[PATCH 2/3] tracing: Make trace_marker use the correct per-instance buffer

[Alexander Z Lam <azl@google.com>]

The trace_marker file was present for each new instance created, but it
added the trace mark to the global trace buffer instead of to
the instance's buffer.

Cc: David Sharp <dhsharp@google.com>
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Alexander Z Lam <lambchop468@gmail.com>
Signed-off-by: Alexander Z Lam <azl@google.com>
---
 kernel/trace/trace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e0b0d2a..2f7307e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4351,6 +4351,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 					size_t cnt, loff_t *fpos)
 {
 	unsigned long addr = (unsigned long)ubuf;
+	struct trace_array *tr = filp->private_data;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
 	struct print_entry *entry;
@@ -4410,7 +4411,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 
 	local_save_flags(irq_flags);
 	size = sizeof(*entry) + cnt + 2; /* possible \n added */
-	buffer = global_trace.trace_buffer.buffer;
+	buffer = tr->trace_buffer.buffer;
 	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
 					  irq_flags, preempt_count());
 	if (!event) {
-- 
1.8.3