84 } tcp_probe;  variable
88 	return (tcp_probe.head - tcp_probe.tail) & (bufsize - 1);  in tcp_probe_used()
118 	    (full || tp->snd_cwnd != tcp_probe.lastcwnd)) {  in jtcp_rcv_established()
120 		spin_lock(&tcp_probe.lock);  in jtcp_rcv_established()
123 			struct tcp_log *p = tcp_probe.log + tcp_probe.head;  in jtcp_rcv_established()
157 			tcp_probe.head = (tcp_probe.head + 1) & (bufsize - 1);  in jtcp_rcv_established()
159 		tcp_probe.lastcwnd = tp->snd_cwnd;  in jtcp_rcv_established()
160 		spin_unlock(&tcp_probe.lock);  in jtcp_rcv_established()
162 		wake_up(&tcp_probe.wait);  in jtcp_rcv_established()
178 	spin_lock_bh(&tcp_probe.lock);  in tcpprobe_open()
179 	tcp_probe.head = tcp_probe.tail = 0;  in tcpprobe_open()
180 	tcp_probe.start = ktime_get();  in tcpprobe_open()
181 	spin_unlock_bh(&tcp_probe.lock);  in tcpprobe_open()
189 		= tcp_probe.log + tcp_probe.tail;  in tcpprobe_sprint()
191 		= ktime_to_timespec(ktime_sub(p->tstamp, tcp_probe.start));  in tcpprobe_sprint()
215 		error = wait_event_interruptible(tcp_probe.wait,  in tcpprobe_read()
220 		spin_lock_bh(&tcp_probe.lock);  in tcpprobe_read()
221 		if (tcp_probe.head == tcp_probe.tail) {  in tcpprobe_read()
223 			spin_unlock_bh(&tcp_probe.lock);  in tcpprobe_read()
230 			tcp_probe.tail = (tcp_probe.tail + 1) & (bufsize - 1);  in tcpprobe_read()
232 		spin_unlock_bh(&tcp_probe.lock);  in tcpprobe_read()
265 	init_waitqueue_head(&tcp_probe.wait);  in tcpprobe_init()
266 	spin_lock_init(&tcp_probe.lock);  in tcpprobe_init()
272 	tcp_probe.log = kcalloc(bufsize, sizeof(struct tcp_log), GFP_KERNEL);  in tcpprobe_init()
273 	if (!tcp_probe.log)  in tcpprobe_init()
289 	kfree(tcp_probe.log);  in tcpprobe_init()
298 	kfree(tcp_probe.log);  in tcpprobe_exit()