1188 	bool zc = false;  in tcp_sendmsg_locked()  local
1201 		zc = sk->sk_route_caps & NETIF_F_SG;  in tcp_sendmsg_locked()
1202 		if (!zc)  in tcp_sendmsg_locked()
1309 		if (skb_availroom(skb) > 0 && !zc) {  in tcp_sendmsg_locked()
1315 		} else if (!zc) {  in tcp_sendmsg_locked()
1741 				struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_receive()  argument
1743 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
1752 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
1766 	zc->length = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
1771 	zc->length = min_t(u32, zc->length, inq);  in tcp_zerocopy_receive()
1772 	zc->length &= ~(PAGE_SIZE - 1);  in tcp_zerocopy_receive()
1773 	if (zc->length) {  in tcp_zerocopy_receive()
1774 		zap_page_range(vma, address, zc->length);  in tcp_zerocopy_receive()
1775 		zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1777 		zc->recv_skip_hint = inq;  in tcp_zerocopy_receive()
1780 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
1781 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
1789 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
1802 			int remaining = zc->recv_skip_hint;  in tcp_zerocopy_receive()
1809 			zc->recv_skip_hint -= remaining;  in tcp_zerocopy_receive()
1818 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
1831 		if (length == zc->length)  in tcp_zerocopy_receive()
1832 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1834 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
1837 	zc->length = length;  in tcp_zerocopy_receive()
3654 		struct tcp_zerocopy_receive zc;  in do_tcp_getsockopt()  local
3659 		if (len != sizeof(zc))  in do_tcp_getsockopt()
3661 		if (copy_from_user(&zc, optval, len))  in do_tcp_getsockopt()
3664 		err = tcp_zerocopy_receive(sk, &zc);  in do_tcp_getsockopt()
3666 		if (!err && copy_to_user(optval, &zc, len))  in do_tcp_getsockopt()