linux-kernel - [RFC PATCH 4/8] seq_buf: Add seq_buf_clear

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Message-Id: <20170725154601.27427-5-bp@alien8.de>
Date:   Tue, 25 Jul 2017 17:45:57 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     linux-edac <linux-edac@...r.kernel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Tony Luck <tony.luck@...el.com>,
        Yazen Ghannam <Yazen.Ghannam@....com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 4/8] seq_buf: Add seq_buf_clear_buf()

From: Borislav Petkov <bp@...e.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@...e.de>
Cc: Steven Rostedt <rostedt@...dmis.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)
 {
-- 
2.14.0.rc0