linux-kernel - [PATCH v2] printk: git rid of [sched_delayed] message for printk

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Date:	Wed, 24 Sep 2014 13:11:44 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Jan Kara <jack@...e.cz>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2] printk: git rid of [sched_delayed] message for
 printk_deferred

commit 458df9fd hardcodes printk_deferred() to KERN_WARNING and inserts
the string "[sched_delayed] " before the actual message.
However it doesn't take into account the KERN_* prefix of the message,
that now ends up in the middle of the output:

 [sched_delayed] ^a4CE: hpet increased min_delta_ns to 20115 nsec

Fix this by just getting rid of the "[sched_delayed] " scnprintf().
This is a safe, because messages get inserted in the kernel ring buffer
immediately these days. So there is no big difference between printk()
and printk_deferred() anymore.

Acked-by: Jan Kara <jack@...e.cz>
Acked-by: Steven Rostedt <rostedt@...dmis.org> 
Signed-off-by: Markus Trippelsdorf <markus@...ppelsdorf.de>

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 1ce770687ea8..f85994b58934 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1680,12 +1680,7 @@ asmlinkage int vprintk_emit(int facility, int level,
 	 * The printf needs to come first; we need the syslog
 	 * prefix which might be passed-in as a parameter.
 	 */
-	if (in_sched)
-		text_len = scnprintf(text, sizeof(textbuf),
-				     KERN_WARNING "[sched_delayed] ");
-
-	text_len += vscnprintf(text + text_len,
-			       sizeof(textbuf) - text_len, fmt, args);
+	text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
 
 	/* mark and strip a trailing newline */
 	if (text_len && text[text_len-1] == '\n') {
-- 
Markus
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