tracing: Add a seq_buf_clear() helper and clear len and readpos in init

Add a helper function seq_buf_clear() that resets the len and readpos
fields of a seq_buf. Currently it is only used in the seq_buf_init()
but will be used later when updating the seq_file code.

Link: http://lkml.kernel.org/r/20141104160222.352309995@goodmis.org
Tested-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index d14dc9023ddeb6e063b5334f169be6fd683a8e92..5d91262433e2f685e05eba9b21d74e6a5560d782 100644 (file)
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -22,13 +22,18 @@ struct seq_buf {
        loff_t                  readpos;
 };
 
+static inline void seq_buf_clear(struct seq_buf *s)
+{
+       s->len = 0;
+       s->readpos = 0;
+}
+
 static inline void
 seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
 {
        s->buffer = buf;
        s->size = size;
-       s->len = 0;
-       s->readpos = 0;
+       seq_buf_clear(s);
 }
 
 /*