Function symbol gets '.part' suffix after compilation

When cross compiling the Linux kernel 3.18.10, the compiler adds a .part. suffix at the end of some symbols (see an example below). The number `` changes when using different defconfigs. Does anybody know under which conditions the compiler adds the part suffix at the end of a symbol? `$ arm-none-linux-gnueabi-readelf -a vmlinux | grep do_kernel_fault` gives `c03a48f8 116 FUNC LOCAL DEFAULT 2 __do_kernel_fault.part.10`