linux-kernel - [PATCH] printk: drop redundant devkmsg_log

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Date:   Fri, 19 Jan 2018 13:39:01 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH] printk: drop redundant devkmsg_log_str memsets

We copy in null terminated strings "on" and "off", no
need to zero out devkmsg_log_str in control_devkmsg().

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 kernel/printk/printk.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index d70927c384f3..9faddcfd3994 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -136,13 +136,10 @@ static int __init control_devkmsg(char *str)
 	/*
 	 * Set sysctl string accordingly:
 	 */
-	if (devkmsg_log == DEVKMSG_LOG_MASK_ON) {
-		memset(devkmsg_log_str, 0, DEVKMSG_STR_MAX_SIZE);
-		strncpy(devkmsg_log_str, "on", 2);
-	} else if (devkmsg_log == DEVKMSG_LOG_MASK_OFF) {
-		memset(devkmsg_log_str, 0, DEVKMSG_STR_MAX_SIZE);
-		strncpy(devkmsg_log_str, "off", 3);
-	}
+	if (devkmsg_log == DEVKMSG_LOG_MASK_ON)
+		strcpy(devkmsg_log_str, "on");
+	else if (devkmsg_log == DEVKMSG_LOG_MASK_OFF)
+		strcpy(devkmsg_log_str, "off");
 	/* else "ratelimit" which is set by default. */
 
 	/*
-- 
2.16.0