linux-kernel - Re: printk: what is going on with additional newlines?

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Date:   Mon, 28 Aug 2017 21:38:26 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Pavel Machek <pavel@....cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>, Jan Kara <jack@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jiri Slaby <jslaby@...e.com>, Andreas Mohr <andi@...as.de>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        linux-kernel@...r.kernel.org
Subject: Re: printk: what is going on with additional newlines?

On (08/28/17 21:21), Sergey Senozhatsky wrote:
> how about something like this?
> 

...ok, definetely breaks the

	KERN_ERR "foo"; KERN_CONT "bar"; KERN_CONT "bar"; KERN_CONT "\n";

case. um... something like this then?

---

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index fc47863f629c..098e280e9fe0 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1670,10 +1670,11 @@ static size_t log_output(int facility, int level, enum log_flags lflags, const c
 	 * write from the same process, try to add it to the buffer.
 	 */
 	if (cont.len) {
-		if (cont.owner == current && (lflags & LOG_CONT)) {
+		if (cont.owner == current &&
+				((cont.level == level) ||
+				(lflags & LOG_CONT)))
 			if (cont_add(facility, level, lflags, text, text_len))
 				return text_len;
-		}
 		/* Otherwise, make sure it's flushed */
 		cont_flush();
 	}