How to allocate hugepage in kernel module?

Hi, everyone How can I allocate physically contiguous huge page in kernel module ? The routine of _get_fee_pages() fails whenever there are much free memory in system. I found the procedures for set hugepages with sysctl or /proc/sys/vm/nr_hugepages but I've not found the api for allocate the huge page in kernel. Thanks in advnace. Best Regards, J.Hwan Kim