1198 	bool zc = false;  in tcp_sendmsg_locked()  local
1211 		zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1212 		if (!zc)  in tcp_sendmsg_locked()
1319 		if (skb_availroom(skb) > 0 && !zc) {  in tcp_sendmsg_locked()
1325 		} else if (!zc) {  in tcp_sendmsg_locked()
1752 					struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_vm_insert_batch()  argument
1771 		zc->recv_skip_hint += bytes_not_mapped;  in tcp_zerocopy_vm_insert_batch()
1777 				struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_receive()  argument
1779 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
1792 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
1809 	zc->length = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
1813 	zc->length = min_t(u32, zc->length, inq);  in tcp_zerocopy_receive()
1814 	zap_len = zc->length & ~(PAGE_SIZE - 1);  in tcp_zerocopy_receive()
1817 		zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1819 		zc->recv_skip_hint = zc->length;  in tcp_zerocopy_receive()
1823 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
1824 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
1831 								   &seq, zc);  in tcp_zerocopy_receive()
1837 				if (zc->recv_skip_hint > 0)  in tcp_zerocopy_receive()
1844 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
1857 			int remaining = zc->recv_skip_hint;  in tcp_zerocopy_receive()
1864 			zc->recv_skip_hint -= remaining;  in tcp_zerocopy_receive()
1870 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
1875 							   &seq, zc);  in tcp_zerocopy_receive()
1884 						   zc);  in tcp_zerocopy_receive()
1896 		if (length == zc->length)  in tcp_zerocopy_receive()
1897 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1899 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
1902 	zc->length = length;  in tcp_zerocopy_receive()
3826 		struct tcp_zerocopy_receive zc;  in do_tcp_getsockopt()  local
3833 		if (len > sizeof(zc)) {  in do_tcp_getsockopt()
3834 			len = sizeof(zc);  in do_tcp_getsockopt()
3838 		if (copy_from_user(&zc, optval, len))  in do_tcp_getsockopt()
3841 		err = tcp_zerocopy_receive(sk, &zc);  in do_tcp_getsockopt()
3843 		if (len == sizeof(zc))  in do_tcp_getsockopt()
3856 			zc.err = sock_error(sk);  in do_tcp_getsockopt()
3858 		zc.inq = tcp_inq_hint(sk);  in do_tcp_getsockopt()
3860 		if (!err && copy_to_user(optval, &zc, len))  in do_tcp_getsockopt()