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

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Date:   Tue, 29 Aug 2017 10:10:34 -0700
From:   Joe Perches <joe@...ches.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Pavel Machek <pavel@....cz>
Cc:     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 Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: printk: what is going on with additional newlines?

On Tue, 2017-08-29 at 09:48 -0700, Linus Torvalds wrote:
> On Mon, Aug 28, 2017 at 2:05 AM, Pavel Machek <pavel@....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.