On Thu, Mar 9, 2017 at 10:10 AM, Linus Torvalds <torva...@linux-foundation.org> wrote: > > Very odd. We should always have PGE (0x0080) set in cr4 (if the CPU > supports it).
Daniel, do you see the code in probe_page_size_mask() triggering? /* Enable PGE if available */ if (boot_cpu_has(X86_FEATURE_PGE)) { cr4_set_bits_and_update_boot(X86_CR4_PGE); __supported_pte_mask |= _PAGE_GLOBAL; } else __supported_pte_mask &= ~_PAGE_GLOBAL; but maybe there's something wrong with the percpu cr4 caching? Linus