trace_workqueues: fix empty line's output

Empty lines separate cpus stat. After previous
fix(trace_stat: keep original order) applied, the empty lines
are displayed at incorrect position.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Steven Rostedt <srostedt@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <49C9F266.2060706@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
index 9ab035b58cf1425b4b817dfae37d0b36e5eeada3..797201e4a1376af5987bbce519398b14de3aeada 100644 (file)
--- a/kernel/trace/trace_workqueue.c
+++ b/kernel/trace/trace_workqueue.c
@@ -196,6 +196,11 @@ static int workqueue_stat_show(struct seq_file *s, void *p)
        struct pid *pid;
        struct task_struct *tsk;
 
+       spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+       if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
+               seq_printf(s, "\n");
+       spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
        pid = find_get_pid(cws->pid);
        if (pid) {
                tsk = get_pid_task(pid, PIDTYPE_PID);
@@ -208,18 +213,13 @@ static int workqueue_stat_show(struct seq_file *s, void *p)
                put_pid(pid);
        }
 
-       spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
-       if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
-               seq_printf(s, "\n");
-       spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
-
        return 0;
 }
 
 static int workqueue_stat_headers(struct seq_file *s)
 {
        seq_printf(s, "# CPU  INSERTED  EXECUTED   NAME\n");
-       seq_printf(s, "# |      |         |          |\n\n");
+       seq_printf(s, "# |      |         |          |\n");
        return 0;
 }