X86_PF_RSVD
if (error_code & (X86_PF_PROT | X86_PF_USER | X86_PF_RSVD))
if (!(hw_error_code & (X86_PF_RSVD | X86_PF_USER | X86_PF_PROT))) {
if (unlikely(error_code & X86_PF_RSVD))
(error_code & X86_PF_RSVD) ? "reserved bit violation" :