Disabling CPU cache in a kernel module

I was reading a paper on the rowhammer exploit and came upon the following,
"...we perform the Rowhammer attack from a kernel module (i.e., with full privileges), which allows us to cultivate optimal conditions for finding bit flips: we disable CPU caching and perform double-sided Rowhammer by using the pagemap interface"
How can one bypass the CPU cache from inside a kernel module?