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

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Date:   Sun, 03 Sep 2017 22:41:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Pavel Machek <pavel@....cz>, Petr Mladek <pmladek@...e.com>,
        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>
Subject: Re: printk: what is going on with additional newlines?

On Mon, 2017-09-04 at 14:22 +0900, Sergey Senozhatsky wrote:
> there is only way to serialize printks against other printks -- take
> the logbuf lock.

If that's really necessary, instead make that
logbuf_lock a public interface and keep the rest
of the code simple.

I think it's more important to get printk to work
reliably than keep expanding the number of lines
possible to buffer.