tracing: Make trace_marker use the correct per-instance buffer

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.

Link: http://lkml.kernel.org/r/1372717885-4543-2-git-send-email-azl@google.com

Cc: David Sharp <dhsharp@google.com>
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Alexander Z Lam <lambchop468@gmail.com>
Cc: stable@vger.kernel.org # 3.10
Signed-off-by: Alexander Z Lam <azl@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0dc50711d656..e04e7119633d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4391,6 +4391,7 @@ 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;
@@ -4450,7 +4451,7 @@ 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) {