Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace

1 files changed, 13 insertions, 9 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ae32d3b99b4b..1ce6208fd727 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -770,30 +770,34 @@ static void trace_save_cmdline(struct task_struct *tsk)
         __raw_spin_unlock(&trace_cmdline_lock);
 }
 
-char *trace_find_cmdline(int pid)
+void trace_find_cmdline(int pid, char comm[])
 {
-        char *cmdline = "<...>";
         unsigned map;
 
-        if (!pid)
-                return "<idle>";
+        if (!pid) {
+                strcpy(comm, "<idle>");
+                return;
+        }
 
-        if (pid > PID_MAX_DEFAULT)
-                goto out;
+        if (pid > PID_MAX_DEFAULT) {
+                strcpy(comm, "<...>");
+                return;
+        }
 
+        __raw_spin_lock(&trace_cmdline_lock);
         map = map_pid_to_cmdline[pid];
         if (map >= SAVED_CMDLINES)
                 goto out;
 
-        cmdline = saved_cmdlines[map];
+        strcpy(comm, saved_cmdlines[map]);
 
  out:
-        return cmdline;
+        __raw_spin_unlock(&trace_cmdline_lock);
 }
 
 void tracing_record_cmdline(struct task_struct *tsk)
 {
-        if (atomic_read(&trace_record_cmdline_disabled))
+        if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
                 return;
 
         trace_save_cmdline(tsk);