__open_path_or_exit
page_idle_fd = __open_path_or_exit("/sys/kernel/mm/page_idle/bitmap", O_RDWR,
int __open_path_or_exit(const char *path, int flags, const char *enoent_help);
return __open_path_or_exit(path, flags, "");
return __open_path_or_exit(KVM_DEV_PATH, flags, "Is KVM loaded and enabled?");