linux-kernel - [PATCH v2 04/17] tracing: Add a seq_buf_clear() helper and clear len and readpos in init

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Date:	Tue, 19 May 2015 09:08:49 +0000
From:	Wang Long <long.wanglong@...wei.com>
To:	<rostedt@...dmis.org>, <jkosina@...e.cz>, <pmladek@...e.cz>,
	<gregkh@...uxfoundation.org>
CC:	<stable@...r.kernel.org>, <wanglong@...qinren.net>,
	<peifeiyue@...wei.com>, <linux-kernel@...r.kernel.org>,
	<paulmck@...ux.vnet.ibm.com>, <dzickus@...hat.com>,
	<x86@...nel.org>, <long.wanglong@...wei.com>,
	<morgan.wang@...wei.com>, <sasha.levin@...cle.com>
Subject: [PATCH v2 04/17] tracing: Add a seq_buf_clear() helper and clear len and readpos in init

From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>

commit 0736c033a81547b1cdc5120fc8dd60e26a00fd28 upstream.

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@...e.cz>
Acked-by: Jiri Kosina <jkosina@...e.cz>
Reviewed-by: Petr Mladek <pmladek@...e.cz>
[wanglong: backport to 3.10 stable]
Signed-off-by: Wang Long <long.wanglong@...wei.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 include/linux/seq_buf.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index d14dc90..5d91262 100644
--- 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);
 }
 
 /*
-- 
1.8.3.4

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