CONFIG_ARM64_USER_VA_BITS_52 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
default or selected kernelversion does not have config value CONFIG_ARM64_USER_VA_BITS_52.
Result is shown for kernelversion 6.5.1
52-bit (user)
configname: CONFIG_ARM64_USER_VA_BITS_52
Virtual address space size
└─>52-bit (user)
In linux kernel since version 5 (release Date: 2019-03-03)
Enable 52-bit virtual addressing for userspace when explicitly
requested via a hint to mmap(). The kernel will continue to
use 48-bit virtual addresses for its own mappings.
NOTE: Enabling 52-bit virtual addressing in conjunction with
ARMv8.3 Pointer Authentication will result in the PAC being
reduced from 7 bits to 3 bits, which may have a significant
impact on its susceptibility to brute-force attacks.
If unsure, select 48-bit virtual addressing instead.
requested via a hint to mmap(). The kernel will continue to
use 48-bit virtual addresses for its own mappings.
NOTE: Enabling 52-bit virtual addressing in conjunction with
ARMv8.3 Pointer Authentication will result in the PAC being
reduced from 7 bits to 3 bits, which may have a significant
impact on its susceptibility to brute-force attacks.
If unsure, select 48-bit virtual addressing instead.