CONFIG_LOWMEM_CAM_NUM is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Number of CAMs to use to map low memory

configname: CONFIG_LOWMEM_CAM_NUM

Linux Kernel Configuration
└─>Advanced setup
└─>Number of CAMs to use to map low memory
In linux kernel since version 2.6.30 (release Date: 2009-06-09)