From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 20 May 2016 01:32:06 +0000 (-0400)
Subject: Fix: ring buffer: honor switch parameter type in remote switch
X-Git-Tag: v2.6.6~1
X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=commitdiff_plain;h=9a9c9b6e05e8477c3edcf41a7f2697d1e588ce4d

Fix: ring buffer: honor switch parameter type in remote switch

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lib/ringbuffer/ring_buffer_frontend.c b/lib/ringbuffer/ring_buffer_frontend.c
index 6eec3232..b25ce7df 100644
--- a/lib/ringbuffer/ring_buffer_frontend.c
+++ b/lib/ringbuffer/ring_buffer_frontend.c
@@ -1602,11 +1602,17 @@ void lib_ring_buffer_switch_slow(struct lib_ring_buffer *buf, enum switch_mode m
 }
 EXPORT_SYMBOL_GPL(lib_ring_buffer_switch_slow);
 
+struct switch_param {
+	struct lib_ring_buffer *buf;
+	enum switch_mode mode;
+};
+
 static void remote_switch(void *info)
 {
-	struct lib_ring_buffer *buf = info;
+	struct switch_param *param = info;
+	struct lib_ring_buffer *buf = param->buf;
 
-	lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE);
+	lib_ring_buffer_switch_slow(buf, param->mode);
 }
 
 static void _lib_ring_buffer_switch_remote(struct lib_ring_buffer *buf,
@@ -1615,6 +1621,7 @@ static void _lib_ring_buffer_switch_remote(struct lib_ring_buffer *buf,
 	struct channel *chan = buf->backend.chan;
 	const struct lib_ring_buffer_config *config = &chan->backend.config;
 	int ret;
+	struct switch_param param;
 
 	/*
 	 * With global synchronization we don't need to use the IPI scheme.
@@ -1635,8 +1642,10 @@ static void _lib_ring_buffer_switch_remote(struct lib_ring_buffer *buf,
 	 * switch.
 	 */
 	get_online_cpus();
+	param.buf = buf;
+	param.mode = mode;
 	ret = smp_call_function_single(buf->backend.cpu,
-				 remote_switch, buf, 1);
+				 remote_switch, &param, 1);
 	if (ret) {
 		/* Remote CPU is offline, do it ourself. */
 		lib_ring_buffer_switch_slow(buf, mode);