trace: Fix no PID issue for trace marker

Save the Event Meta info include PID into STM log.

Change-Id: I18b00a9f745861e870c055c46b99530d98bdcc73
Signed-off-by: Mulu He <muluhe@codeaurora.org>

kernel/trace/trace.c

@@ -6085,6 +6085,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 {
 	struct trace_array *tr = filp->private_data;
 	struct ring_buffer_event *event;
+	struct trace_entry *trace_entry;
 	struct ring_buffer *buffer;
 	struct print_entry *entry;
 	unsigned long irq_flags;
@@ -6122,7 +6123,8 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 		return -EBADF;
 
 	entry = ring_buffer_event_data(event);
-	entry->ip = _THIS_IP_;
+	trace_entry = (struct trace_entry *)entry;
+	entry->ip = trace_entry->pid;
 
 	len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt);
 	if (len) {
@@ -6136,12 +6138,12 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	if (entry->buf[cnt - 1] != '\n') {
 		entry->buf[cnt] = '\n';
 		entry->buf[cnt + 1] = '\0';
-		stm_log(OST_ENTITY_TRACE_MARKER, entry->buf, cnt + 2);
+		stm_log(OST_ENTITY_TRACE_MARKER, entry, sizeof(*entry)+cnt + 2);
 	} else {
 		entry->buf[cnt] = '\0';
-		stm_log(OST_ENTITY_TRACE_MARKER, entry->buf, cnt + 1);
+		stm_log(OST_ENTITY_TRACE_MARKER, entry, sizeof(*entry)+cnt + 1);
 	}
-
+	entry->ip = _THIS_IP_;
 	__buffer_unlock_commit(buffer, event);
 
 	if (written > 0)