1114 static int select_size(bool first_skb, bool zc)  in select_size()  argument
1116 	if (zc)  in select_size()
1183 	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()
1285 			linear = select_size(first_skb, zc);  in tcp_sendmsg_locked()
1310 		if (skb_availroom(skb) > 0 && !zc) {  in tcp_sendmsg_locked()
1316 		} else if (!zc) {  in tcp_sendmsg_locked()
1748 				struct tcp_zerocopy_receive *zc)  in tcp_zerocopy_receive()  argument
1750 	unsigned long address = (unsigned long)zc->address;  in tcp_zerocopy_receive()
1758 	if (address & (PAGE_SIZE - 1) || address != zc->address)  in tcp_zerocopy_receive()
1772 	zc->length = min_t(unsigned long, zc->length, vma->vm_end - address);  in tcp_zerocopy_receive()
1776 	zc->length = min_t(u32, zc->length, tcp_inq(sk));  in tcp_zerocopy_receive()
1777 	zc->length &= ~(PAGE_SIZE - 1);  in tcp_zerocopy_receive()
1779 	zap_page_range(vma, address, zc->length);  in tcp_zerocopy_receive()
1781 	zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1783 	while (length + PAGE_SIZE <= zc->length) {  in tcp_zerocopy_receive()
1784 		if (zc->recv_skip_hint < PAGE_SIZE) {  in tcp_zerocopy_receive()
1792 			zc->recv_skip_hint = skb->len - offset;  in tcp_zerocopy_receive()
1812 		zc->recv_skip_hint -= PAGE_SIZE;  in tcp_zerocopy_receive()
1825 		if (length == zc->length)  in tcp_zerocopy_receive()
1826 			zc->recv_skip_hint = 0;  in tcp_zerocopy_receive()
1828 		if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE))  in tcp_zerocopy_receive()
1831 	zc->length = length;  in tcp_zerocopy_receive()
3549 		struct tcp_zerocopy_receive zc;  in do_tcp_getsockopt()  local
3554 		if (len != sizeof(zc))  in do_tcp_getsockopt()
3556 		if (copy_from_user(&zc, optval, len))  in do_tcp_getsockopt()
3559 		err = tcp_zerocopy_receive(sk, &zc);  in do_tcp_getsockopt()
3561 		if (!err && copy_to_user(optval, &zc, len))  in do_tcp_getsockopt()