CONFIG_64BIT is not available for the selected architecture x86.
Result is shown for architecture s390

CONFIG_64BIT (not configurable)

modulename: scall64-n64.ko

and/or

ioremap64.ko

and/or

sys_parisc32.ko

and/or

perf.ko

configname: CONFIG_64BIT

Linux Kernel Configuration
└─>Processor type and features
└─>64BIT
In linux kernel since version 2.6.12 )
source code:
arch/mips/kernel/