default or selected kernelversion does not have config value CONFIG_INFINIBAND_EXP_USER_ACCESS.
Result is shown for kernelversion 6.7-rc3

Allow experimental support for Infiniband ABI

configname: CONFIG_INFINIBAND_EXP_USER_ACCESS

Linux Kernel Configuration
└─>Device Drivers
└─>InfiniBand support
└─>Allow experimental support for Infiniband ABI
In linux kernel since version 4.9.1 (release Date: 2017-01-06)  
IOCTL based ABI support for Infiniband. This allows userspace
to invoke the experimental IOCTL based ABI.
These commands are parsed via per-device parsing tree and
enables per-device features.