tracing: Use pr_warn_once instead of open coded implementation

Use pr_warn_once, instead of making an open coded implementation.

Link: http://lkml.kernel.org/r/513D8419.20400@huawei.com
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 7f0e7fa6d62cf7c9d1f04cd818968f0454e2707a..bba1ba958ee8dfc235e7015c6833dc5f26969485 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5205,8 +5205,6 @@ static inline int register_snapshot_cmd(void) { return 0; }
 
 struct dentry *tracing_init_dentry_tr(struct trace_array *tr)
 {
-       static int once;
-
        if (tr->dir)
                return tr->dir;
 
@@ -5216,11 +5214,8 @@ struct dentry *tracing_init_dentry_tr(struct trace_array *tr)
        if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
                tr->dir = debugfs_create_dir("tracing", NULL);
 
-       if (!tr->dir && !once) {
-               once = 1;
-               pr_warning("Could not create debugfs directory 'tracing'\n");
-               return NULL;
-       }
+       if (!tr->dir)
+               pr_warn_once("Could not create debugfs directory 'tracing'\n");
 
        return tr->dir;
 }