Hi Dave, Because unavailable memory can be in the middle of a section, I think a proper fix would be to do pfn_valid() check only at the beginning of section. Otherwise, we might miss zeroing a struct page is in the middle of a section but pfn_valid() could potentially return false as that page is indeed invalid. So, I would do something like this: + if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages)) + continue; Could you please test if this fix works? We should really look into this memory that is reserved by memblock but Linux is not aware of physical backing, so far I know that only x86 can have such scenarios, so we should really see if the problem can be addressed on x86 platform. It would be very nice if we could enforce inside memblock to reserve only memory that has real physical backing. Thank you, Pavel -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
