Please quit top-posting. It's not proper at all.
Please do tell how, or post a link to the procedure. I'm assuming you are taking the default Centos kernel, and not a vanilla/unsupported kernel.
If you're rebuilding the kernel, it's NOT SUPPORTED.
as to rebuilding the centos kernel, rpmbuild --rebuild kernel-xxx.src.rpm --target=arch
works fine.
-- Any sufficiently advanced technology is indistinguishable from magic. -Arthur C. Clarke