fixup_int 91 arch/x86/kernel/head64.c *fixup_int(&__pgtable_l5_enabled, physaddr) = 1; fixup_int 92 arch/x86/kernel/head64.c *fixup_int(&pgdir_shift, physaddr) = 48; fixup_int 93 arch/x86/kernel/head64.c *fixup_int(&ptrs_per_p4d, physaddr) = 512;