check_zeroed_user
return check_zeroed_user(src.user + offset, size);
extern __must_check int check_zeroed_user(const void __user *from, size_t size);
int ret = check_zeroed_user(src + size, rest);
res = check_zeroed_user(uaddr.user + expected_size,
ret = check_zeroed_user(buf, sizeof(unotif));
int retval = check_zeroed_user(umem + start, len);
EXPORT_SYMBOL(check_zeroed_user);