On 5/11/20 10:04 AM, Kirill A. Shutemov wrote: > + if (not_addressable) { > + pr_err("%lldMB of physical memory is not addressable in the paging mode\n", > + not_addressable >> 20); > + if (!pgtable_l5_enabled()) > + pr_err("Consider enabling 5-level paging\n"); > + } Looks sane to me. Definitely good enough until we get the first bug reports from an end user about how they screwed this up in practice. For the aggregate patch: Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxx> BTW, it's a shame that 0day and friends can't find stuff like this. I have the feeling we have more bugs like this coming.