Only poison, don't sanity check

configname: CONFIG_PAGE_POISONING_NO_SANITY

Linux Kernel Configuration
└─>Memory Debugging
└─>Only poison, don't sanity check
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Skip the sanity checking on alloc, only fill the pages with
poison on free. This reduces some of the overhead of the
poisoning feature.

If you are only interested in sanitization, say Y. Otherwise
say N.