[$] kcmp() breaks loose

Given the large set of system calls implemented by the Linux kernel, itwould not be surprising for most people to be unfamiliar with a few ofthem. Not everybody needs to know the details ofsetresgid(),modify_ldt(),orlookup_dcookie(),after all. But even developers who have a wide understanding of the Linuxsystem-call set may be surprised by kcmp(),which is not enabled by default in the kernel build. It would seem,though, that the word has gotten out, leading to an effort to makekcmp() more widely available.