Contiguous Memory Allocator (CMA)

Hello Is CMA still supported as described in this document https://lwn.net/Articles/396707/ ? Or has it changed and there is a newer version which details how to allocate a chunk of contiguous memory on bootup and then use it with a loadable kernel module? What I want to do is allocate a chunk of contiguous memory at boot time and use it with a loadable driver. It will be a vanilla Centos kernel and I wonder if they are compiled with the CMA enabled. When I check dmesg I see " 0K cma-reserved" so it still exists. Thanks S