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Subject: Re: printk: what is going on with additional newlines?
From: Joe Perches <joe@perches.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
        Pavel Machek <pavel@ucw.cz>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Petr Mladek <pmladek@suse.com>, Steven Rostedt <rostedt@goodmis.org>,
        Jan Kara <jack@suse.cz>, Andrew Morton <akpm@linux-foundation.org>,
        Jiri Slaby <jslaby@suse.com>, Andreas Mohr <andi@lisas.de>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Date: Tue, 29 Aug 2017 10:10:34 -0700
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On Tue, 2017-08-29 at 09:48 -0700, Linus Torvalds wrote:
> On Mon, Aug 28, 2017 at 2:05 AM, Pavel Machek <pavel@ucw.cz> wrote:
> > Hi!
> > 
> > In 4.13-rc, printk("foo"); printk("bar"); seems to produce
> > foo\nbar. That's... quite surprising/unwelcome. What is going on
> > there? Are timestamps responsible?
> 
> No.
> 
> It's actively trying to treach you not to do shit.
> 
> If you want to continue a line, you NEED to use KERN_CONT.
> 
> That has always been true. It hasn't always been enforced, though.

That's simply false.

It was never true until you made it a requirement.
(it's not a bad requirement, but it did change behavior)

It was just unfortunate there were( and still are)
many cases that needed updating.