mcsafe_handle_tail  211 arch/x86/include/asm/uaccess_64.h mcsafe_handle_tail(char *to, char *from, unsigned len);
mcsafe_handle_tail    9 tools/perf/bench/mem-memcpy-x86-64-lib.c unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len);