the power of two but with the feature > of minimizing overhead of struct page associated with each HugeTLB is > enabled, then the vmemmap pages of HugeTLB will be corrupted after > remapping (panic is about to happen in theory). But this only exists when > !CONFIG_MEMCG && !CONFIG_SLUB on x86_64. However, it is not a conventional > configuration nowadays. So it is not a real word issue, just the result > of a code review. > > But we cannot prevent anyone from configuring that combined configure. > This hugetlb_optimize_vmemmap should be disable in this case to fix this > issue. > > Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> > Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > Acked-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: Oscar Salvador <osalvador@xxxxxxx> -- Oscar Salvador SUSE Labs
