[RFC,4/8] seq_buf: Add seq_buf_clear_buf()

[Borislav Petkov <bp@alien8.de>]

From: Borislav Petkov <bp@suse.de>

This is the version which clears the supplied buffer too. Useful when
we're done with the buffer and want to clean it up and prepare it for
reuse.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
 include/linux/seq_buf.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index fb7eb9ccb1cd..8705a482e76c 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -28,6 +28,13 @@ static inline void seq_buf_clear(struct seq_buf *s)
 	s->readpos = 0;
 }
 
+/* Like seq_buf_clear() but zero out the buffer too. */
+static inline void seq_buf_clear_buf(struct seq_buf *s)
+{
+	seq_buf_clear(s);
+	memset(s->buffer, 0, s->size);
+}
+
 static inline void
 seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
 {